spapr: Simplify error handling in do_client_architecture_support()

Use the return value of ppc_set_compat_all() to check failures,
which is preferred over hijacking local_err.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20200914123505.612812-7-groug@kaod.org>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

spapr: Get rid of cas_check_pvr() error reporting

The cas_check_pvr() function has two purposes:
- finding the "best" logical PVR, ie. the most recent one supported by
  the guest for this CPU type
- checking if the guest supports the real PVR of this CPU type, which
  is just an optional extra information to workaround the lack of
  support for "compat" mode in PR KVM

This logic doesn't need error reporting, really. If we don't find a
suitable logical PVR, we return the special value 0 which is definitely
not a valid PVR. Let the caller decide on whether it should error out
or not.

This doesn't change the behavior.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20200914123505.612812-6-groug@kaod.org>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

spapr: Simplify error handling in callers of ppc_set_compat()

Now that ppc_set_compat() indicates success/failure with a return
value, use it and reduce error propagation overhead.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20200914123505.612812-5-groug@kaod.org>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

ppc: Fix return value in cpu_post_load() error path

VMState handlers are supposed to return negative errno values on failure.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20200914123505.612812-4-groug@kaod.org>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

ppc: Add a return value to ppc_set_compat() and ppc_set_compat_all()

As recommended in "qapi/error.h", indicate success / failure with a
return value. Since ppc_set_compat() is called from a VMState handler,
let's make it an int so that it propagates any negative errno returned
by kvmppc_set_compat(). Do the same for ppc_set_compat_all() for
consistency, even if it isn't called in a context where a negative errno
is required on failure.

This will allow to simplify error handling in the callers.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20200914123505.612812-3-groug@kaod.org>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

spapr: Fix error leak in spapr_realize_vcpu()

If spapr_irq_cpu_intc_create() fails, local_err isn't propagated and
thus leaked.

Fixes: 992861fb1e4c ("error: Eliminate error_propagate() manually")
Cc: armbru@redhat.com
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20200914123505.612812-2-groug@kaod.org>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

spapr: Handle HPT allocation failure in nested guest

The nested KVM code does not yet support HPT guests. Calling the
KVM_CAP_PPC_ALLOC_HTAB ioctl currently leads to KVM setting the guest
as HPT and erroneously executing code in L1 that should only run in
hypervisor mode, leading to an exception in the L1 vcpu thread when it
enters the nested guest.

This can be reproduced with -machine max-cpu-compat=power8 in the L2
guest command line.

The KVM code has since been modified to fail the ioctl when running in
a nested environment so QEMU needs to be able to handle that. This
patch provides an error message informing the user about the lack of
support for HPT in nested guests.

Reported-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Message-Id: <20200911043123.204162-1-farosas@linux.ibm.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20201008-1' into staging

target-arm queue:
 * hw/ssi/npcm7xx_fiu: Fix handling of unsigned integer
 * hw/arm/fsl-imx25: Fix a typo
 * hw/arm/sbsa-ref : Fix SMMUv3 Initialisation
 * hw/arm/sbsa-ref : allocate IRQs for SMMUv3
 * hw/char/bcm2835_aux: Allow less than 32-bit accesses
 * hw/arm/virt: Implement kvm-steal-time
 * target/arm: Make '-cpu max' have a 48-bit PA

# gpg: Signature made Thu 08 Oct 2020 21:40:31 BST
# gpg:                using RSA key E1A5C593CD419DE28E8315CF3C2525ED14360CDE
# gpg:                issuer "peter.maydell@linaro.org"
# gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>" [ultimate]
# gpg:                 aka "Peter Maydell <pmaydell@gmail.com>" [ultimate]
# gpg:                 aka "Peter Maydell <pmaydell@chiark.greenend.org.uk>" [ultimate]
# Primary key fingerprint: E1A5 C593 CD41 9DE2 8E83  15CF 3C25 25ED 1436 0CDE

* remotes/pmaydell/tags/pull-target-arm-20201008-1:
  target/arm: Make '-cpu max' have a 48-bit PA
  hw/arm/virt: Implement kvm-steal-time
  tests/qtest: Restore aarch64 arm-cpu-features test
  hw/arm/virt: Move kvm pmu setup to virt_cpu_post_init
  hw/arm/virt: Move post cpu realize check into its own function
  target/arm/kvm: Make uncalled stubs explicitly unreachable
  linux headers: sync to 5.9-rc7
  hw/char/bcm2835_aux: Allow less than 32-bit accesses
  hw/arm/sbsa-ref : allocate IRQs for SMMUv3
  hw/arm/sbsa-ref : Fix SMMUv3 Initialisation
  hw/arm/fsl-imx25: Fix a typo
  hw/ssi/npcm7xx_fiu: Fix handling of unsigned integer

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm: Make '-cpu max' have a 48-bit PA

QEMU supports a 48-bit physical address range, but we don't currently
expose it in the '-cpu max' ID registers (you get the same range as
Cortex-A57, which is 44 bits).

Set the ID_AA64MMFR0.PARange field to indicate 48 bits.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20201001160116.18095-1-peter.maydell@linaro.org

Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20201008' into staging

Extend maximum gvec vector size
Fix i386 avx2 dupi
Fix mips host user-only write detection
Misc cleanups.

# gpg: Signature made Thu 08 Oct 2020 13:55:22 BST
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full]
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-tcg-20201008:
  accel/tcg: Fix computing of is_write for MIPS
  tcg: Remove TCG_TARGET_HAS_cmp_vec
  tcg/optimize: Fold dup2_vec
  tcg: Fix generation of dupi_vec for 32-bit host
  tcg/i386: Fix dupi for avx2 32-bit hosts
  tcg: Remove TCGOpDef.used
  tcg: Move some TCG_CT_* bits to TCGArgConstraint bitfields
  tcg: Remove TCG_CT_REG
  tcg: Move sorted_args into TCGArgConstraint.sort_index
  tcg: Drop union from TCGArgConstraint
  tcg: Adjust simd_desc size encoding

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/virt: Implement kvm-steal-time

We add the kvm-steal-time CPU property and implement it for machvirt.
A tiny bit of refactoring was also done to allow pmu and pvtime to
use the same vcpu device helper functions.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Message-id: 20201001061718.101915-7-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

tests/qtest: Restore aarch64 arm-cpu-features test

arm-cpu-features got dropped from the AArch64 tests during the meson
conversion shuffle.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Message-id: 20201001061718.101915-6-drjones@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/virt: Move kvm pmu setup to virt_cpu_post_init

Move the KVM PMU setup part of fdt_add_pmu_nodes() to
virt_cpu_post_init(), which is a more appropriate location. Now
fdt_add_pmu_nodes() is also named more appropriately, because it
no longer does anything but fdt node creation.

No functional change intended.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Message-id: 20201001061718.101915-5-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/virt: Move post cpu realize check into its own function

We'll add more to this new function in coming patches so we also
state the gic must be created and call it below create_gic().

No functional change intended.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Message-id: 20201001061718.101915-4-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm/kvm: Make uncalled stubs explicitly unreachable

When we compile without KVM support !defined(CONFIG_KVM) we generate
stubs for functions that the linker will still encounter. Sometimes
these stubs can be executed safely and are placed in paths where they
get executed with or without KVM. Other functions should never be
called without KVM. Those functions should be guarded by kvm_enabled(),
but should also be robust to refactoring mistakes. Putting a
g_assert_not_reached() in the function should help. Additionally,
the g_assert_not_reached() calls may actually help the linker remove
some code.

We remove the stubs for kvm_arm_get/put_virtual_time(), as they aren't
necessary at all - the only caller is in kvm.c

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Message-id: 20201001061718.101915-3-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

linux headers: sync to 5.9-rc7

Update against Linux 5.9-rc7.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Message-id: 20201001061718.101915-2-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/char/bcm2835_aux: Allow less than 32-bit accesses

The "BCM2835 ARM Peripherals" datasheet [*] chapter 2
("Auxiliaries: UART1 & SPI1, SPI2"), list the register
sizes as 3/8/16/32 bits. We assume this means this
peripheral allows 8-bit accesses.

This was not an issue until commit 5d971f9e67 which reverted
("memory: accept mismatching sizes in memory_region_access_valid").

The model is implemented as 32-bit accesses (see commit 97398d900c,
all registers are 32-bit) so replace MemoryRegionOps.valid as
MemoryRegionOps.impl, and re-introduce MemoryRegionOps.valid
with a 8/32-bit range.

[*] https://www.raspberrypi.org/app/uploads/2012/02/BCM2835-ARM-Peripherals.pdf

Fixes: 97398d900c ("bcm2835_aux: add emulation of BCM2835 AUX (aka UART1) block")
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20201002181032.1899463-1-f4bug@amsat.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/sbsa-ref : allocate IRQs for SMMUv3

Original commit did not allocate IRQs for the SMMUv3 in the irqmap
effectively using irq 0->3 (shared with other devices). Assuming
original intent was to allocate unique IRQs then add an allocation
to the irqmap.

Fixes: e9fdf453240 ("hw/arm: Add arm SBSA reference machine, devices part")
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Graeme Gregory <graeme@nuviainc.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-id: 20201007100732.4103790-3-graeme@nuviainc.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/sbsa-ref : Fix SMMUv3 Initialisation

SMMUv3 has an error in a previous patch where an i was transposed to a 1
meaning interrupts would not have been correctly assigned to the SMMUv3
instance.

Fixes: 48ba18e6d3f3 ("hw/arm/sbsa-ref: Simplify by moving the gic in the machine state")
Signed-off-by: Graeme Gregory <graeme@nuviainc.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-id: 20201007100732.4103790-2-graeme@nuviainc.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/fsl-imx25: Fix a typo

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20201002080935.1660005-1-f4bug@amsat.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/ssi/npcm7xx_fiu: Fix handling of unsigned integer

Fix integer handling issues handling issue reported by Coverity:

  hw/ssi/npcm7xx_fiu.c: 162 in npcm7xx_fiu_flash_read()
  >>>     CID 1432730:  Integer handling issues  (NEGATIVE_RETURNS)
  >>>     "npcm7xx_fiu_cs_index(fiu, f)" is passed to a parameter that cannot be negative.
  162         npcm7xx_fiu_select(fiu, npcm7xx_fiu_cs_index(fiu, f));

  hw/ssi/npcm7xx_fiu.c: 221 in npcm7xx_fiu_flash_write()
  218         cs_id = npcm7xx_fiu_cs_index(fiu, f);
  219         trace_npcm7xx_fiu_flash_write(DEVICE(fiu)->canonical_path, cs_id, addr,
  220                                       size, v);
  >>>     CID 1432729:  Integer handling issues  (NEGATIVE_RETURNS)
  >>>     "cs_id" is passed to a parameter that cannot be negative.
  221         npcm7xx_fiu_select(fiu, cs_id);

Since the index of the flash can not be negative, return an
unsigned type.

Reported-by: Coverity (CID 1432729 & 1432730: NEGATIVE_RETURNS)
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Havard Skinnemoen <hskinnemoen@google.com>
Message-id: 20200919132435.310527-1-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

accel/tcg: Fix computing of is_write for MIPS

Detect all MIPS store instructions in cpu_signal_handler for all available
MIPS versions, and set is_write if encountering such store instructions.

This fixed the error while dealing with self-modified code for MIPS.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Kele Huang <kele.hwang@gmail.com>
Signed-off-by: Xu Zou <iwatchnima@gmail.com>
Message-Id: <20201002081420.10814-1-kele.hwang@gmail.com>
[rth: Use uintptr_t for pc to fix n32 build error.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg: Remove TCG_TARGET_HAS_cmp_vec

The cmp_vec opcode is mandatory; this symbol is unused.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/optimize: Fold dup2_vec

When the two arguments are identical, this can be reduced to
dup_vec or to mov_vec from a tcg_constant_vec.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg: Fix generation of dupi_vec for 32-bit host

The definition of INDEX_op_dupi_vec is that it operates on
units of tcg_target_ulong -- in this case 32 bits.  It does
not work to use this for a uint64_t value that happens to be
small enough to fit in tcg_target_ulong.

Fixes: d2fd745fe8b
Fixes: db432672dc5
Cc: qemu-stable@nongnu.org
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/i386: Fix dupi for avx2 32-bit hosts

The previous change wrongly stated that 32-bit avx2 should have
used VPBROADCASTW.  But that's a 16-bit broadcast and we want a
32-bit broadcast.

Fixes: 7b60ef3264e
Cc: qemu-stable@nongnu.org
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg: Remove TCGOpDef.used

The last user of this field disappeared in f69d277ece4.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg: Move some TCG_CT_* bits to TCGArgConstraint bitfields

These are easier to set and test when they have their own fields.
Reduce the size of alias_index and sort_index to 4 bits, which is
sufficient for TCG_MAX_OP_ARGS.  This leaves only the bits indicating
constants within the ct field.

Move all initialization to allocation time, rather than init
individual fields in process_op_defs.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg: Remove TCG_CT_REG

This wasn't actually used for anything, really.  All variable
operands must accept registers, and which are indicated by the
set in TCGArgConstraint.regs.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg: Move sorted_args into TCGArgConstraint.sort_index

This uses an existing hole in the TCGArgConstraint structure
and will be convenient for keeping the data in one place.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg: Drop union from TCGArgConstraint

The union is unused; let "regs" appear in the main structure
without the "u.regs" wrapping.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg: Adjust simd_desc size encoding

With larger vector sizes, it turns out oprsz == maxsz, and we only
need to represent mismatch for oprsz <= 32.  We do, however, need
to represent larger oprsz and do so without reducing SIMD_DATA_BITS.

Reduce the size of the oprsz field and increase the maxsz field.
Steal the oprsz value of 24 to indicate equality with maxsz.

Tested-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Merge remote-tracking branch 'remotes/ehabkost/tags/machine-next-pull-request' into staging

machine + QOM queue, 2020-10-06

* QOM documentation fixes and cleanups (Eduardo Habkost)
* user-mode: Prune build dependencies (Philippe Mathieu-Daudé)
* qom: Improve error message (Philippe Mathieu-Daudé)
* numa: hmat: require parent cache description before the next
  level one (Igor Mammedov)

# gpg: Signature made Tue 06 Oct 2020 23:09:03 BST
# gpg:                using RSA key 5A322FD5ABC4D3DBACCFD1AA2807936F984DC5A6
# gpg:                issuer "ehabkost@redhat.com"
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>" [full]
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF  D1AA 2807 936F 984D C5A6

* remotes/ehabkost/tags/machine-next-pull-request: (21 commits)
  numa: hmat: require parent cache description before the next level one
  kernel-doc: Remove $decl_type='type name' hack
  memory: Explicitly tag doc comments for structs
  qom: Explicitly tag doc comments for typedefs and structs
  kernel-doc: Handle function typedefs without asterisks
  kernel-doc: Handle function typedefs that return pointers
  docs/devel/qom: Avoid long lines
  docs/devel/qom: Remove usage of <code>
  docs/devel/qom: Use *emphasis* for emphasis
  docs/devel/qom: Fix indentation of code blocks
  docs/devel/qom: Fix indentation of bulleted list
  qom: Fix DECLARE_*CHECKER documentation
  qom: Improve error message displayed with missing object properties
  hw/core/cpu: Add missing 'exec/cpu-common.h' include
  hw/core/qdev-properties: Extract system-mode specific properties
  hw/core/qdev-properties: Export some integer-related functions
  hw/core/qdev-properties: Export qdev_prop_enum
  hw/core/qdev-properties: Export enum-related functions
  hw/core/qdev-properties: Fix code style
  hw/core/qdev-properties: Use qemu_strtoul() in set_pci_host_devaddr()
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Merge remote-tracking branch 'remotes/huth-gitlab/tags/pull-request-2020-10-06' into staging

* Don't stop at the first unbootable device, continue scanning
* Fix corner cases in booting from ECKD
* s390x-ccw bios cleanup part 2​

# gpg: Signature made Tue 06 Oct 2020 19:17:46 BST
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3  EAB9 2ED9 D774 FE70 2DB5

* remotes/huth-gitlab/tags/pull-request-2020-10-06:
  tests/qtest/cdrom: Add more s390x-related boot tests
  pc-bios/s390: Update the s390-ccw bios binaries
  pc-bios: s390x: Go into disabled wait when encountering a PGM exception
  pc-bios: s390x: Use reset PSW if avaliable
  pc-bios: s390x: Save PSW rework
  pc-bios: s390x: Fix bootmap.c zipl component entry data handling
  pc-bios/s390-ccw: break loop if a null block number is reached
  pc-bios/s390-ccw: fix off-by-one error
  pc-bios/s390-ccw/main: Remove superfluous call to enable_subchannel()
  pc-bios/s390-ccw: Allow booting in case the first virtio-blk disk is bad
  pc-bios/s390-ccw: Scan through all devices if no boot device specified
  pc-bios/s390-ccw: Do not bail out early if not finding a SCSI disk
  pc-bios/s390-ccw: Move the inner logic of find_subch() to a separate function
  pc-bios/s390-ccw: Introduce ENODEV define and remove guards of others
  pc-bios/s390-ccw: Move ipl-related code from main() into a separate function
  pc-bios/s390-ccw/Makefile: Compile with -std=gnu99, -fwrapv and -fno-common

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

tests/qtest/cdrom: Add more s390x-related boot tests

Let's add two new tests:

1) Booting with "bootindex" is the architected default behavior on the
s390x target, so we should have at least one test that is using the
"bootindex" property.

2) The s390-ccw bios used to fail when other unbootable devices have
been specified before the bootable device (without "bootindex"). Now
that the s390-ccw bios is a little bit smarter here, we should test
this scenario, too, to avoid regressions.

Message-Id: <20200806105349.632-10-thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios/s390: Update the s390-ccw bios binaries

Make sure that the binaries match the current state of the sources.

Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios: s390x: Go into disabled wait when encountering a PGM exception

Let's setup a PGM PSW, so we won't load 0s when a program exception
happens. Instead we'll load a disabled wait PSW.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20201006094249.50640-5-frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios: s390x: Use reset PSW if avaliable

If a blob provides a reset PSW then we should use it instead of
branching to the PSW address and using our own mask.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20201006094249.50640-4-frankja@linux.ibm.com>
[thuth: Use Elvis operator to shorten long line]
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios: s390x: Save PSW rework

We don't need to save the ipl_continue variable in lowcore and have it
limited to 32 bits because of the lowcore layout. Let's move it to a
new 64 bit variable and get rid of the reset info struct.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20201006094249.50640-3-frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios: s390x: Fix bootmap.c zipl component entry data handling

The two main types of zipl component entries are execute and
load/data. The last member of the component entry struct therefore
denotes either a PSW or an address. Let's make this a bit more clear
by introducing a union and cleaning up the code that uses that struct
member.

The execute type component entries written by zipl contain short PSWs,
not addresses. Let's mask them and only pass the address part to
jump_to_IPL_code(uint64_t address) because it expects an address as
visible by the name of the argument.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20201006094249.50640-2-frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios/s390-ccw: break loop if a null block number is reached

Break the loop if `cur_block_nr` is a null block number because this
means that the end of chunk is reached. In this case we will try to
boot the default entry.

Fixes: ba831b25262a ("s390-ccw: read stage2 boot loader data to find menu")
Reviewed-by: Collin Walling <walling@linux.ibm.com>
Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Message-Id: <20200924085926.21709-3-mhartmay@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios/s390-ccw: fix off-by-one error

This error takes effect when the magic value "zIPL" is located at the
end of a block. For example if s2_cur_blk = 0x7fe18000 and the magic
value "zIPL" is located at 0x7fe18ffc - 0x7fe18fff.

Fixes: ba831b25262a ("s390-ccw: read stage2 boot loader data to find menu")
Reviewed-by: Collin Walling <walling@linux.ibm.com>
Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Message-Id: <20200924085926.21709-2-mhartmay@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
[thuth: Use "<= ... - 4" instead of "< ... - 3"]
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios/s390-ccw/main: Remove superfluous call to enable_subchannel()

enable_subchannel() is already done during is_dev_possibly_bootable()
(which is called from find_boot_device() -> find_subch()), so there
is no need to do this again in the main() function.

Message-Id: <20200806105349.632-9-thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios/s390-ccw: Allow booting in case the first virtio-blk disk is bad

If you try to boot with two virtio-blk disks (without bootindex), and
only the second one is bootable, the s390-ccw bios currently stops at
the first disk and does not continue booting from the second one. This
is annoying - and all other major QEMU firmwares succeed to boot from
the second disk in this case, so we should do the same in the s390-ccw
bios, too.

Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200806105349.632-8-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios/s390-ccw: Scan through all devices if no boot device specified

If no boot device has been specified (via "bootindex=..."), the s390-ccw
bios scans through all devices to find a bootable device. But so far, it
stops at the very first block device (including virtio-scsi controllers
without attached devices) that it finds, no matter whether it is bootable
or not. That leads to some weird situatation where it is e.g. possible
to boot via:

 qemu-system-s390x -hda /path/to/disk.qcow2

but not if there is e.g. a virtio-scsi controller specified before:

 qemu-system-s390x -device virtio-scsi -hda /path/to/disk.qcow2

While using "bootindex=..." is clearly the preferred way of booting
on s390x, we still can make the life for the users at least a little
bit easier if we look at all available devices to find a bootable one.

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1846975
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200806105349.632-7-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios/s390-ccw: Do not bail out early if not finding a SCSI disk

In case the user did not specify a boot device, we want to continue
looking for other devices if there are no valid SCSI disks on a virtio-
scsi controller. As a first step, do not panic in this case and let
the control flow carry the error to the upper functions instead.

Message-Id: <20200806105349.632-6-thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios/s390-ccw: Move the inner logic of find_subch() to a separate function

Move the code to a separate function to be able to re-use it from a
different spot later.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-Id: <20200806105349.632-5-thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios/s390-ccw: Introduce ENODEV define and remove guards of others

Remove the "#ifndef E..." guards from the defines here - the header
guard S390_CCW_H at the top of the file should avoid double definition,
and if the error code is defined in a different file already, we're in
trouble anyway, then it's better to see the error at compile time instead
of hunting weird behavior during runtime later.
Also define ENODEV - we will use this in a later patch.

Message-Id: <20200806105349.632-4-thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios/s390-ccw: Move ipl-related code from main() into a separate function

Let's move this part of the code into a separate function to be able
to use it from multiple spots later.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Message-Id: <20200806105349.632-3-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios/s390-ccw/Makefile: Compile with -std=gnu99, -fwrapv and -fno-common

The main QEMU code is compiled with -std=gnu99, -fwrapv and -fno-common.
We should use the same flags for the s390-ccw bios, too, to avoid that
we get different behavior with different compiler versions that changed
their default settings in the course of time (it happened at least with
-std=... and -fno-common in the past already).

While we're at it, also group the other flags here in a little bit nicer
fashion: Move the two "-m" flags out of the "-f" area and specify them on
a separate line.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Message-Id: <20200806105349.632-2-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

numa: hmat: require parent cache description before the next level one

Spec[1] defines 0 - 3 level memory side cache, however QEMU
CLI allows to specify an intermediate cache level without
specifying previous level. Such option(s) silently ignored
when building HMAT table, which leads to incomplete cache
information.
Make sure that previous level exists and error out
if it hasn't been provided.

1) ACPI 6.2A 5.2.27.5 Memory Side Cache Information Structure

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1842877
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20201006150002.1601845-1-imammedo@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

kernel-doc: Remove $decl_type='type name' hack

The $decl_type='type name' hack makes it impossible to document
macros with uppercase names (e.g. most of the macros in
object.h).

Now that we have explicitly tagged the struct and typedef doc
comments in memory.h and object.h, we don't need that hack
anymore.  This will make the documentation for the macros in
object.h finally be rendered as expected.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201003024123.193840-6-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

memory: Explicitly tag doc comments for structs

This will allow us to remove the QEMU-specific
$decl_type='type name' hack from the kernel-doc script.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201003024123.193840-5-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

qom: Explicitly tag doc comments for typedefs and structs

If we explicitly indicate we are documenting a typedef or a
struct, we'll be able to remove the $decl_type='type name' hack
from kernel-doc.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201003024123.193840-4-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

kernel-doc: Handle function typedefs without asterisks

Example of typedef that was not parsed by kernel-doc:

  typedef void (ObjectUnparent)(Object *obj);

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201003024123.193840-3-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

kernel-doc: Handle function typedefs that return pointers

One example that was not being parsed correctly by kernel-doc is:

  typedef Object *(ObjectPropertyResolve)(Object *obj,
                                          void *opaque,
                                          const char *part);

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201003024123.193840-2-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

docs/devel/qom: Avoid long lines

Long code lines don't look good in the rendered documents, make
them shorter.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201003025424.199291-7-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

docs/devel/qom: Remove usage of <code>

<code> is not valid reST syntax.

Function @argument references don't need additional markup, so
just remove <code></code>.

Constants were changed to use reST ``code`` syntax

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201003025424.199291-6-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

docs/devel/qom: Use *emphasis* for emphasis

<emphasis> is not valid reST syntax.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201003025424.199291-5-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

docs/devel/qom: Fix indentation of code blocks

Some code blocks had one extra space, fix that.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201003025424.199291-4-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

docs/devel/qom: Fix indentation of bulleted list

The list was incorrectly parsed as a literal block due to
indentation.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201003025424.199291-3-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

qom: Fix DECLARE_*CHECKER documentation

Correct copy/paste mistake in the DECLARE_INSTANCE_CHECKER and
DECLARE_CLASS_CHECKERS documentation.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201003025424.199291-2-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

qom: Improve error message displayed with missing object properties

Instead of only displaying the property missing, also display
the object name. This help developer to quickly figure out the
mistake without opening a debugger.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200920155340.401482-1-f4bug@amsat.org>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

hw/core/cpu: Add missing 'exec/cpu-common.h' include

cpu_common_reset() uses tcg_flush_softmmu_tlb() which is
declared in "exec/cpu-common.h". Add the missing header
to avoid when refactoring other headers:

  hw/core/cpu.c: In function ‘cpu_common_reset’:
  hw/core/cpu.c:273:9: error: implicit declaration of function ‘tcg_flush_softmmu_tlb’ [-Werror=implicit-function-declaration]
    273 |         tcg_flush_softmmu_tlb(cpu);
        |         ^~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200908123433.105706-1-philmd@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

hw/core/qdev-properties: Extract system-mode specific properties

Move properties specific to machines into a separate file.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200930164949.1425294-9-philmd@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

hw/core/qdev-properties: Export some integer-related functions

We are going to split this file and reuse these static functions.
Declare them in the local "qdev-prop-internal.h" header.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200930164949.1425294-8-philmd@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

hw/core/qdev-properties: Export qdev_prop_enum

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200930164949.1425294-7-philmd@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

hw/core/qdev-properties: Export enum-related functions

We are going to split this file and reuse these static functions.
Add the local "qdev-prop-internal.h" header declaring them.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200930164949.1425294-6-philmd@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

hw/core/qdev-properties: Fix code style

We will soon move this code, fix its style to avoid checkpatch.pl
to complain.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200930164949.1425294-5-philmd@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

hw/core/qdev-properties: Use qemu_strtoul() in set_pci_host_devaddr()

Replace strtoul() by qemu_strtoul() so checkpatch.pl won't complain
if we move this code later.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200930164949.1425294-4-philmd@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

hw/core/qdev-properties: Use qemu_strtol() in set_mac() handler

The MACAddr structure contains an array of uint8_t. Previously
if a value was out of the [0..255] range, it was silently casted
and no input validation was done.
Replace strtol() by qemu_strtol() -- so checkpatch.pl won't
complain if we move this code later -- and return EINVAL if the
input is invalid.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200930164949.1425294-3-philmd@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

Merge remote-tracking branch 'remotes/bonzini-gitlab/tags/for-upstream' into staging

* Reverse debugging (Pavel)
* CFLAGS cleanup (Paolo)
* ASLR fix (Mark)
* cpus.c refactoring (Claudio)

# gpg: Signature made Tue 06 Oct 2020 07:35:09 BST
# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg:                issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* remotes/bonzini-gitlab/tags/for-upstream: (37 commits)
  tests/acceptance: add reverse debugging test
  replay: create temporary snapshot at debugger connection
  replay: describe reverse debugging in docs/replay.txt
  gdbstub: add reverse continue support in replay mode
  gdbstub: add reverse step support in replay mode
  replay: flush rr queue before loading the vmstate
  replay: implement replay-seek command
  replay: introduce breakpoint at the specified step
  replay: introduce info hmp/qmp command
  qapi: introduce replay.json for record/replay-related stuff
  migration: introduce icount field for snapshots
  qcow2: introduce icount field for snapshots
  replay: provide an accessor for rr filename
  replay: don't record interrupt poll
  configure: don't enable ASLR for --enable-debug Windows builds
  configure: consistently pass CFLAGS/CXXFLAGS/LDFLAGS to meson
  configure: do not clobber environment CFLAGS/CXXFLAGS/LDFLAGS
  dtc: Convert Makefile bits to meson bits
  slirp: Convert Makefile bits to meson bits
  accel/tcg: use current_machine as it is always set for softmmu
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Merge remote-tracking branch 'remotes/stefanha-gitlab/tags/block-pull-request' into staging

Pull request

v2:
 * Removed clang-format call from scripts/block-coroutine-wrapper.py. This
   avoids the issue with clang version incompatibility. It could be added back
   in the future but the code is readable without reformatting and it also
   makes the build less dependent on the environment.

# gpg: Signature made Mon 05 Oct 2020 16:42:28 BST
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha-gitlab/tags/block-pull-request:
  util/vfio-helpers: Rework the IOVA allocator to avoid IOVA reserved regions
  util/vfio-helpers: Collect IOVA reserved regions
  docs: add 'io_uring' option to 'aio' param in qemu-options.hx
  include/block/block.h: drop non-ascii quotation mark
  block/io: refactor save/load vmstate
  block: drop bdrv_prwv
  block: generate coroutine-wrapper code
  scripts: add block-coroutine-wrapper.py
  block: declare some coroutine functions in block/coroutines.h
  block/io: refactor coroutine wrappers
  block: return error-code from bdrv_invalidate_cache
  block/nvme: Replace magic value by SCALE_MS definition
  block/nvme: Use register definitions from 'block/nvme.h'
  block/nvme: Drop NVMeRegs structure, directly use NvmeBar
  block/nvme: Reduce I/O registers scope
  block/nvme: Map doorbells pages write-only
  util/vfio-helpers: Pass page protections to qemu_vfio_pci_map_bar()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

tests/acceptance: add reverse debugging test

This is a test for GDB reverse debugging commands: reverse step and reverse continue.
Every test in this suite consists of two phases: record and replay.
Recording saves the execution of some instructions and makes an initial
VM snapshot to allow reverse execution.
Replay saves the order of the first instructions and then checks that they
are executed backwards in the correct order.
After that the execution is replayed to the end, and reverse continue
command is checked by setting several breakpoints, and asserting
that the execution is stopped at the last of them.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
--

v5:
 - disabled (as some other tests) when running on gitlab
   due to the unidentified timeout problem
Message-Id: <160174524678.12451.13258942849173670277.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

replay: create temporary snapshot at debugger connection

When record/replay does not uses overlays for storing the snapshots,
user is not capable of issuing reverse debugging commands.
This patch adds creation of the VM snapshot on the temporary
overlay image, when the debugger connects to QEMU.
Therefore the execution can be rewind to the moment
of the debugger connection while debugging the virtual machine.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
--

v6:
 - dropped unused error processing (suggested by Philippe Mathieu-Daudé)
Message-Id: <160174524096.12451.11651270339216758643.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

replay: describe reverse debugging in docs/replay.txt

This patch updates the documentation and describes usage of the reverse
debugging in QEMU+GDB.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
--

v4 changes:
 - added an example of the command line for reverse debugging of
   the diskless machine
Message-Id: <160174523509.12451.1409905901920738979.stgit@pasha-ThinkPad-X280>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

gdbstub: add reverse continue support in replay mode

This patch adds support of the reverse continue operation for gdbstub.
Reverse continue finds the last breakpoint that would happen in normal
execution from the beginning to the current moment.
Implementation of the reverse continue replays the execution twice:
to find the breakpoints that were hit and to seek to the last breakpoint.
Reverse continue loads the previous snapshot and tries to find the breakpoint
since that moment. If there are no such breakpoints, it proceeds to
the earlier snapshot, and so on. When no breakpoints or watchpoints were
hit at all, execution stops at the beginning of the replay log.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Message-Id: <160174522930.12451.6994758004725016836.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

gdbstub: add reverse step support in replay mode

GDB remote protocol supports two reverse debugging commands:
reverse step and reverse continue.
This patch adds support of the first one to the gdbstub.
Reverse step is intended to step one instruction in the backwards
direction. This is not possible in regular execution.
But replayed execution is deterministic, therefore we can load one of
the prior snapshots and proceed to the desired step. It is equivalent
to stepping one instruction back.
There should be at least one snapshot preceding the debugged part of
the replay log.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
--

v4 changes:
 - inverted condition in cpu_handle_guest_debug (suggested by Alex Bennée)
Message-Id: <160174522341.12451.1498758422543765253.stgit@pasha-ThinkPad-X280>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

replay: flush rr queue before loading the vmstate

Non-empty record/replay queue prevents saving and loading the VM state,
because it includes pending bottom halves and block coroutines.
But when the new VM state is loaded, we don't have to preserve the consistency
of the current state anymore. Therefore this patch just flushes the queue
allowing the coroutines to finish and removes checking for empty rr queue
for load_snapshot function.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <160174521762.12451.15752448887893855757.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

replay: implement replay-seek command

This patch adds hmp/qmp commands replay_seek/replay-seek that proceed
the execution to the specified instruction count.
The command automatically loads nearest snapshot and replays the execution
to find the desired instruction count.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Acked-by: Markus Armbruster <armbru@redhat.com>
--

v4 changes:
 - fixed HMP command description indent
 - removed useless error_free call
Message-Id: <160174521180.12451.14033112911009278753.stgit@pasha-ThinkPad-X280>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

replay: introduce breakpoint at the specified step

This patch introduces replay_break, replay_delete_break
qmp and hmp commands.
These commands allow stopping at the specified instruction.
It may be useful for debugging when there are some known
events that should be investigated.
replay_break command has one argument - number of instructions
executed since the start of the replay.
replay_delete_break removes previously set breakpoint.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Acked-by: Markus Armbruster <armbru@redhat.com>
--

v4 changes:
 - removed useless error_free call
Message-Id: <160174520606.12451.7056879546045599378.stgit@pasha-ThinkPad-X280>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

replay: introduce info hmp/qmp command

This patch introduces 'info replay' monitor command and
corresponding qmp request.
These commands request the current record/replay mode, replay log file
name, and the instruction count (number of recorded/replayed
instructions).  The instruction count can be used with the
replay_seek/replay_break commands added in the next two patches.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <160174520026.12451.13112161947433306561.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

qapi: introduce replay.json for record/replay-related stuff

This patch adds replay.json file. It will be
used for adding record/replay-related data structures and commands.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <160174519444.12451.3472949430004845434.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

migration: introduce icount field for snapshots

Saving icount as a parameters of the snapshot allows navigation between
them in the execution replay scenario.
This information can be used for finding a specific snapshot for proceeding
the recorded execution to the specific moment of the time.
E.g., 'reverse step' action (introduced in one of the following patches)
needs to load the nearest snapshot which is prior to the current moment
of time.
This patch also updates snapshot test which verifies qemu monitor output.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Acked-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
--

v4 changes:
 - squashed format update with test output update
v7 changes:
 - introduced the spaces between the fields in snapshot info output
 - updated the test to match new field widths
Message-Id: <160174518865.12451.14327573383978752463.stgit@pasha-ThinkPad-X280>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

qcow2: introduce icount field for snapshots

This patch introduces the icount field for saving within the snapshot.
It is required for navigation between the snapshots in record/replay mode.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Acked-by: Kevin Wolf <kwolf@redhat.com>
--

v7 changes:
 - also fix the test which checks qcow2 snapshot extra data
Message-Id: <160174518284.12451.2301137308458777398.stgit@pasha-ThinkPad-X280>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

replay: provide an accessor for rr filename

This patch adds an accessor function for the name of the record/replay
log file. Adding an accessor instead of making variable global,
prevents accidental modification of this variable by other modules.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <160174517710.12451.17645787545733927488.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

replay: don't record interrupt poll

Interrupt poll is not a real interrupt event. It is needed only for
thread safety. This interrupt is used for i386 and converted
to hardware interrupt by cpu_handle_interrupt function.
Therefore it is not needed to be recorded, because hardware
interrupt will be recorded after converting.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
--

v4 changes:
 - Condition check refactoring (suggested by Alex Bennée)
Message-Id: <160174517124.12451.12983410242461131737.stgit@pasha-ThinkPad-X280>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure: don't enable ASLR for --enable-debug Windows builds

Unlike other OSs it is not possible for gdb to temporarily disable ASLR when
debugging executables on Windows which causes gdb to fail with memory access
errors when trying to debug QEMU.

Keep ASLR enabled by default on Windows via the --dynamicbase compiler flag
except for --enable-debug builds when there is a clear expectation that a
functioning gdb is expected at the cost of slightly less security.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <20201005133434.12614-1-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure: consistently pass CFLAGS/CXXFLAGS/LDFLAGS to meson

Environment variables like CFLAGS are easy to accidentally change.  Meson
warns if that happens, but in a project with a lot of configuration that
is easy to lose.  It is also surprising behavior since meson caches -D
options and remembers those on reconfiguration (which we rely on,
since configure options become -D options).

By placing the user-provided CFLAGS, CXXFLAGS and LDFLAGS in the
cross file, we at least get consistent behavior.  These environment
variables are still ugly and not really recommended, but there are
distros that rely on them.  For the gory details, refer to
https://github.com/mesonbuild/meson/issues/4664.

Tested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200923092617.1593722-5-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure: do not clobber environment CFLAGS/CXXFLAGS/LDFLAGS

If the CFLAGS, CXXFLAGS or LDFLAGS variables are present in the environment,
any modification made within the configure script is passed down to Meson.
This is particularly undesirable for the "-pie" option, since it overrides
"-shared" and thus messes up the linker flags for shared modules.

Using a separate variable therefore fixes the bug, while clarifying that
the scope of these CFLAGS is just the configure script.

We also do not need to pass those variables in config-host.mak; they
were only used for printing the summary now that all submodules are
built with handwritten Meson rules).  For now synthesize CFLAGS in the
configuration summary, the next patch will also pass them in a cleaner
way using the cross file.

Reported-by: Frederic Bezies
Analyzed-by: Toolybird
Tested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200923092617.1593722-4-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

dtc: Convert Makefile bits to meson bits

Build the library via the main meson.build just like for capstone.
This improves the current state of affairs in that we will re-link
the qemu executables against a changed libfdt.a, which we wouldn't
do before-hand, and lets us remove the whole recursive make machinery.

Tested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

slirp: Convert Makefile bits to meson bits

SLIRP uses Meson so it could become a subproject in the future,
but our choice of configure options is not yet supported in Meson
(https://github.com/mesonbuild/meson/pull/7740).

For now, build the library via the main meson.build just like for
capstone.

This improves the current state of affairs in that we will re-link
the qemu executables against a changed libslirp.a, which we wouldn't
do before-hand.

Tested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

readthedocs: build with Python 3.6

The readthedocs build is failing because we do not support Python 3.5 anymore.
Bump the Python version in the configuration.

Fixes: 1b11f28d05 ("configure: Bump the minimum required Python version to 3.6", 2020-10-02)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20201005150122.446472-1-pbonzini@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

accel/tcg: use current_machine as it is always set for softmmu

current_machine is always set before accelerators are initialized,
so use that instead of MACHINE(qdev_get_machine()).

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

kvm: kvm_init_vcpu take Error pointer

Clean up the error handling in kvm_init_vcpu so we can see what went
wrong more easily.

Make it take an Error ** and fill it out with what failed, including
the cpu id, so you can tell if it only fails at a given ID.

Replace the remaining DPRINTF by a trace.

This turns a:
kvm_init_vcpu failed: Invalid argument

into:
kvm_init_vcpu: kvm_get_vcpu failed (256): Invalid argument

and with the trace you then get to see:

19049@1595520414.310107:kvm_init_vcpu index: 169 id: 212
19050@1595520414.310635:kvm_init_vcpu index: 170 id: 256
qemu-system-x86_64: kvm_init_vcpu: kvm_get_vcpu failed (256): Invalid argument

which makes stuff a lot more obvious.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200723160915.129069-1-dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

kvm: remove kvm specific functions from global includes

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hax: remove hax specific functions from global includes

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

whpx: remove whpx specific functions from global includes

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hvf: remove hvf specific functions from global includes

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

cpus: add handle_interrupt to the CpusAccel interface

kvm: uses the generic handler
qtest: uses the generic handler
whpx: changed to use the generic handler (identical implementation)
hax: changed to use the generic handler (identical implementation)
hvf: changed to use the generic handler (identical implementation)
tcg: adapt tcg-cpus to point to the tcg-specific handler

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>