#include <asm/asm-offsets.h>
#include <asm/asm.h>
#include <asm/frame.h>
-#include <asm/unwind_hints.h>
#include <linux/linkage.h>
-#include <linux/bits.h>
#include <linux/errno.h>
#include "../../virt/vmx/tdx/tdxcall.S"
-/*
- * Bitmasks of exposed registers (with VMM).
- */
-#define TDX_RDX BIT(2)
-#define TDX_RBX BIT(3)
-#define TDX_RSI BIT(6)
-#define TDX_RDI BIT(7)
-#define TDX_R8 BIT(8)
-#define TDX_R9 BIT(9)
-#define TDX_R10 BIT(10)
-#define TDX_R11 BIT(11)
-#define TDX_R12 BIT(12)
-#define TDX_R13 BIT(13)
-#define TDX_R14 BIT(14)
-#define TDX_R15 BIT(15)
-
-/*
- * These registers are clobbered to hold arguments for each
- * TDVMCALL. They are safe to expose to the VMM.
- * Each bit in this mask represents a register ID. Bit field
- * details can be found in TDX GHCI specification, section
- * titled "TDCALL [TDG.VP.VMCALL] leaf".
- */
-#define TDVMCALL_EXPOSE_REGS_MASK \
- ( TDX_RDX | TDX_RBX | TDX_RSI | TDX_RDI | TDX_R8 | TDX_R9 | \
- TDX_R10 | TDX_R11 | TDX_R12 | TDX_R13 | TDX_R14 | TDX_R15 )
-
.section .noinstr.text, "ax"
/*
* TDX_HYPERCALL - Make hypercalls to a TDX VMM using TDVMCALL leaf of TDCALL
* instruction
*
- * Transforms values in function call argument struct tdx_hypercall_args @args
+ * Transforms values in function call argument struct tdx_module_args @args
* into the TDCALL register ABI. After TDCALL operation, VMM output is saved
* back in @args, if \ret is 1.
*
+ * Depends on the caller to pass TDG.VP.VMCALL as the TDCALL leaf, and set
+ * @args::rcx to TDVMCALL_EXPOSE_REGS_MASK.
+ *
*-------------------------------------------------------------------------
* TD VMCALL ABI:
*-------------------------------------------------------------------------
* R8-R15 - Same as above.
*
*/
-.macro TDX_HYPERCALL ret:req
+.macro TDX_HYPERCALL
FRAME_BEGIN
/* Save callee-saved GPRs as mandated by the x86_64 ABI */
push %r12
push %rbx
- /* Free RDI to be used as TDVMCALL arguments */
+ /* Move Leaf ID to RAX */
movq %rdi, %rax
+ /* Move bitmap of shared registers to RCX */
+ movq TDX_MODULE_rcx(%rsi), %rcx
+
/* Copy hypercall registers from arg struct: */
- movq TDX_HYPERCALL_r8(%rax), %r8
- movq TDX_HYPERCALL_r9(%rax), %r9
- movq TDX_HYPERCALL_r10(%rax), %r10
- movq TDX_HYPERCALL_r11(%rax), %r11
- movq TDX_HYPERCALL_r12(%rax), %r12
- movq TDX_HYPERCALL_r13(%rax), %r13
- movq TDX_HYPERCALL_r14(%rax), %r14
- movq TDX_HYPERCALL_r15(%rax), %r15
- movq TDX_HYPERCALL_rdi(%rax), %rdi
- movq TDX_HYPERCALL_rsi(%rax), %rsi
- movq TDX_HYPERCALL_rbx(%rax), %rbx
- movq TDX_HYPERCALL_rdx(%rax), %rdx
-
- push %rax
-
- /* Mangle function call ABI into TDCALL ABI: */
- /* Set TDCALL leaf ID (TDVMCALL (0)) in RAX */
- xor %eax, %eax
-
- movl $TDVMCALL_EXPOSE_REGS_MASK, %ecx
+ movq TDX_MODULE_r8(%rsi), %r8
+ movq TDX_MODULE_r9(%rsi), %r9
+ movq TDX_MODULE_r10(%rsi), %r10
+ movq TDX_MODULE_r11(%rsi), %r11
+ movq TDX_MODULE_r12(%rsi), %r12
+ movq TDX_MODULE_r13(%rsi), %r13
+ movq TDX_MODULE_r14(%rsi), %r14
+ movq TDX_MODULE_r15(%rsi), %r15
+ movq TDX_MODULE_rdi(%rsi), %rdi
+ movq TDX_MODULE_rbx(%rsi), %rbx
+ movq TDX_MODULE_rdx(%rsi), %rdx
+
+ pushq %rsi
+ movq TDX_MODULE_rsi(%rsi), %rsi
tdcall
/*
- * RAX!=0 indicates a failure of the TDVMCALL mechanism itself and that
- * something has gone horribly wrong with the TDX module.
+ * Restore the pointer of the structure to save output registers.
*
- * The return status of the hypercall operation is in a separate
- * register (in R10). Hypercall errors are a part of normal operation
- * and are handled by callers.
+ * RCX is used as bitmap of shared registers and doesn't hold any
+ * value provided by the VMM, thus it can be used as spare to
+ * restore the structure pointer.
*/
- testq %rax, %rax
- jne .Lpanic\@
-
- pop %rax
-
- .if \ret
- movq %r8, TDX_HYPERCALL_r8(%rax)
- movq %r9, TDX_HYPERCALL_r9(%rax)
- movq %r10, TDX_HYPERCALL_r10(%rax)
- movq %r11, TDX_HYPERCALL_r11(%rax)
- movq %r12, TDX_HYPERCALL_r12(%rax)
- movq %r13, TDX_HYPERCALL_r13(%rax)
- movq %r14, TDX_HYPERCALL_r14(%rax)
- movq %r15, TDX_HYPERCALL_r15(%rax)
- movq %rdi, TDX_HYPERCALL_rdi(%rax)
- movq %rsi, TDX_HYPERCALL_rsi(%rax)
- movq %rbx, TDX_HYPERCALL_rbx(%rax)
- movq %rdx, TDX_HYPERCALL_rdx(%rax)
- .endif
-
- /* TDVMCALL leaf return code is in R10 */
- movq %r10, %rax
+ popq %rcx
+ movq %rsi, TDX_MODULE_rsi(%rcx)
+ movq %rcx, %rsi
+
+ movq %r8, TDX_MODULE_r8(%rsi)
+ movq %r9, TDX_MODULE_r9(%rsi)
+ movq %r10, TDX_MODULE_r10(%rsi)
+ movq %r11, TDX_MODULE_r11(%rsi)
+ movq %r12, TDX_MODULE_r12(%rsi)
+ movq %r13, TDX_MODULE_r13(%rsi)
+ movq %r14, TDX_MODULE_r14(%rsi)
+ movq %r15, TDX_MODULE_r15(%rsi)
+ movq %rdi, TDX_MODULE_rdi(%rsi)
+ movq %rbx, TDX_MODULE_rbx(%rsi)
+ movq %rdx, TDX_MODULE_rdx(%rsi)
/*
* Zero out registers exposed to the VMM to avoid speculative execution
FRAME_END
RET
-.Lpanic\@:
- call __tdx_hypercall_failed
- /* __tdx_hypercall_failed never returns */
- REACHABLE
- jmp .Lpanic\@
.endm
/*
*
- * __tdx_hypercall() function ABI:
- *
- * @args (RDI) - struct tdx_hypercall_args for input
- *
- * On successful completion, return the hypercall error code.
- */
-SYM_FUNC_START(__tdx_hypercall)
- TDX_HYPERCALL ret=0
-SYM_FUNC_END(__tdx_hypercall)
-
-/*
+ * __tdcall_hypercall() function ABI:
*
- * __tdx_hypercall_ret() function ABI:
+ * @fn (RDI) - TDCALL leaf ID, moved to RAX
+ * @args (RSI) - struct tdx_module_args for input/output
*
- * @args (RDI) - struct tdx_hypercall_args for input and output
+ * @fn and @args::rcx from the caller must be TDG_VP_VMCALL and
+ * TDVMCALL_EXPOSE_REGS_MASK respectively.
*
* On successful completion, return the hypercall error code.
*/
-SYM_FUNC_START(__tdx_hypercall_ret)
- TDX_HYPERCALL ret=1
-SYM_FUNC_END(__tdx_hypercall_ret)
+SYM_FUNC_START(__tdcall_hypercall)
+ TDX_HYPERCALL
+SYM_FUNC_END(__tdcall_hypercall)
#define TDX_IDENT "IntelTDX "
/* TDX module Call Leaf IDs */
+#define TDG_VP_VMCALL 0
#define TDG_VP_INFO 1
#define TDG_VP_VEINFO_GET 3
#define TDG_MR_REPORT 4
#define TDVMCALL_STATUS_RETRY 1
+/*
+ * Bitmasks of exposed registers (with VMM).
+ */
+#define TDX_RDX BIT(2)
+#define TDX_RBX BIT(3)
+#define TDX_RSI BIT(6)
+#define TDX_RDI BIT(7)
+#define TDX_R8 BIT(8)
+#define TDX_R9 BIT(9)
+#define TDX_R10 BIT(10)
+#define TDX_R11 BIT(11)
+#define TDX_R12 BIT(12)
+#define TDX_R13 BIT(13)
+#define TDX_R14 BIT(14)
+#define TDX_R15 BIT(15)
+
+/*
+ * These registers are clobbered to hold arguments for each
+ * TDVMCALL. They are safe to expose to the VMM.
+ * Each bit in this mask represents a register ID. Bit field
+ * details can be found in TDX GHCI specification, section
+ * titled "TDCALL [TDG.VP.VMCALL] leaf".
+ */
+#define TDVMCALL_EXPOSE_REGS_MASK \
+ (TDX_RDX | TDX_RBX | TDX_RSI | TDX_RDI | TDX_R8 | TDX_R9 | \
+ TDX_R10 | TDX_R11 | TDX_R12 | TDX_R13 | TDX_R14 | TDX_R15)
+
#ifndef __ASSEMBLY__
+/*
+ * Used in __tdcall*() to gather the input/output registers' values of the
+ * TDCALL instruction when requesting services from the TDX module. This is a
+ * software only structure and not part of the TDX module/VMM ABI
+ */
+struct tdx_module_args {
+ /* callee-clobbered */
+ u64 rcx;
+ u64 rdx;
+ u64 r8;
+ u64 r9;
+ /* extra callee-clobbered */
+ u64 r10;
+ u64 r11;
+ /* callee-saved + rdi/rsi */
+ u64 r12;
+ u64 r13;
+ u64 r14;
+ u64 r15;
+ u64 rbx;
+ u64 rdi;
+ u64 rsi;
+};
+
+/* Used to communicate with the TDX module */
+u64 __tdcall(u64 fn, struct tdx_module_args *args);
+u64 __tdcall_ret(u64 fn, struct tdx_module_args *args);
+
/*
* Used in __tdx_hypercall() to pass down and get back registers' values of
* the TDCALL instruction when requesting services from the VMM.
};
/* Used to request services from the VMM */
+u64 __tdcall_hypercall(u64 fn, struct tdx_module_args *args);
u64 __tdx_hypercall(struct tdx_hypercall_args *args);
-u64 __tdx_hypercall_ret(struct tdx_hypercall_args *args);
/*
* Wrapper for standard use of __tdx_hypercall with no output aside from
/* Called from __tdx_hypercall() for unrecoverable failure */
void __tdx_hypercall_failed(void);
-/*
- * Used in __tdcall*() to gather the input/output registers' values of the
- * TDCALL instruction when requesting services from the TDX module. This is a
- * software only structure and not part of the TDX module/VMM ABI
- */
-struct tdx_module_args {
- /* callee-clobbered */
- u64 rcx;
- u64 rdx;
- u64 r8;
- u64 r9;
- /* extra callee-clobbered */
- u64 r10;
- u64 r11;
- /* callee-saved + rdi/rsi */
- u64 r12;
- u64 r13;
- u64 r14;
- u64 r15;
- u64 rbx;
- u64 rdi;
- u64 rsi;
-};
-
-/* Used to communicate with the TDX module */
-u64 __tdcall(u64 fn, struct tdx_module_args *args);
-u64 __tdcall_ret(u64 fn, struct tdx_module_args *args);
-
bool tdx_accept_memory(phys_addr_t start, phys_addr_t end);
/*
OFFSET(TDX_MODULE_rdi, tdx_module_args, rdi);
OFFSET(TDX_MODULE_rsi, tdx_module_args, rsi);
- BLANK();
- OFFSET(TDX_HYPERCALL_r8, tdx_hypercall_args, r8);
- OFFSET(TDX_HYPERCALL_r9, tdx_hypercall_args, r9);
- OFFSET(TDX_HYPERCALL_r10, tdx_hypercall_args, r10);
- OFFSET(TDX_HYPERCALL_r11, tdx_hypercall_args, r11);
- OFFSET(TDX_HYPERCALL_r12, tdx_hypercall_args, r12);
- OFFSET(TDX_HYPERCALL_r13, tdx_hypercall_args, r13);
- OFFSET(TDX_HYPERCALL_r14, tdx_hypercall_args, r14);
- OFFSET(TDX_HYPERCALL_r15, tdx_hypercall_args, r15);
- OFFSET(TDX_HYPERCALL_rdi, tdx_hypercall_args, rdi);
- OFFSET(TDX_HYPERCALL_rsi, tdx_hypercall_args, rsi);
- OFFSET(TDX_HYPERCALL_rbx, tdx_hypercall_args, rbx);
- OFFSET(TDX_HYPERCALL_rdx, tdx_hypercall_args, rdx);
-
BLANK();
OFFSET(BP_scratch, boot_params, scratch);
OFFSET(BP_secure_boot, boot_params, secure_boot);
projects / linux.git / commitdiff