From: Cédric Le Goater <clg@kaod.org>
Date: Tue, 13 Aug 2019 16:44:20 +0000 (+0200)
Subject: spapr/xive: Mask the EAS when allocating an IRQ
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f55750e4e4fb35b6a12c81c485f16494e2c61ad2;p=qemu.git

spapr/xive: Mask the EAS when allocating an IRQ

If an IRQ is allocated and not configured, such as a MSI requested by
a PCI driver, it can be saved in its default state and possibly later
on restored using the same state. If not initially MASKED, KVM will
try to find a matching priority/target tuple for the interrupt and
fail to restore the VM because 0/0 is not a valid target.

When allocating a IRQ number, the EAS should be set to a sane default :
VALID and MASKED.

Reported-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20190813164420.9829-1-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---

diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
index a29b48edf7..c1c97192a7 100644
--- a/hw/intc/spapr_xive.c
+++ b/hw/intc/spapr_xive.c
@@ -536,7 +536,10 @@ bool spapr_xive_irq_claim(SpaprXive *xive, uint32_t lisn, bool lsi)
         return false;
     }
 
-    xive->eat[lisn].w |= cpu_to_be64(EAS_VALID);
+    /*
+     * Set default values when allocating an IRQ number
+     */
+    xive->eat[lisn].w |= cpu_to_be64(EAS_VALID | EAS_MASKED);
     if (lsi) {
         xive_source_irq_set_lsi(xsrc, lisn);
     }