[Qemu-devel] [PATCH] pc: compat: remove PCLMULQDQ from Westmere on pc-*-1.4 and older

[Eduardo Habkost <ehabkost@redhat.com>]

commit 41cb383f42d0cb51d8e3e25e3ecebc954dd4196f made a guest-visible
change by adding the PCLMULQDQ bit to Westmere without adding
compatibility code to keep the ABI older machine-types. This patch fixes
it by adding the missing compat code.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
Bug detected by the virt-test CPUID-dump comparison test case, available at:
  https://github.com/autotest/virt-test/pull/714
---
 hw/i386/pc_piix.c | 1 +
 hw/i386/pc_q35.c  | 1 +
 2 files changed, 2 insertions(+)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index ab25458..2817092 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -259,6 +259,7 @@ static void pc_init_pci_1_4(QEMUMachineInitArgs *args)
 {
     has_pvpanic = false;
     x86_cpu_compat_set_features("n270", FEAT_1_ECX, 0, CPUID_EXT_MOVBE);
+    x86_cpu_compat_set_features("Westmere", FEAT_1_ECX, 0, CPUID_EXT_PCLMULQDQ);
     pc_init_pci_1_5(args);
 }
 
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 2f35d12..25c6b33 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -227,6 +227,7 @@ static void pc_q35_init_1_4(QEMUMachineInitArgs *args)
 {
     has_pvpanic = false;
     x86_cpu_compat_set_features("n270", FEAT_1_ECX, 0, CPUID_EXT_MOVBE);
+    x86_cpu_compat_set_features("Westmere", FEAT_1_ECX, 0, CPUID_EXT_PCLMULQDQ);
     pc_q35_init_1_5(args);
 }
 
-- 
1.8.3.1