[v1] i386: Fix nested SVM on older Opterons

[Qemu-devel] [PATCH] i386: Fix nested SVM on older Opterons

Bernhard M. Wiedemann posted 1 patch 4 years, 11 months ago

Diff against v1
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git fetch https://github.com/patchew-project/qemu tags/patchew/20190516143839.19173-1-bwiedemann@suse.de

Maintainers: Paolo Bonzini <pbonzini@redhat.com>, Eduardo Habkost <ehabkost@redhat.com>, Richard Henderson <rth@twiddle.net>

target/i386/cpu.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

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[Qemu-devel] [PATCH] i386: Fix nested SVM on older Opterons

Posted by Bernhard M. Wiedemann 4 years, 11 months ago

Without this patch, a VM on a Opteron G3 host will have the svm flag, but
the kvm-amd module fails to load in there, complaining that it needs
cpuid 0x8000000a

I have successfully built and tested this for 3+ years in production
on Opteron G3 servers.

Signed-off-by: Bernhard M. Wiedemann <bwiedemann@suse.de>
---
 target/i386/cpu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 722c5514d4..df1d81ded8 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -2723,7 +2723,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
             CPUID_EXT_SSE3,
         .features[FEAT_8000_0001_EDX] =
             CPUID_EXT2_LM | CPUID_EXT2_NX | CPUID_EXT2_SYSCALL,
-        .xlevel = 0x80000008,
+        .xlevel = 0x8000000A,
         .model_id = "AMD Opteron 240 (Gen 1 Class Opteron)",
     },
     {
@@ -2745,7 +2745,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
             CPUID_EXT2_LM | CPUID_EXT2_NX | CPUID_EXT2_SYSCALL,
         .features[FEAT_8000_0001_ECX] =
             CPUID_EXT3_SVM | CPUID_EXT3_LAHF_LM,
-        .xlevel = 0x80000008,
+        .xlevel = 0x8000000A,
         .model_id = "AMD Opteron 22xx (Gen 2 Class Opteron)",
     },
     {
@@ -2770,7 +2770,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .features[FEAT_8000_0001_ECX] =
             CPUID_EXT3_MISALIGNSSE | CPUID_EXT3_SSE4A |
             CPUID_EXT3_ABM | CPUID_EXT3_SVM | CPUID_EXT3_LAHF_LM,
-        .xlevel = 0x80000008,
+        .xlevel = 0x8000000A,
         .model_id = "AMD Opteron 23xx (Gen 3 Class Opteron)",
     },
     {
-- 
2.16.4