Patchwork [04/21] KVM: x86: Fix up misreported CPU features

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Submitter Jan Kiszka
Date Feb. 2, 2010, 8:18 a.m.
Message ID <46da1a46a36f5dcbda7852fb60ef330b49755fa4.1265098706.git.jan.kiszka@siemens.com>
Download mbox | patch
Permalink /patch/44243/
State New
Headers show

Comments

Jan Kiszka - Feb. 2, 2010, 8:18 a.m.
From qemu-kvm: Kernels before 2.6.30 misreported some essential CPU
features via KVM_GET_SUPPORTED_CPUID. Fix them up.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 target-i386/kvm.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

Patch

diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 504f501..9fb96b5 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -101,12 +101,18 @@  uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function, int reg)
                 break;
             case R_EDX:
                 ret = cpuid->entries[i].edx;
-                if (function == 0x80000001) {
+                switch (function) {
+                case 1:
+                    /* KVM before 2.6.30 misreports the following features */
+                    ret |= CPUID_MTRR | CPUID_PAT | CPUID_MCE | CPUID_MCA;
+                    break;
+                case 0x80000001:
                     /* On Intel, kvm returns cpuid according to the Intel spec,
                      * so add missing bits according to the AMD spec:
                      */
                     cpuid_1_edx = kvm_arch_get_supported_cpuid(env, 1, R_EDX);
                     ret |= cpuid_1_edx & 0xdfeff7ff;
+                    break;
                 }
                 break;
             }