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| author | Huaitong Han <huaitong.han@intel.com> | 2016-01-12 16:04:20 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-01-12 11:42:16 +0100 |
| commit | 45bdbcfdf241149642fb6c25ab0c209d59c371b7 (patch) | |
| tree | 51e626bec2fee316a1e5cd61873c26cb725e1ab0 | |
| parent | ac3e5fcae8ca658e7dcc3fdcd50af7e4779f58c1 (diff) | |
| download | talos-obmc-linux-45bdbcfdf241149642fb6c25ab0c209d59c371b7.tar.gz talos-obmc-linux-45bdbcfdf241149642fb6c25ab0c209d59c371b7.zip | |
kvm: x86: Fix vmwrite to SECONDARY_VM_EXEC_CONTROL
vmx_cpuid_tries to update SECONDARY_VM_EXEC_CONTROL in the VMCS, but
it will cause a vmwrite error on older CPUs because the code does not
check for the presence of CPU_BASED_ACTIVATE_SECONDARY_CONTROLS.
This will get rid of the following trace on e.g. Core2 6600:
vmwrite error: reg 401e value 10 (err 12)
Call Trace:
[<ffffffff8116e2b9>] dump_stack+0x40/0x57
[<ffffffffa020b88d>] vmx_cpuid_update+0x5d/0x150 [kvm_intel]
[<ffffffffa01d8fdc>] kvm_vcpu_ioctl_set_cpuid2+0x4c/0x70 [kvm]
[<ffffffffa01b8363>] kvm_arch_vcpu_ioctl+0x903/0xfa0 [kvm]
Fixes: feda805fe7c4ed9cf78158e73b1218752e3b4314
Cc: stable@vger.kernel.org
Reported-by: Zdenek Kaspar <zkaspar82@gmail.com>
Signed-off-by: Huaitong Han <huaitong.han@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/vmx.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 62d958a1ec0f..be3f1735d5eb 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -8989,7 +8989,8 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu) best->ebx &= ~bit(X86_FEATURE_INVPCID); } - vmcs_set_secondary_exec_control(secondary_exec_ctl); + if (cpu_has_secondary_exec_ctrls()) + vmcs_set_secondary_exec_control(secondary_exec_ctl); if (static_cpu_has(X86_FEATURE_PCOMMIT) && nested) { if (guest_cpuid_has_pcommit(vcpu)) |
