From 45bdbcfdf241149642fb6c25ab0c209d59c371b7 Mon Sep 17 00:00:00 2001 From: Huaitong Han Date: Tue, 12 Jan 2016 16:04:20 +0800 Subject: 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: [] dump_stack+0x40/0x57 [] vmx_cpuid_update+0x5d/0x150 [kvm_intel] [] kvm_vcpu_ioctl_set_cpuid2+0x4c/0x70 [kvm] [] kvm_arch_vcpu_ioctl+0x903/0xfa0 [kvm] Fixes: feda805fe7c4ed9cf78158e73b1218752e3b4314 Cc: stable@vger.kernel.org Reported-by: Zdenek Kaspar Signed-off-by: Huaitong Han Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch') 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)) -- cgit v1.2.3