From: Jim Mattson jmattson@google.com
[ Upstream commit 020dac4187968535f089f83f376a72beb3451311 ]
Regardless of the 'msr' argument passed to the VMX version of msr_write_intercepted(), the function always checks to see if a specific MSR (IA32_SPEC_CTRL) is intercepted for write. This behavior seems unintentional and unexpected.
Modify the function so that it checks to see if the provided 'msr' index is intercepted for write.
Fixes: 67f4b9969c30 ("KVM: nVMX: Handle dynamic MSR intercept toggling") Cc: Sean Christopherson seanjc@google.com Signed-off-by: Jim Mattson jmattson@google.com Reviewed-by: Sean Christopherson seanjc@google.com Message-Id: 20220810213050.2655000-1-jmattson@google.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/kvm/vmx/vmx.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index cfb3a5c809f2e..e5584e974c774 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -831,8 +831,7 @@ static bool msr_write_intercepted(struct vcpu_vmx *vmx, u32 msr) if (!(exec_controls_get(vmx) & CPU_BASED_USE_MSR_BITMAPS)) return true;
- return vmx_test_msr_bitmap_write(vmx->loaded_vmcs->msr_bitmap, - MSR_IA32_SPEC_CTRL); + return vmx_test_msr_bitmap_write(vmx->loaded_vmcs->msr_bitmap, msr); }
unsigned int __vmx_vcpu_run_flags(struct vcpu_vmx *vmx)