diff options
| -rw-r--r-- | arch/x86/kvm/svm/svm.c | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index dca87d9e5850..1ed5aa76e06c 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -3177,17 +3177,6 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) } /* - * AMD changed the architectural behavior of bits 5:2. On CPUs - * without BusLockTrap, bits 5:2 control "external pins", but - * on CPUs that support BusLockDetect, bit 2 enables BusLockTrap - * and bits 5:3 are reserved-to-zero. Sadly, old KVM allowed - * the guest to set bits 5:2 despite not actually virtualizing - * Performance-Monitoring/Breakpoint external pins. Drop bits - * 5:2 for backwards compatibility. - */ - data &= ~GENMASK(5, 2); - - /* * Suppress BTF as KVM doesn't virtualize BTF, but there's no * way to communicate lack of support to the guest. */ |