The existing implementation for loading the IA32_PERF_GLOBAL_CTRL MSR on VM-exit was incorrect, as the next call to atomic_switch_perf_msrs() could cause this value to be overwritten. Instead, call kvm_set_msr() which will allow atomic_switch_perf_msrs() to correctly set the values. Suggested-by: Jim Mattson <jmattson@xxxxxxxxxx> Co-developed-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx> Signed-off-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx> Signed-off-by: Oliver Upton <oupton@xxxxxxxxxx> Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx> Reviewed-by: Peter Shier <pshier@xxxxxxxxxx> --- arch/x86/kvm/vmx/nested.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index ced9fba32598..b0ca34bf4d21 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -3724,6 +3724,7 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) { struct kvm_segment seg; + struct msr_data msr_info; u32 entry_failure_code; if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER) @@ -3800,9 +3801,15 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu, vmcs_write64(GUEST_IA32_PAT, vmcs12->host_ia32_pat); vcpu->arch.pat = vmcs12->host_ia32_pat; } - if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL) - vmcs_write64(GUEST_IA32_PERF_GLOBAL_CTRL, - vmcs12->host_ia32_perf_global_ctrl); + if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL) { + msr_info.host_initiated = false; + msr_info.index = MSR_CORE_PERF_GLOBAL_CTRL; + msr_info.data = vmcs12->host_ia32_perf_global_ctrl; + if (kvm_set_msr(vcpu, &msr_info)) + pr_debug_ratelimited( + "%s cannot write MSR (0x%x, 0x%llx)\n", + __func__, msr_info.index, msr_info.data); + } /* Set L1 segment info according to Intel SDM 27.5.2 Loading Host Segment and Descriptor-Table Registers */ -- 2.23.0.187.g17f5b7556c-goog