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authorVitaly Kuznetsov <vkuznets@redhat.com>2020-06-19 11:40:46 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2020-06-19 08:13:40 -0400
commit49097762fa405cdc16f8f597f6d27c078d4a31e9 (patch)
tree853447931fe925cb40339c8ac61f3cf2accdd33b /arch/x86
parent88c200d929c969408779dbae4c4fad32bc510373 (diff)
downloadlinux-49097762fa405cdc16f8f597f6d27c078d4a31e9.tar.bz2
Revert "KVM: VMX: Micro-optimize vmexit time when not exposing PMU"
Guest crashes are observed on a Cascade Lake system when 'perf top' is launched on the host, e.g. BUG: unable to handle kernel paging request at fffffe0000073038 PGD 7ffa7067 P4D 7ffa7067 PUD 7ffa6067 PMD 7ffa5067 PTE ffffffffff120 Oops: 0000 [#1] SMP PTI CPU: 1 PID: 1 Comm: systemd Not tainted 4.18.0+ #380 ... Call Trace: serial8250_console_write+0xfe/0x1f0 call_console_drivers.constprop.0+0x9d/0x120 console_unlock+0x1ea/0x460 Call traces are different but the crash is imminent. The problem was blindly bisected to the commit 041bc42ce2d0 ("KVM: VMX: Micro-optimize vmexit time when not exposing PMU"). It was also confirmed that the issue goes away if PMU is exposed to the guest. With some instrumentation of the guest we can see what is being switched (when we do atomic_switch_perf_msrs()): vmx_vcpu_run: switching 2 msrs vmx_vcpu_run: switching MSR38f guest: 70000000d host: 70000000f vmx_vcpu_run: switching MSR3f1 guest: 0 host: 2 The current guess is that PEBS (MSR_IA32_PEBS_ENABLE, 0x3f1) is to blame. Regardless of whether PMU is exposed to the guest or not, PEBS needs to be disabled upon switch. This reverts commit 041bc42ce2d0efac3b85bbb81dea8c74b81f4ef9. Reported-by: Maxime Coquelin <maxime.coquelin@redhat.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20200619094046.654019-1-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/vmx/vmx.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 36c771728c8c..b1a23ad986ff 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6728,8 +6728,7 @@ reenter_guest:
pt_guest_enter(vmx);
- if (vcpu_to_pmu(vcpu)->version)
- atomic_switch_perf_msrs(vmx);
+ atomic_switch_perf_msrs(vmx);
atomic_switch_umwait_control_msr(vmx);
if (enable_preemption_timer)