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From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Subject: [PATCH 2/2] KVM: x86/pmu: do not mask the value that is written to fixed PMUs
Date: Mon, 20 May 2019 17:42:31 +0200	[thread overview]
Message-ID: <1558366951-19259-3-git-send-email-pbonzini@redhat.com> (raw)
In-Reply-To: <1558366951-19259-1-git-send-email-pbonzini@redhat.com>

According to the SDM, for MSR_IA32_PERFCTR0/1 "the lower-order 32 bits of
each MSR may be written with any value, and the high-order 8 bits are
sign-extended according to the value of bit 31", but the fixed counters
in real hardware appear to be limited to the width of the fixed counters.
Fix KVM to do the same.

Reported-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/kvm/vmx/pmu_intel.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index b6f5157445fe..a99613a060dd 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -240,11 +240,14 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 		}
 		break;
 	default:
-		if ((pmc = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0)) ||
-		    (pmc = get_fixed_pmc(pmu, msr))) {
-			if (!msr_info->host_initiated)
-				data = (s64)(s32)data;
-			pmc->counter += data - pmc_read_counter(pmc);
+		if ((pmc = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0))) {
+			if (msr_info->host_initiated)
+				pmc->counter = data;
+			else
+				pmc->counter = (s32)data;
+			return 0;
+		} else if ((pmc = get_fixed_pmc(pmu, msr))) {
+			pmc->counter = data;
 			return 0;
 		} else if ((pmc = get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0))) {
 			if (data == pmc->eventsel)
-- 
1.8.3.1


  parent reply	other threads:[~2019-05-20 15:42 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-20 15:42 [PATCH 0/2] " Paolo Bonzini
2019-05-20 15:42 ` [PATCH 1/2] KVM: x86/pmu: mask the result of rdpmc according to the width of the counters Paolo Bonzini
2019-05-20 15:42 ` Paolo Bonzini [this message]
2019-05-20 19:01   ` [PATCH 2/2] KVM: x86/pmu: do not mask the value that is written to fixed PMUs Sean Christopherson
2019-05-22 10:27     ` Paolo Bonzini

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