linux-kernel - [PATCH] KVM: x86/pmu: Add '.exclude_hv = 1' for guest perf

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Message-Id: <20200812050722.25824-1-like.xu@linux.intel.com>
Date:   Wed, 12 Aug 2020 13:07:22 +0800
From:   Like Xu <like.xu@...ux.intel.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Jin@...r.kernel.org, Yao <yao.jin@...ux.intel.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: x86/pmu: Add '.exclude_hv = 1' for guest perf_event

To emulate PMC counter for guest, KVM would create an
event on the host with 'exclude_guest=0, exclude_hv=0'
which simply makes no sense and is utterly broken.

To keep perf semantics consistent, any event created by
pmc_reprogram_counter() should both set exclude_hv and
exclude_host in the KVM context.

Message-ID: <20200811084548.GW3982@...ktop.programming.kicks-ass.net>
Signed-off-by: Like Xu <like.xu@...ux.intel.com>
---
 arch/x86/kvm/pmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 67741d2a0308..6a30763a10d7 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -108,6 +108,7 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
 		.exclude_host = 1,
 		.exclude_user = exclude_user,
 		.exclude_kernel = exclude_kernel,
+		.exclude_hv = 1,
 		.config = config,
 	};
 
-- 
2.21.3