linux-kernel - [PATCH 0/2] KVM: vmx, pmu: respect KVM_GET_MSR_INDEX_LIST/KVM_SET

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Message-Id: <20220531175450.295552-1-pbonzini@redhat.com>
Date:   Tue, 31 May 2022 13:54:48 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     likexu@...cent.com
Subject: [PATCH 0/2] KVM: vmx, pmu: respect KVM_GET_MSR_INDEX_LIST/KVM_SET_MSR contracts

Whenever an MSR is part of KVM_GET_MSR_INDEX_LIST, it has to be always
settable with KVM_SET_MSR.  Right now MSR_IA32_DS_AREA, MSR_ARCH_LBR_DEPTH
and MSR_ARCH_LBR_CTL are not fulfilling this, resulting in selftests
failures on <=Skylake processors.

Fix this, and in general allow host-initiated writes of a default
value for all PMU MSRs

Paolo Bonzini (2):
  KVM: vmx, pmu: accept 0 for absent MSRs when host-initiated
  KVM: x86: always allow host-initiated writes to PMU MSRs

 arch/x86/kvm/pmu.c           |  4 ++--
 arch/x86/kvm/pmu.h           |  4 ++--
 arch/x86/kvm/svm/pmu.c       |  2 +-
 arch/x86/kvm/vmx/pmu_intel.c | 42 +++++++++++++++++++++++++-----------
 arch/x86/kvm/x86.c           | 10 ++++-----
 5 files changed, 39 insertions(+), 23 deletions(-)

-- 
2.31.1