linux-kernel - [PATCH v2 0/7] KVM: VMX: PT (processor trace) optimization cleanup and fixes

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Date:   Fri, 27 Aug 2021 15:02:42 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Xiaoyao Li <xiaoyao.li@...el.com>,
        Sean Christopherson <seanjc@...gle.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 v2 0/7] KVM: VMX: PT (processor trace) optimization cleanup and fixes

Patch 1-3 are optimization and cleanup. 

Patch 4-7 are fixes for PT. Patch 4 and 5 fix the virtulazation of PT to
provide architectual consistent behavior for guest. Patch 6 fix the case
that malicious userspace can exploit PT to cause vm-entry failure or #GP
in KVM. Patch 7 fix the potential MSR access #GP if some PT MSRs not
available on hardware.

Patch 3 and patch 7 are added in v2.

Xiaoyao Li (7):
  KVM: VMX: Restore host's MSR_IA32_RTIT_CTL when it's not zero
  KVM: VMX: Use precomputed vmx->pt_desc.addr_range
  KVM: VMX: Rename pt_desc.addr_range to pt_desc.nr_addr_range
  KVM: VMX: RTIT_CTL_BRANCH_EN has no dependency on other CPUID bit
  KVM: VMX: Disallow PT MSRs accessing if PT is not exposed to guest
  KVM: VMX: Check Intel PT related CPUID leaves
  KVM: VMX: Only context switch some PT MSRs when they exist

 arch/x86/kvm/cpuid.c   |  25 ++++++++++
 arch/x86/kvm/vmx/vmx.c | 110 ++++++++++++++++++++++++++---------------
 arch/x86/kvm/vmx/vmx.h |   2 +-
 3 files changed, 95 insertions(+), 42 deletions(-)

-- 
2.27.0