linux-kernel - [PATCH 0/2] KVM: VMX: x2APIC + APICV MSR fix and cleanup

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Message-Id: <20201005195532.8674-1-sean.j.christopherson@intel.com>
Date:   Mon,  5 Oct 2020 12:55:30 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     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, Alexander Graf <graf@...zon.com>,
        Aaron Lewis <aaronlewis@...gle.com>,
        Peter Xu <peterx@...hat.com>
Subject: [PATCH 0/2] KVM: VMX: x2APIC + APICV MSR fix and cleanup

Patch 1 is an unofficial patch from Peter to fix x2APIC MSR interception
on non-APICV systems.  As Peter suggested, it really should be squashed
with commit 3eb900173c71 ("KVM: x86: VMX: Prevent MSR passthrough when MSR
access is denied").  Without the fix, KVM is completely busted on
non-APICV systems.

Patch 2 is a cleanup of sorts to revert back to the pre-filtering approach
of initializing the x2APIC MSR bitmaps for APICV.

Note, I haven't tested on an APICV system.  My APICV system appears to
have crashed over the weekend and I haven't yet journeyed back to the
lab to kick it.

Peter Xu (1):
  KVM: VMX: Fix x2APIC MSR intercept handling on !APICV platforms

Sean Christopherson (1):
  KVM: VMX: Ignore userspace MSR filters for x2APIC when APICV is
    enabled

 arch/x86/kvm/vmx/vmx.c | 45 ++++++++++++++++++++++++++++--------------
 1 file changed, 30 insertions(+), 15 deletions(-)

-- 
2.28.0