linux-kernel - [PATCH 0/3] KVM: x86: guest.MAXPHYADDR fix and related cleanup

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Date:   Tue, 31 Aug 2021 09:42:21 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     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,
        syzbot+200c08e88ae818f849ce@...kaller.appspotmail.com
Subject: [PATCH 0/3] KVM: x86: guest.MAXPHYADDR fix and related cleanup

Fix a bug exposed by syzkaller where running with guest.MAXPHYADDR < 32
leads KVM injecting a garbage exception due to mishandling an illegal GPA
check when "translating" a non-nested GPA.

Clean up tangentially related code in load_pdptrs() to discourage reading
guest memory using a potentially-nested GPA.

Sean Christopherson (3):
  Revert "KVM: x86: mmu: Add guest physical address check in
    translate_gpa()"
  KVM: x86: Subsume nested GPA read helper into load_pdptrs()
  KVM: x86: Simplify retrieving the page offset when loading PDTPRs

 arch/x86/include/asm/kvm_host.h |  3 --
 arch/x86/kvm/mmu/mmu.c          |  6 ----
 arch/x86/kvm/x86.c              | 56 +++++++++++----------------------
 3 files changed, 18 insertions(+), 47 deletions(-)

-- 
2.33.0.259.gc128427fd7-goog