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

[Paolo Bonzini]

On 31/08/21 18:42, Sean Christopherson wrote:
> 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(-)

Queued 2 and 3 too now, thanks.

Paolo