KVM: x86: Reject loading KVM if host.PAT[0] != WB

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Reject KVM if entry '0' in the host's IA32_PAT MSR is not programmed to
writeback (WB) memtype.  KVM subtly relies on IA32_PAT entry '0' to be
programmed to WB by leaving the PAT bits in shadow paging and NPT SPTEs
as '0'.  If something other than WB is in PAT[0], at _best_ guests will
suffer very poor performance, and at worst KVM will crash the system by
breaking cache-coherency expecations (e.g. using WC for guest memory).

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220715230016.3762909-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2022-07-15 23:00:13 +00:00 • committed by Paolo Bonzini

parent 01e69cef63

commit 94bda2f4cd

1 changed files with 15 additions and 0 deletions

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arch/x86/kvm/x86.c

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