kvm: x86: Defer setting of CR2 until #PF delivery

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When exception payloads are enabled by userspace (which is not yet
possible) and a #PF is raised in L2, defer the setting of CR2 until
the #PF is delivered. This allows the L1 hypervisor to intercept the
fault before CR2 is modified.

For backwards compatibility, when exception payloads are not enabled
by userspace, kvm_multiple_exception modifies CR2 when the #PF
exception is raised.

Reported-by: Jim Mattson <jmattson@google.com>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Jim Mattson 2018-10-16 14:29:22 -07:00 • committed by Paolo Bonzini

parent 91e86d225e

commit da998b46d2

4 changed files with 62 additions and 21 deletions

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13

arch/x86/kvm/svm.c

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19

arch/x86/kvm/vmx.c

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49

arch/x86/kvm/x86.c

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2

arch/x86/kvm/x86.h

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