KVM: x86: nSVM: fix potential NULL derefernce on nested migration

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Turns out that due to review feedback and/or rebases
I accidentally moved the call to nested_svm_load_cr3 to be too early,
before the NPT is enabled, which is very wrong to do.

KVM can't even access guest memory at that point as nested NPT
is needed for that, and of course it won't initialize the walk_mmu,
which is main issue the patch was addressing.

Fix this for real.

Fixes: 232f75d3b4 ("KVM: nSVM: call nested_svm_load_cr3 on nested state load")
Cc: stable@vger.kernel.org

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220207155447.840194-3-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

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Maxim Levitsky 2022-02-07 17:54:19 +02:00 • committed by Paolo Bonzini

parent c53bbe2145

commit e1779c2714

1 changed files with 14 additions and 12 deletions

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arch/x86/kvm/svm/nested.c

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