tree 4c865f9aeb61137847ce9d283bc33febded17714
parent 1eff70a9abd46f175defafd29bc17ad456f398a7
author Boris Ostrovsky <boris.ostrovsky@oracle.com> 1575509451 +0000
committer Paolo Bonzini <pbonzini@redhat.com> 1580406355 +0100

x86/kvm: Cache gfn to pfn translation

__kvm_map_gfn()'s call to gfn_to_pfn_memslot() is
* relatively expensive
* in certain cases (such as when done from atomic context) cannot be called

Stashing gfn-to-pfn mapping should help with both cases.

This is part of CVE-2019-3016.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>