On Mon, Aug 22, 2016 at 07:24:07PM -0400, Brijesh Singh wrote: > From: Tom Lendacky <thomas.lendacky@xxxxxxx> > > When a guest causes a NPF which requires emulation, KVM sometimes walks > the guest page tables to translate the GVA to a GPA. This is unnecessary > most of the time on AMD hardware since the hardware provides the GPA in > EXITINFO2. > > The only exception cases involve string operations involving rep or > operations that use two memory locations. With rep, the GPA will only be > the value of the initial NPF and with dual memory locations we won't know > which memory address was translated into EXITINFO2. > > Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx> > --- > arch/x86/include/asm/kvm_emulate.h | 3 +++ > arch/x86/include/asm/kvm_host.h | 3 +++ > arch/x86/kvm/svm.c | 2 ++ > arch/x86/kvm/x86.c | 17 ++++++++++++++++- > 4 files changed, 24 insertions(+), 1 deletion(-) FWIW, LGTM. (Gotta love replying in acronyms :-)) Reviewed-by: Borislav Petkov <bp@xxxxxxx> -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) -- -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html