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Date: Wed, 29 Mar 2017 17:14:13 +0200 From: Borislav Petkov <bp@...e.de> To: Brijesh Singh <brijesh.singh@....com> Cc: simon.guinot@...uanux.org, linux-efi@...r.kernel.org, kvm@...r.kernel.org, rkrcmar@...hat.com, matt@...eblueprint.co.uk, linux-pci@...r.kernel.org, linus.walleij@...aro.org, gary.hook@....com, linux-mm@...ck.org, paul.gortmaker@...driver.com, hpa@...or.com, cl@...ux.com, dan.j.williams@...el.com, aarcange@...hat.com, sfr@...b.auug.org.au, andriy.shevchenko@...ux.intel.com, herbert@...dor.apana.org.au, bhe@...hat.com, xemul@...allels.com, joro@...tes.org, x86@...nel.org, peterz@...radead.org, piotr.luc@...el.com, mingo@...hat.com, msalter@...hat.com, ross.zwisler@...ux.intel.com, dyoung@...hat.com, thomas.lendacky@....com, jroedel@...e.de, keescook@...omium.org, arnd@...db.de, toshi.kani@....com, mathieu.desnoyers@...icios.com, luto@...nel.org, devel@...uxdriverproject.org, bhelgaas@...gle.com, tglx@...utronix.de, mchehab@...nel.org, iamjoonsoo.kim@....com, labbott@...oraproject.org, tony.luck@...el.com, alexandre.bounine@....com, kuleshovmail@...il.com, linux-kernel@...r.kernel.org, mcgrof@...nel.org, mst@...hat.com, linux-crypto@...r.kernel.org, tj@...nel.org, pbonzini@...hat.com, akpm@...ux-foundation.org, davem@...emloft.net Subject: Re: [RFC PATCH v2 18/32] kvm: svm: Use the hardware provided GPA instead of page walk On Thu, Mar 02, 2017 at 10:16:05AM -0500, Brijesh Singh wrote: > From: Tom Lendacky <thomas.lendacky@....com> > > 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@....com> > Reviewed-by: Borislav Petkov <bp@...e.de> I think I already asked you to remove Revewed-by tags when you have to change an already reviewed patch in non-trivial manner. Why does this one still have my Reviewed-by tag? -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
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