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Date: Tue, 25 Aug 2020 11:38:31 -0700 From: Dave Hansen <dave.hansen@...el.com> To: Andrew Cooper <amc96@....ac.uk>, "Luck, Tony" <tony.luck@...el.com>, Andy Lutomirski <luto@...nel.org>, "Christopherson, Sean J" <sean.j.christopherson@...el.com> Cc: Andrew Cooper <andrew.cooper3@...rix.com>, Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Tom Lendacky <thomas.lendacky@....com>, Pu Wen <puwen@...on.cn>, Stephen Hemminger <sthemmin@...rosoft.com>, Sasha Levin <alexander.levin@...rosoft.com>, Dirk Hohndel <dirkhh@...are.com>, Jan Kiszka <jan.kiszka@...mens.com>, Tony W Wang-oc <TonyWWang-oc@...oxin.com>, "H. Peter Anvin" <hpa@...ux.intel.com>, "Mallick, Asit K" <asit.k.mallick@...el.com>, Gordon Tetlow <gordon@...lows.org>, David Kaplan <David.Kaplan@....com> Subject: Re: TDX #VE in SYSCALL gap (was: [RFD] x86: Curing the exception and syscall trainwreck in hardware) On 8/25/20 10:59 AM, Andrew Cooper wrote: > If I've read the TDX spec/whitepaper properly, the main hypervisor can > write to all the encrypted pages. This will destroy data, break the > MAC, and yields #PF inside the SEAM hypervisor, or the TD when the cache > line is next referenced. I think you're talking about: > Attempting to access a private KeyID by software outside the SEAM > mode would cause a page-fault exception (#PF). I don't think that ever results in a TD guest #PF. "A MAC-verification failure would be fatal to the TD and lead to its termination." In this context, I think that means that the TD stops running and can not be reentered.
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