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Date: Tue, 25 Aug 2020 21:49:07 +0200 From: Thomas Gleixner <tglx@...utronix.de> To: "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>, 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 Tue, Aug 25 2020 at 17:35, Tony Luck wrote: >> > Or malicious hypervisor action, and that's a problem. >> > >> > Suppose the hypervisor remaps a GPA used in the SYSCALL gap (e.g. the >> > actual SYSCALL text or the first memory it accesses -- I don't have a >> > TDX spec so I don't know the details). > > Is it feasible to defend against a malicious (or buggy) hypervisor? > > Obviously, we can't leave holes that guests can exploit. But the hypervisor > can crash the system no matter how clever TDX is. If it crashes and burns reliably then fine, but is that guaranteed? I have serious doubts about that given the history and fragility of all of this and I really have zero interest in dealing with the fallout a year from now. Thanks, tglx
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