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Date: Tue, 25 Aug 2020 10:41:46 -0700 From: Andy Lutomirski <luto@...nel.org> To: "Luck, Tony" <tony.luck@...el.com> Cc: Andy Lutomirski <luto@...nel.org>, "Christopherson, Sean J" <sean.j.christopherson@...el.com>, 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 Tue, Aug 25, 2020 at 10:36 AM Luck, Tony <tony.luck@...el.com> 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. Crashing the system is one thing. Corrupting the system in a way that could allow code execution is another thing entirely. And the whole point of TDX is to defend the guest against the hypervisor.
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