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Date: Fri, 11 Feb 2022 15:09:12 -0600 From: Tom Lendacky <thomas.lendacky@....com> To: "Limonciello, Mario" <mario.limonciello@....com>, Borislav Petkov <bp@...en8.de>, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org> Cc: Kees Cook <keescook@...omium.org>, hughsient@...il.com, Martin Fernandez <martin.fernandez@...ypsium.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/2] x86: Use CPUID 0x8000001f to confirm SME availability On 2/11/22 13:51, Limonciello, Mario wrote: > On 2/11/2022 08:55, Tom Lendacky wrote: >> On 2/10/22 23:36, Mario Limonciello wrote: > 1254: f6 45 d8 01 testb $0x1,-0x28(%rbp) > 1258: 74 02 je 125c <stop_this_cpu+0x8c> > 125a: 0f 09 wbinvd > 125c: eb 07 jmp 1265 <stop_this_cpu+0x95> > 125e: 0f 00 2d 00 00 00 00 verw 0x0(%rip) # 1265 > <stop_this_cpu+0x95> > 1265: f4 hlt > 1266: eb f4 jmp 125c <stop_this_cpu+0x8c> That appears to be the same as today after the WBINVD is issued, so should be good. Thanks, Tom >
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