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Date: Thu, 19 Nov 2015 13:08:09 +0100 From: Borislav Petkov <bp@...e.de> To: Andy Lutomirski <luto@...capital.net> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, David Vrabel <david.vrabel@...rix.com>, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, Andrew Lutomirski <luto@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>, Linux Virtualization <virtualization@...ts.linux-foundation.org> Subject: Re: [PATCH 1/3] x86/xen: Avoid fast syscall path for Xen PV guests On Wed, Nov 18, 2015 at 12:21:56PM -0800, Andy Lutomirski wrote: > Could we make this a little less subtle: > > ALTERNATIVE "testl %eax, %eax; lz .Lsyscall_32_done", "jmp > .Lsyscasll_32_done", X86_FEATURE_XENPV > > Borislav, what do you think? I don't mind either. I would've said your version doesn't touch %eax so the result in there might be useful for callers but all paths do overwrite it, AFAICT. -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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