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Groups > linux.kernel > #1273078
| From | Borislav Petkov <bp@suse.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 1/3] x86/xen: Avoid fast syscall path for Xen PV guests |
| Date | 2015-11-19 13:10 +0100 |
| Message-ID | <qwwci-Gn-13@gated-at.bofh.it> (permalink) |
| References | <qwhdg-7Lc-9@gated-at.bofh.it> <qwhdg-7Lc-29@gated-at.bofh.it> <qwhwC-7V2-33@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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)
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[PATCH 0/3] Fix and cleanup for 32-bit PV sysexit Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2015-11-18 21:10 +0100
[PATCH 1/3] x86/xen: Avoid fast syscall path for Xen PV guests Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2015-11-18 21:10 +0100
Re: [PATCH 1/3] x86/xen: Avoid fast syscall path for Xen PV guests Andy Lutomirski <luto@amacapital.net> - 2015-11-18 21:30 +0100
Re: [PATCH 1/3] x86/xen: Avoid fast syscall path for Xen PV guests Borislav Petkov <bp@suse.de> - 2015-11-18 21:50 +0100
Re: [PATCH 1/3] x86/xen: Avoid fast syscall path for Xen PV guests Brian Gerst <brgerst@gmail.com> - 2015-11-18 22:00 +0100
Re: [PATCH 1/3] x86/xen: Avoid fast syscall path for Xen PV guests Andy Lutomirski <luto@amacapital.net> - 2015-11-18 22:00 +0100
Re: [PATCH 1/3] x86/xen: Avoid fast syscall path for Xen PV guests Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2015-11-18 23:10 +0100
Re: [PATCH 1/3] x86/xen: Avoid fast syscall path for Xen PV guests Borislav Petkov <bp@suse.de> - 2015-11-19 13:10 +0100
Re: [PATCH 0/3] Fix and cleanup for 32-bit PV sysexit Borislav Petkov <bp@suse.de> - 2015-11-19 13:20 +0100
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