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Groups > linux.kernel > #1341035 > unrolled thread

[PATCH] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32

Started byAndy Lutomirski <luto@kernel.org>
First post2016-02-23 22:20 +0100
Last post2016-02-25 22:00 +0100
Articles 1 on this page of 21 — 8 participants

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  [PATCH] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Andy Lutomirski <luto@kernel.org> - 2016-02-23 22:20 +0100
    Re: [PATCH] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Brian Gerst <brgerst@gmail.com> - 2016-02-24 16:50 +0100
      Re: [PATCH] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Andy Lutomirski <luto@amacapital.net> - 2016-02-24 18:00 +0100
    [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 tip-bot for Andy Lutomirski <tipbot@zytor.com> - 2016-02-25 07:00 +0100
      Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to  entry_SYSENTER_32 "H. Peter Anvin" <hpa@zytor.com> - 2016-02-25 07:30 +0100
        Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Andy Lutomirski <luto@amacapital.net> - 2016-02-25 09:10 +0100
          Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Andy Lutomirski <luto@amacapital.net> - 2016-02-25 09:20 +0100
          Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to  entry_SYSENTER_32 Ingo Molnar <mingo@kernel.org> - 2016-02-25 09:20 +0100
            Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to  entry_SYSENTER_32 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-25 09:30 +0100
              Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to  entry_SYSENTER_32 Ingo Molnar <mingo@kernel.org> - 2016-02-25 09:50 +0100
                Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to  entry_SYSENTER_32 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-25 10:10 +0100
        Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Brian Gerst <brgerst@gmail.com> - 2016-02-25 14:50 +0100
          Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Brian Gerst <brgerst@gmail.com> - 2016-02-25 16:50 +0100
            Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Andy Lutomirski <luto@amacapital.net> - 2016-02-25 19:30 +0100
              Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Linus Torvalds <torvalds@linux-foundation.org> - 2016-02-25 19:40 +0100
                Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Andy Lutomirski <luto@amacapital.net> - 2016-02-25 19:50 +0100
                Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Brian Gerst <brgerst@gmail.com> - 2016-02-25 20:40 +0100
                  Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Andy Lutomirski <luto@amacapital.net> - 2016-02-25 20:50 +0100
                    Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Brian Gerst <brgerst@gmail.com> - 2016-02-25 20:50 +0100
                      Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Andy Lutomirski <luto@amacapital.net> - 2016-02-25 21:00 +0100
                  Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 Linus Torvalds <torvalds@linux-foundation.org> - 2016-02-25 22:00 +0100

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#1343477 — Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32

FromLinus Torvalds <torvalds@linux-foundation.org>
Date2016-02-25 22:00 +0100
SubjectRe: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32
Message-ID<r6baW-UP-5@gated-at.bofh.it>
In reply to#1343431
On Thu, Feb 25, 2016 at 11:31 AM, Brian Gerst <brgerst@gmail.com> wrote:
>
> According to the SDM, popf will change IOPL only at CPL0,

Ok, so that's good enough for the native case, and adding a "popf"
would at least restore AC and IOPL.

                 Linus

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