On 2018/9/18 21:00, Peter Zijlstra wrote:
On Tue, Sep 18, 2018 at 08:04:44PM +0800, Zhenzhong Duan wrote:
On 2018/9/18 18:59, Peter Zijlstra wrote:
On Tue, Sep 18, 2018 at 06:31:07PM +0800, Zhenzhong Duan wrote:
On 2018/9/18 17:50, Peter Zijlstra wrote:
On Mon, Sep 17, 2018 at 10:17:30PM -070
On Tue, 2018-09-18 at 15:03 +0200, Peter Zijlstra wrote:
> > > In original code, it will go to "call *%[thunk_target]\n" while
> > > we have set SPECTRE_V2_RETPOLINE_MINIMAL or
> > > SPECTRE_V2_RETPOLINE_MINIMAL_AMD. Is this expected?
> >
> > Yes, that is exactly right -- it does that with or with
> > In original code, it will go to "call *%[thunk_target]\n" while
> > we have set SPECTRE_V2_RETPOLINE_MINIMAL or
> > SPECTRE_V2_RETPOLINE_MINIMAL_AMD. Is this expected?
>
> Yes, that is exactly right -- it does that with or without your change
> though.
Soryr, I wrote that before I noticed the
On Tue, Sep 18, 2018 at 08:04:44PM +0800, Zhenzhong Duan wrote:
> On 2018/9/18 18:59, Peter Zijlstra wrote:
> > On Tue, Sep 18, 2018 at 06:31:07PM +0800, Zhenzhong Duan wrote:
> > > On 2018/9/18 17:50, Peter Zijlstra wrote:
> > > > On Mon, Sep 17, 2018 at 10:17:30PM -0700, Zhenzhong Duan wrote:
> >
On 2018/9/18 18:59, Peter Zijlstra wrote:
On Tue, Sep 18, 2018 at 06:31:07PM +0800, Zhenzhong Duan wrote:
On 2018/9/18 17:50, Peter Zijlstra wrote:
On Mon, Sep 17, 2018 at 10:17:30PM -0700, Zhenzhong Duan wrote:
-#elif defined(CONFIG_X86_32) && defined(CONFIG_RETPOLINE)
+#elif defined(CONFIG_R
On Tue, Sep 18, 2018 at 06:31:07PM +0800, Zhenzhong Duan wrote:
> On 2018/9/18 17:50, Peter Zijlstra wrote:
> > On Mon, Sep 17, 2018 at 10:17:30PM -0700, Zhenzhong Duan wrote:
> > > -#elif defined(CONFIG_X86_32) && defined(CONFIG_RETPOLINE)
> > > +#elif defined(CONFIG_RETPOLINE)
> >
> > This doesn
On 2018/9/18 17:50, Peter Zijlstra wrote:
On Mon, Sep 17, 2018 at 10:17:30PM -0700, Zhenzhong Duan wrote:
Lfence is preferred than general retpoline on AMD, add this option
in C / inline asm just as the ASM code does.
For x86_64, it still help to have minimal retpoline for kernel even
if gcc do
On Mon, Sep 17, 2018 at 10:17:30PM -0700, Zhenzhong Duan wrote:
> Lfence is preferred than general retpoline on AMD, add this option
> in C / inline asm just as the ASM code does.
>
> For x86_64, it still help to have minimal retpoline for kernel even
> if gcc doesn't support it, change the inline
Lfence is preferred than general retpoline on AMD, add this option
in C / inline asm just as the ASM code does.
For x86_64, it still help to have minimal retpoline for kernel even
if gcc doesn't support it, change the inline asm for x86 so that it
could also be used by x86_64.
Add ANNOTATE_NOSPEC
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