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Re: [Xen-devel] [PATCH v8 01/17] x86: Support compiling with indirect branch thunks
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
- From: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
- Date: Sun, 14 Jan 2018 20:48:26 +0100
- Delivery-date: Sun, 14 Jan 2018 19:48:46 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Fri, 2018-01-12 at 18:00 +0000, Andrew Cooper wrote:
>
> +.macro IND_THUNK_RETPOLINE reg:req
> + call 2f
> +1:
Linux and GCC have now settled on 'pause;lfence;jmp' here.
> + lfence
> + jmp 1b
> +2:
> + mov %\reg, (%rsp)
> + ret
> +.endm
> + Attachment:
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