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Re: [PATCH 13/22] x86: FRED enumerations
- To: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 13 Aug 2025 13:28:56 +0100
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- Cc: Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 13 Aug 2025 12:29:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 08/08/2025 9:23 pm, Andrew Cooper wrote:
> diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig
> index a45ce106e210..90cbad13a7c7 100644
> --- a/xen/arch/x86/Kconfig
> +++ b/xen/arch/x86/Kconfig
> @@ -57,6 +57,10 @@ config HAS_CC_CET_IBT
> # Retpoline check to work around
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93654
> def_bool $(cc-option,-fcf-protection=branch -mmanual-endbr
> -mindirect-branch=thunk-extern) && $(as-instr,endbr64)
>
> +config HAS_AS_FRED
> + # binutils >= 2.41 or LLVM >= 19
> + def_bool $(as-instr,eretu;lkgs %ax)
> +
> menu "Architecture Features"
>
> source "arch/x86/Kconfig.cpu"
> diff --git a/xen/arch/x86/include/asm/asm-defns.h
> b/xen/arch/x86/include/asm/asm-defns.h
> index 61a5faf90446..2e5200b94b82 100644
> --- a/xen/arch/x86/include/asm/asm-defns.h
> +++ b/xen/arch/x86/include/asm/asm-defns.h
> @@ -4,6 +4,15 @@
> .byte 0x0f, 0x01, 0xfc
> .endm
>
> +#ifndef CONFIG_HAS_AS_FRED
> +.macro eretu
> + .byte 0xf3, 0x0f, 0x01, 0xca
> +.endm
> +.macro erets
> + .byte 0xf2, 0x0f, 0x01, 0xca
> +.endm
> +#endif
Seeing as I know you are going to be unhappy with the Kconfig...
I think I'm dev complete on the PV support now, and there's not an LKGS
in sight.
We don't strictly need the conditional in asm-defns.h, and if we don't
need it in C either then we can drop the Kconfig entirely.
~Andrew
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