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Re: [PATCH 07/12] x86: Migrate x86_emulate/ to use cpu_vendor()
- To: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 12 Feb 2026 12:31:09 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 12 Feb 2026 11:31:19 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.02.2026 17:15, Alejandro Vallejo wrote:
> ... but keep the current behaviour of using the policy vendor when
> compiled for userspace, where cross-vendor configurations are expected.
>
> Not a functional change.
>
> Signed-off-by: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
Hmm, ...
> --- a/xen/arch/x86/x86_emulate/private.h
> +++ b/xen/arch/x86/x86_emulate/private.h
> @@ -15,6 +15,7 @@
> # include <xen/kernel.h>
>
> # include <asm/cpu-user-regs.h>
> +# include <asm/cpufeature.h>
> # include <asm/endbr.h>
> # include <asm/msr-index.h>
> # include <asm/stubs.h>
> @@ -30,8 +31,11 @@ void BUG(void);
> # define X86EMUL_NO_SIMD
> # endif
>
> +# define x86emul_cpu(cp) ({ (void)(cp); cpu_vendor(); })
> +
> #else /* !__XEN__ */
> # include "x86-emulate.h"
> +# define x86emul_cpu(cp) ((cp)->x86_vendor)
> #endif
... this looked familiar, yet different at the same time. It was only after
some eyebrow raising that I noticed that patch 07/12 appears twice in the
series, with different titles.
Jan
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