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Re: [PATCH] x86/xen: Fix __xen_hypercall_setfunc
- To: Ingo Molnar <mingo@xxxxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Fri, 11 Apr 2025 11:29:47 +0200
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- Cc: Jason Andryuk <jason.andryuk@xxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, "Xin Li (Intel)" <xin@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- Delivery-date: Fri, 11 Apr 2025 09:29:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.04.25 11:27, Ingo Molnar wrote:
* Juergen Gross <jgross@xxxxxxxx> wrote:
On 10.04.25 21:31, Jason Andryuk wrote:
Hypercall detection is failing with xen_hypercall_intel() chosen even on
an AMD processor. Looking at the disassembly, the call to
xen_get_vendor() was removed.
The check for boot_cpu_has(X86_FEATURE_CPUID) was used as a proxy for
the x86_vendor having been set. When
CONFIG_X86_REQUIRED_FEATURE_CPUID=y (the default value), DCE eliminates
the call to xen_get_vendor(). An uninitialized value 0 means
X86_VENDOR_INTEL, so the Intel function is always returned.
Remove the if and always call xen_get_vendor() to avoid this issue.
Fixes: 3d37d9396eb3 ("x86/cpufeatures: Add {REQUIRED,DISABLED} feature configs")
Suggested-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Wanna merge this via the Xen tree, or should it go to x86/urgent?
The bug was *caused* by the x86 tree so we'd be glad to merge,
but your call.
x86/urgent is fine for me.
Juergen
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