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Re: [PATCH 1/2] x86/xen: add CPU dependencies for 32-bit build
- To: Arnd Bergmann <arnd@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Mon, 4 Dec 2023 13:59:31 +0100
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- Cc: Arnd Bergmann <arnd@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- Delivery-date: Mon, 04 Dec 2023 12:59:39 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.12.23 09:47, Arnd Bergmann wrote:
From: Arnd Bergmann <arnd@xxxxxxxx>
Xen only supports modern CPUs even when running a 32-bit kernel, and it now
requires a kernel built for a 64 byte (or larger) cache line:
In file included from <command-line>:
In function 'xen_vcpu_setup',
inlined from 'xen_vcpu_setup_restore' at arch/x86/xen/enlighten.c:111:3,
inlined from 'xen_vcpu_restore' at arch/x86/xen/enlighten.c:141:3:
include/linux/compiler_types.h:435:45: error: call to '__compiletime_assert_287'
declared with attribute error: BUILD_BUG_ON failed: sizeof(*vcpup) >
SMP_CACHE_BYTES
arch/x86/xen/enlighten.c:166:9: note: in expansion of macro 'BUILD_BUG_ON'
166 | BUILD_BUG_ON(sizeof(*vcpup) > SMP_CACHE_BYTES);
| ^~~~~~~~~~~~
Enforce the dependency with a whitelist of CPU configurations. In normal
distro kernels, CONFIG_X86_GENERIC is enabled, and this works fine. When this
is not set, still allow Xen to be built on kernels that target a 64-bit
capable CPU.
Fixes: db2832309a82 ("x86/xen: fix percpu vcpu_info allocation")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Juergen
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