6.6-stable review patch. If anyone has any objections, please let me know.
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From: Arnd Bergmann arnd@arndb.de
[ Upstream commit 93cd0597649844a0fe7989839a3202735fb3ae67 ]
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@arndb.de Reviewed-by: Juergen Gross jgross@suse.com Tested-by: Alyssa Ross hi@alyssa.is Link: https://lore.kernel.org/r/20231204084722.3789473-1-arnd@kernel.org Signed-off-by: Juergen Gross jgross@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/xen/Kconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig index 9b1ec5d8c99c8..a65fc2ae15b49 100644 --- a/arch/x86/xen/Kconfig +++ b/arch/x86/xen/Kconfig @@ -9,6 +9,7 @@ config XEN select PARAVIRT_CLOCK select X86_HV_CALLBACK_VECTOR depends on X86_64 || (X86_32 && X86_PAE) + depends on X86_64 || (X86_GENERIC || MPENTIUM4 || MCORE2 || MATOM || MK8) depends on X86_LOCAL_APIC && X86_TSC help This is the Linux Xen port. Enabling this will allow the