arm/xen: fix xen_vcpu_info allocation alignment
[ Upstream commit 7bf9a6b46549852a37e6d07e52c601c3c706b562 ] xen_vcpu_info is a percpu area than needs to be mapped by Xen. Currently, it could cross a page boundary resulting in Xen being unable to map it: [ 0.567318] kernel BUG at arch/arm64/xen/../../arm/xen/enlighten.c:164! [ 0.574002] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Fix the issue by using __alloc_percpu and requesting alignment for the memory allocation. Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com> Link: https://lore.kernel.org/r/alpine.DEB.2.22.394.2311221501340.2053963@ubuntu-linux-20-04-desktop Fixes: 24d5373dda7c ("arm/xen: Use alloc_percpu rather than __alloc_percpu") Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 2 additions and 1 deletions
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@ -359,7 +359,8 @@ static int __init xen_guest_init(void)
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* for secondary CPUs as they are brought up.
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* For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
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*/
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xen_vcpu_info = alloc_percpu(struct vcpu_info);
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xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
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1 << fls(sizeof(struct vcpu_info) - 1));
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if (xen_vcpu_info == NULL)
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return -ENOMEM;
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