summaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
authorStefano Stabellini <sstabellini@kernel.org>2023-11-22 15:07:41 -0800
committerJuergen Gross <jgross@suse.com>2023-11-23 09:32:41 +0100
commit7bf9a6b46549852a37e6d07e52c601c3c706b562 (patch)
treea4dd39811c00d28ddb7dfafd4eb06a018dab2aa4 /arch
parent295b202227e98edb2fb5cc29b6ec4b96b2792d9c (diff)
arm/xen: fix xen_vcpu_info allocation alignment
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/xen/enlighten.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 9afdc4c4a5dc..a395b6c0aae2 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -484,7 +484,8 @@ static int __init xen_guest_init(void)
* for secondary CPUs as they are brought up.
* For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
*/
- xen_vcpu_info = alloc_percpu(struct vcpu_info);
+ xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
+ 1 << fls(sizeof(struct vcpu_info) - 1));
if (xen_vcpu_info == NULL)
return -ENOMEM;