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 <[email protected]> Link: https://lore.kernel.org/r/alpine.DEB.2.22.394.2311221501340.2053963@ubuntu-linux-20-04-desktop Fixes: 24d5373 ("arm/xen: Use alloc_percpu rather than __alloc_percpu") Reviewed-by: Juergen Gross <[email protected]> Signed-off-by: Juergen Gross <[email protected]>
DatumSystems · Nov 23, 2023 · 7bf9a6b · 7bf9a6b
1 parent 295b202
commit 7bf9a6b
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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;