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[linux,v3,5/9] x86/xen: use xen_vcpu_id mapping when pointing vcpu_info to the shared_info page

Message ID 1469536228-29932-6-git-send-email-vkuznets@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Vitaly Kuznetsov July 26, 2016, 12:30 p.m. UTC 
shared_info page has space for 32 vcpu info slots for first 32 vCPUs but
these are the first 32 vCPUs from Xen's perspective and we should map them
accordingly with the newly introduced xen_vcpu_id mapping.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
Changes since v1:
- Use xen_vcpu_nr() helper [David Vrabel]
---
 arch/x86/xen/enlighten.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
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Patch

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 3b0ceed..c650677 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -207,8 +207,9 @@  static void xen_vcpu_setup(int cpu)
 		if (per_cpu(xen_vcpu, cpu) == &per_cpu(xen_vcpu_info, cpu))
 			return;
 	}
-	if (cpu < MAX_VIRT_CPUS)
-		per_cpu(xen_vcpu,cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
+	if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
+		per_cpu(xen_vcpu, cpu) =
+			&HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
 
 	if (!have_vcpu_info_placement) {
 		if (cpu >= MAX_VIRT_CPUS)
@@ -1781,9 +1782,10 @@  void __ref xen_hvm_init_shared_info(void)
 	 * in that case multiple vcpus might be online. */
 	for_each_online_cpu(cpu) {
 		/* Leave it to be NULL. */
-		if (cpu >= MAX_VIRT_CPUS)
+		if (xen_vcpu_nr(cpu) >= MAX_VIRT_CPUS)
 			continue;
-		per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
+		per_cpu(xen_vcpu, cpu) =
+			&HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
 	}
 }