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authorVitaly Kuznetsov <vkuznets@redhat.com>2016-06-30 18:56:38 +0300
committerDavid Vrabel <david.vrabel@citrix.com>2016-07-25 15:32:34 +0300
commitad5475f9faf5186b7f59de2c6481ee3e211f1ed7 (patch)
treedc9c373319bc1f1927ce10d8937292c17af217ed /arch/arm/xen
parent88e957d6e47f1232ad15b21e54a44f1147ea8c1b (diff)
downloadlinux-ad5475f9faf5186b7f59de2c6481ee3e211f1ed7.tar.xz
x86/xen: use xen_vcpu_id mapping for HYPERVISOR_vcpu_op
HYPERVISOR_vcpu_op() passes Linux's idea of vCPU id as a parameter while Xen's idea is expected. In some cases these ideas diverge so we need to do remapping. Convert all callers of HYPERVISOR_vcpu_op() to use xen_vcpu_nr(). Leave xen_fill_possible_map() and xen_filter_cpu_maps() intact as they're only being called by PV guests before perpu areas are initialized. While the issue could be solved by switching to early_percpu for xen_vcpu_id I think it's not worth it: PV guests will probably never get to the point where their idea of vCPU id diverges from Xen's. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'arch/arm/xen')
-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 72cf06bf43f2..0bea3d271f6e 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -177,7 +177,8 @@ static void xen_percpu_init(void)
info.mfn = virt_to_gfn(vcpup);
info.offset = xen_offset_in_page(vcpup);
- err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
+ err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
+ &info);
BUG_ON(err);
per_cpu(xen_vcpu, cpu) = vcpup;