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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2013-05-05 09:24:07 -0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2013-05-08 08:38:08 -0400
commitd5b17dbff83d63fb6bf35daec21c8ebfb8d695b5 (patch)
tree0367b7d153610ad997a8b2b8d75ee84fdea4f441 /arch/x86
parenta520996ae2e2792e1f90b74e67c974120c8a3b83 (diff)
xen/smp/pvhvm: Don't point per_cpu(xen_vpcu, 33 and larger) to shared_info
As it will point to some data, but not event channel data (the shared_info has an array limited to 32). This means that for PVHVM guests with more than 32 VCPUs without the usage of VCPUOP_register_info any interrupts to VCPUs larger than 32 would have gone unnoticed during early bootup. That is OK, as during early bootup, in smp_init we end up calling the hotplug mechanism (xen_hvm_cpu_notify) which makes the VCPUOP_register_vcpu_info call for all VCPUs and we can receive interrupts on VCPUs 33 and further. This is just a cleanup. Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/xen/enlighten.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index a2babdb13a26..31e19f97fb5a 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1646,6 +1646,9 @@ void __ref xen_hvm_init_shared_info(void)
* online but xen_hvm_init_shared_info is run at resume time too and
* in that case multiple vcpus might be online. */
for_each_online_cpu(cpu) {
+ /* Leave it to be NULL. */
+ if (cpu >= MAX_VIRT_CPUS)
+ continue;
per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
}
}