From: Konrad Rzeszutek Wilk Date: Sun, 5 May 2013 13:24:07 +0000 (-0400) Subject: xen/smp/pvhvm: Don't point per_cpu(xen_vpcu, 33 and larger) to shared_info X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d5b17dbff83d63fb6bf35daec21c8ebfb8d695b5;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: Konrad Rzeszutek Wilk --- 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]; } }