[PATCH] xen: vcpu_info reinit error after hold/release if VM has multi-cpu

From: Ouyang Zhaowei (Charles)
Date: Mon Mar 30 2015 - 09:33:59 EST


If the VM has multi-cpu the vcpu_info of cpu0 is the member of the structure HYPERVISOR_shared_info,
and the others is not, but after hold/release the VM, the vcpu_info will be reinitialized,
the vcpu_info of all the vcpus will be considered as the member of HYPERVISOR_shared_info.
This will cause the cpu1 and other cpu keep receiving interrupts, and the cpu0 is waiting them to
finish the job.
So we do not reinit the vcpu_info if it's doing hold/release.

Signed-off-by: Charles Ouyang <ouyangzhaowei@xxxxxxxxxx>
---
arch/x86/xen/suspend.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
index c4df9db..832480c 100644
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -32,7 +32,8 @@ static void xen_hvm_post_suspend(int suspend_cancelled)
{
#ifdef CONFIG_XEN_PVHVM
int cpu;
- xen_hvm_init_shared_info();
+ if (!suspend_cancelled)
+ xen_hvm_init_shared_info();
xen_callback_vector();
xen_unplug_emulated_devices();
if (xen_feature(XENFEAT_hvm_safe_pvclock)) {

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