File 53732f4f-x86-MCE-bypass-uninitialized-vcpu-in-v... of Package xen

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File 53732f4f-x86-MCE-bypass-uninitialized-vcpu-in-vMCE-injection.patch of Package xen (Revision 79cea1abf747b2e33b174bb25b29f240)

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# Commit a07084525c126c596326dc1442dd218f522f51b4
# Date 2014-05-14 10:54:39 +0200
# Author Kai Huang <kai.huang@linux.intel.com>
# Committer Jan Beulich <jbeulich@suse.com>
x86/MCE: bypass uninitialized vcpu in vMCE injection

Dom0 may bring up less number of vCPUs than xen hypervisor actually created for
it, and in this case, on Intel platform, vMCE injection to dom0 will fail due to
injecting vMCE to uninitialized vcpu, and cause dom0 crash.

Signed-off-by: Kai Huang <kai.huang@linux.intel.com>
Acked-by: Christoph Egger <chegger@amazon.de>

--- a/xen/arch/x86/cpu/mcheck/vmce.c
+++ b/xen/arch/x86/cpu/mcheck/vmce.c
@@ -357,6 +357,10 @@ int inject_vmce(struct domain *d, int vc
         if ( vcpu != VMCE_INJECT_BROADCAST && vcpu != v->vcpu_id )
             continue;
 
+        /* Don't inject to uninitialized VCPU. */
+        if ( !v->is_initialised )
+            continue;
+
         if ( (has_hvm_container_domain(d) ||
               guest_has_trap_callback(d, v->vcpu_id, TRAP_machine_check)) &&
              !test_and_set_bool(v->mce_pending) )

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File 53732f4f-x86-MCE-bypass-uninitialized-vcpu-in-vMCE-injection.patch of Package xen (Revision 79cea1abf747b2e33b174bb25b29f240)

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