[Xen-changelog] [xen stable-4.4] x86/MCE: bypass uninitialized vcpu in vMCE injection

[patchbot@xxxxxxx]

commit bbb832889206a5029c5813f5f7fda76af96c3acd
Author:     Kai Huang <kai.huang@xxxxxxxxxxxxxxx>
AuthorDate: Fri May 23 15:17:56 2014 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri May 23 15:17:56 2014 +0200

    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@xxxxxxxxxxxxxxx>
    Acked-by: Christoph Egger <chegger@xxxxxxxxx>
    master commit: a07084525c126c596326dc1442dd218f522f51b4
    master date: 2014-05-14 10:54:39 +0200
---
 xen/arch/x86/cpu/mcheck/vmce.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/cpu/mcheck/vmce.c b/xen/arch/x86/cpu/mcheck/vmce.c
index f6c35db..dcfe97e 100644
--- 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 vcpu)
         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) )
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.4

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