[Xen-devel] [RESEND PATCH v2 3/4] xen/mce: always re-initialize 'severity_cpu' in mcheck_cmn_handler()

[Haozhong Zhang <haozhong.zhang@xxxxxxxxx>]

mcheck_cmn_handler() does not always set 'severity_cpu' to override
its value taken from previous rounds of MC handling, which will
interfere the current round of MC handling. Always re-initialize it to
clear the historical value.

Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
---
Reason for resend:
 * Move the re-initialization after its last use, so that we can
   avoid introducing a new mce barrier.
---
 xen/arch/x86/cpu/mcheck/mce.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/cpu/mcheck/mce.c b/xen/arch/x86/cpu/mcheck/mce.c
index a2e9668..0d9d5b0 100644
--- a/xen/arch/x86/cpu/mcheck/mce.c
+++ b/xen/arch/x86/cpu/mcheck/mce.c
@@ -523,6 +523,7 @@ void mcheck_cmn_handler(const struct cpu_user_regs *regs)
             mc_panic(ebuf);
         }
         atomic_set(&found_error, 0);
+        atomic_set(&severity_cpu, -1);
     }
     mce_barrier_exit(&mce_trap_bar);
 
-- 
2.10.1


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