[Xen-devel] [PATCH] Support mce logging left over from previous reset in Dom0.

["SUZUKI, Kazuhiro" <kaz@xxxxxxxxxxxxxx>]

Hi,

The attached patch set supports machine check logging left over from
previous reset in Dom0 boot up stage.

enable_mce_log_at_boot-xen.patch:       xen part
enable_mce_log_at_boot-linux.patch:     linux-2.6.18.8 dom0 part
enable_mce_log_at_boot-pvops.patch:     pvos dom0 part

Thanks,
KAZ

Signed-off-by: Kazuhiro Suzuki <kaz@xxxxxxxxxxxxxx>

diff -r 623aa5c2eaa4 xen/arch/x86/cpu/mcheck/mce_intel.c
--- a/xen/arch/x86/cpu/mcheck/mce_intel.c       Fri Sep 25 15:20:58 2009 +0100
+++ b/xen/arch/x86/cpu/mcheck/mce_intel.c       Mon Sep 28 11:14:01 2009 +0900
@@ -1029,10 +1029,10 @@
 
     mctc = mcheck_mca_logout(MCA_RESET, mca_allbanks, &bs, NULL);
 
-    /* in the boot up stage, don't inject to DOM0, but print out */
+    /* in the boot up stage, print out and also log in DOM0 boot process */
     if (bs.errcnt && mctc != NULL) {
         x86_mcinfo_dump(mctelem_dataptr(mctc));
-        mctelem_dismiss(mctc);
+        mctelem_commit(mctc);
     }
 
     set_in_cr4(X86_CR4_MCE);

diff -r f1a207ccb493 arch/x86_64/kernel/mce_dom0.c
--- a/arch/x86_64/kernel/mce_dom0.c     Sun Aug 30 08:54:15 2009 +0100
+++ b/arch/x86_64/kernel/mce_dom0.c     Mon Sep 28 11:14:25 2009 +0900
@@ -127,5 +127,8 @@
        g_mi = kmalloc(sizeof(struct mc_info), GFP_KERNEL);
        if (ret < 0)
                printk(KERN_ERR "MCE_DOM0_LOG: bind_virq for DOM0 failed\n");
+
+       /* Log the machine checks left over from the previous reset. */
+       mce_dom0_interrupt(VIRQ_MCA, NULL, NULL);
 }
 

diff --git a/drivers/xen/mce.c b/drivers/xen/mce.c
index b354dc8..b2e08a0 100644
--- a/drivers/xen/mce.c
+++ b/drivers/xen/mce.c
@@ -189,6 +189,8 @@ static int bind_virq_for_mce(void)
                return ret;
        }
 
+       /* Log the machine checks left over from the previous reset. */
+       mce_dom_interrupt(VIRQ_MCA, NULL);
        return 0;
 }
 

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