[Xen-changelog] [xen staging] x86: track when in #MC context

[patchbot@xxxxxxx]

commit 125c582bfdd4b673ee4458b0a41277ae9d52448b
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Wed Feb 26 17:38:11 2020 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Feb 26 17:38:11 2020 +0100

    x86: track when in #MC context
    
    Add helpers to track when executing in #MC handler context. This is
    modeled after the in_irq helpers.
    
    Note that there are no users of in_mce_handler() introduced by the
    change, further users will be added by followup changes.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/cpu/mcheck/mce.c | 2 ++
 xen/include/asm-x86/hardirq.h | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/xen/arch/x86/cpu/mcheck/mce.c b/xen/arch/x86/cpu/mcheck/mce.c
index d61e582af3..e5bd4f542c 100644
--- a/xen/arch/x86/cpu/mcheck/mce.c
+++ b/xen/arch/x86/cpu/mcheck/mce.c
@@ -93,7 +93,9 @@ void x86_mce_vector_register(x86_mce_vector_t hdlr)
 
 void do_machine_check(const struct cpu_user_regs *regs)
 {
+    mce_enter();
     _machine_check_vector(regs);
+    mce_exit();
 }
 
 /*
diff --git a/xen/include/asm-x86/hardirq.h b/xen/include/asm-x86/hardirq.h
index 069e48fce9..276e3419d7 100644
--- a/xen/include/asm-x86/hardirq.h
+++ b/xen/include/asm-x86/hardirq.h
@@ -8,6 +8,7 @@ typedef struct {
        unsigned int __softirq_pending;
        unsigned int __local_irq_count;
        unsigned int nmi_count;
+       unsigned int mce_count;
        bool_t __mwait_wakeup;
 } __cacheline_aligned irq_cpustat_t;
 
@@ -23,6 +24,11 @@ typedef struct {
 #define nmi_enter()            (nmi_count(smp_processor_id())++)
 #define nmi_exit()             (nmi_count(smp_processor_id())--)
 
+#define mce_count(cpu)         __IRQ_STAT(cpu, mce_count)
+#define in_mce_handler()       (mce_count(smp_processor_id()) != 0)
+#define mce_enter()            (mce_count(smp_processor_id())++)
+#define mce_exit()             (mce_count(smp_processor_id())--)
+
 void ack_bad_irq(unsigned int irq);
 
 extern void apic_intr_init(void);
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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