[Xen-changelog] [xen staging] x86/nmi: Corrections and improvements to do_nmi_stats()

[patchbot@xxxxxxx]

commit b305fca9a7b3d6cd8673c31be8aa8283ed50ecae
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Feb 13 14:06:50 2020 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Feb 20 18:24:48 2020 +0000

    x86/nmi: Corrections and improvements to do_nmi_stats()
    
    The hardware domain doesn't necessarily have the domid 0.  Render v instead,
    adjusting the strings to avoid printing trailing whitespace.
    
    Rename i to cpu, and use separate booleans for pending/masked.  Drop the
    unnecessary domain local variable.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/nmi.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/xen/arch/x86/nmi.c b/xen/arch/x86/nmi.c
index a5c6bdd0ce..af1d1d52c7 100644
--- a/xen/arch/x86/nmi.c
+++ b/xen/arch/x86/nmi.c
@@ -587,25 +587,24 @@ static void do_nmi_trigger(unsigned char key)
 
 static void do_nmi_stats(unsigned char key)
 {
-    int i;
-    struct domain *d;
-    struct vcpu *v;
+    const struct vcpu *v;
+    unsigned int cpu;
+    bool pend, mask;
 
     printk("CPU\tNMI\n");
-    for_each_online_cpu ( i )
-        printk("%3d\t%3d\n", i, nmi_count(i));
+    for_each_online_cpu ( cpu )
+        printk("%3u\t%3u\n", cpu, nmi_count(cpu));
 
-    if ( ((d = hardware_domain) == NULL) || (d->vcpu == NULL) ||
-         ((v = d->vcpu[0]) == NULL) )
+    if ( !hardware_domain || !(v = domain_vcpu(hardware_domain, 0)) )
         return;
 
-    i = v->async_exception_mask & (1 << VCPU_TRAP_NMI);
-    if ( v->nmi_pending || i )
-        printk("dom0 vpu0: NMI %s%s\n",
-               v->nmi_pending ? "pending " : "",
-               i ? "masked " : "");
+    pend = v->nmi_pending;
+    mask = v->async_exception_mask & (1 << VCPU_TRAP_NMI);
+    if ( pend || mask )
+        printk("%pv: NMI%s%s\n",
+               v, pend ? " pending" : "", mask ? " masked" : "");
     else
-        printk("dom0 vcpu0: NMI neither pending nor masked\n");
+        printk("%pv: NMI neither pending nor masked\n", v);
 }
 
 static __init int register_nmi_trigger(void)
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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