[xen staging] x86/traps: Collect PERFC_exceptions stats for IST vectors too

[patchbot@xxxxxxx]

commit d9f60a924c03761081b99145a51bc85ee54efcdc
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Oct 8 10:47:07 2021 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Mon Nov 29 13:53:05 2021 +0000

    x86/traps: Collect PERFC_exceptions stats for IST vectors too
    
    This causes NMIs, #DB and #MC to be counted, rather than being reported as 
0.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/x86_64/entry.S | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/xen/arch/x86/x86_64/entry.S b/xen/arch/x86/x86_64/entry.S
index d5998acf88..3caa565476 100644
--- a/xen/arch/x86/x86_64/entry.S
+++ b/xen/arch/x86/x86_64/entry.S
@@ -1005,6 +1005,13 @@ handle_ist_exception:
 #endif
         movq  %rsp,%rdi
         movzbl UREGS_entry_vector(%rsp),%eax
+
+#ifdef CONFIG_PERF_COUNTERS
+        lea   per_cpu__perfcounters(%rip), %rcx
+        add   STACK_CPUINFO_FIELD(per_cpu_offset)(%r14), %rcx
+        incl  ASM_PERFC_exceptions * 4(%rcx, %rax, 4)
+#endif
+
         leaq  exception_table(%rip),%rdx
         mov   (%rdx, %rax, 8), %rdx
         INDIRECT_CALL %rdx
--
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