[xen staging] SVM: sync VM-exit perf counters with known VM-exit reasons

[patchbot@xxxxxxx]

commit fdeaceee7149d173327003156ac1c05863f37fc5
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Feb 24 11:17:26 2022 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Feb 24 11:17:26 2022 +0100

    SVM: sync VM-exit perf counters with known VM-exit reasons
    
    This has gone out of sync over time, resulting in NPF and XSETBV exits
    incrementing the same counter. Introduce a simplistic mechanism to
    hopefully keep things in better sync going forward.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/include/asm/hvm/svm/vmcb.h | 2 ++
 xen/arch/x86/include/asm/perfc_defn.h   | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/include/asm/hvm/svm/vmcb.h 
b/xen/arch/x86/include/asm/hvm/svm/vmcb.h
index ed7cebea71..e87728fa81 100644
--- a/xen/arch/x86/include/asm/hvm/svm/vmcb.h
+++ b/xen/arch/x86/include/asm/hvm/svm/vmcb.h
@@ -302,7 +302,9 @@ enum VMEXIT_EXITCODE
     VMEXIT_MWAIT_CONDITIONAL= 140, /* 0x8c */
     VMEXIT_XSETBV           = 141, /* 0x8d */
     VMEXIT_RDPRU            = 142, /* 0x8e */
+    /* Remember to also update VMEXIT_NPF_PERFC! */
     VMEXIT_NPF              = 1024, /* 0x400, nested paging fault */
+    /* Remember to also update SVM_PERF_EXIT_REASON_SIZE! */
     VMEXIT_INVALID          =  -1
 };
 
diff --git a/xen/arch/x86/include/asm/perfc_defn.h 
b/xen/arch/x86/include/asm/perfc_defn.h
index 896c5397f5..8a31329537 100644
--- a/xen/arch/x86/include/asm/perfc_defn.h
+++ b/xen/arch/x86/include/asm/perfc_defn.h
@@ -11,8 +11,8 @@ PERFCOUNTER_ARRAY(exceptions,           "exceptions", 32)
 PERFCOUNTER_ARRAY(vmexits,              "vmexits", VMX_PERF_EXIT_REASON_SIZE)
 PERFCOUNTER_ARRAY(cause_vector,         "cause vector", VMX_PERF_VECTOR_SIZE)
 
-#define VMEXIT_NPF_PERFC 141
-#define SVM_PERF_EXIT_REASON_SIZE (1+141)
+#define VMEXIT_NPF_PERFC 143
+#define SVM_PERF_EXIT_REASON_SIZE (VMEXIT_NPF_PERFC + 1)
 PERFCOUNTER_ARRAY(svmexits,             "SVMexits", SVM_PERF_EXIT_REASON_SIZE)
 
 #endif /* CONFIG_HVM */
--
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