[xen master] x86/perfc: fold HVM's VM-exit counter arrays

[patchbot@xxxxxxx]

commit 81c416dca231d2292f52690adc64921e233bacd9
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Feb 24 11:19:06 2022 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Feb 24 11:19:06 2022 +0100

    x86/perfc: fold HVM's VM-exit counter arrays
    
    Only one of them can be in use at a time, so make the whole set union-
    like. While doing the rename in SVM code, combine the two perf_incra(),
    generalizing the range upwards of VMEXIT_NPF.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/hvm/svm/svm.c            |  6 ++++--
 xen/arch/x86/include/asm/perfc_defn.h | 10 +++++-----
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index 8869a5de62..64a45045da 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -2691,7 +2691,10 @@ void svm_vmexit_handler(struct cpu_user_regs *regs)
         goto out;
     }
 
-    perfc_incra(svmexits, exit_reason);
+    perfc_incra(vmexits,
+                exit_reason < VMEXIT_NPF
+                ? exit_reason
+                : exit_reason - VMEXIT_NPF + VMEXIT_NPF_PERFC);
 
     hvm_maybe_deassert_evtchn_irq();
 
@@ -3020,7 +3023,6 @@ void svm_vmexit_handler(struct cpu_user_regs *regs)
         break;
 
     case VMEXIT_NPF:
-        perfc_incra(svmexits, VMEXIT_NPF_PERFC);
         if ( cpu_has_svm_decode )
             v->arch.hvm.svm.cached_insn_len = vmcb->guest_ins_len & 0xf;
         rc = vmcb->exitinfo1 & PFEC_page_present
diff --git a/xen/arch/x86/include/asm/perfc_defn.h 
b/xen/arch/x86/include/asm/perfc_defn.h
index 8a31329537..b07063b7d8 100644
--- a/xen/arch/x86/include/asm/perfc_defn.h
+++ b/xen/arch/x86/include/asm/perfc_defn.h
@@ -7,13 +7,13 @@ PERFCOUNTER_ARRAY(exceptions,           "exceptions", 32)
 #ifdef CONFIG_HVM
 
 #define VMX_PERF_EXIT_REASON_SIZE 65
-#define VMX_PERF_VECTOR_SIZE 0x20
-PERFCOUNTER_ARRAY(vmexits,              "vmexits", VMX_PERF_EXIT_REASON_SIZE)
-PERFCOUNTER_ARRAY(cause_vector,         "cause vector", VMX_PERF_VECTOR_SIZE)
-
 #define VMEXIT_NPF_PERFC 143
 #define SVM_PERF_EXIT_REASON_SIZE (VMEXIT_NPF_PERFC + 1)
-PERFCOUNTER_ARRAY(svmexits,             "SVMexits", SVM_PERF_EXIT_REASON_SIZE)
+PERFCOUNTER_ARRAY(vmexits,              "vmexits",
+                  MAX(VMX_PERF_EXIT_REASON_SIZE, SVM_PERF_EXIT_REASON_SIZE))
+
+#define VMX_PERF_VECTOR_SIZE 0x20
+PERFCOUNTER_ARRAY(cause_vector,         "cause vector", VMX_PERF_VECTOR_SIZE)
 
 #endif /* CONFIG_HVM */
 
--
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