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

[patchbot@xxxxxxx]

commit c5539e6e7b9e9f8e12d4e05b5f6db97ca94539e7
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Jan 31 10:56:28 2022 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jan 31 10:56:28 2022 +0100

    VMX: sync VM-exit perf counters with known VM-exit reasons
    
    This has gone out of sync over time. Introduce a simplistic mechanism to
    hopefully keep things in sync going forward.
    
    Also limit the array index to just the "basic exit reason" part, which is
    what the pseudo-enumeration covers.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmx.c             | 2 +-
 xen/arch/x86/include/asm/hvm/vmx/vmx.h | 1 +
 xen/arch/x86/include/asm/perfc_defn.h  | 2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 9765cfd90a..36c8a12cfe 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -3928,7 +3928,7 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
     else
         HVMTRACE_ND(VMEXIT, 0, 1/*cycles*/, exit_reason, regs->eip);
 
-    perfc_incra(vmexits, exit_reason);
+    perfc_incra(vmexits, (uint16_t)exit_reason);
 
     /* Handle the interrupt we missed before allowing any more in. */
     switch ( (uint16_t)exit_reason )
diff --git a/xen/arch/x86/include/asm/hvm/vmx/vmx.h 
b/xen/arch/x86/include/asm/hvm/vmx/vmx.h
index 85530d2e0e..97e7652aa1 100644
--- a/xen/arch/x86/include/asm/hvm/vmx/vmx.h
+++ b/xen/arch/x86/include/asm/hvm/vmx/vmx.h
@@ -219,6 +219,7 @@ static inline void pi_clear_sn(struct pi_desc *pi_desc)
 #define EXIT_REASON_PML_FULL            62
 #define EXIT_REASON_XSAVES              63
 #define EXIT_REASON_XRSTORS             64
+/* Remember to also update VMX_PERF_EXIT_REASON_SIZE! */
 
 /*
  * Interruption-information format
diff --git a/xen/arch/x86/include/asm/perfc_defn.h 
b/xen/arch/x86/include/asm/perfc_defn.h
index a98df515d9..896c5397f5 100644
--- a/xen/arch/x86/include/asm/perfc_defn.h
+++ b/xen/arch/x86/include/asm/perfc_defn.h
@@ -6,7 +6,7 @@ PERFCOUNTER_ARRAY(exceptions,           "exceptions", 32)
 
 #ifdef CONFIG_HVM
 
-#define VMX_PERF_EXIT_REASON_SIZE 56
+#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)
--
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