x86/mm: introduce trace point for mmio_ro emulation

Using ptrw_emulation trace point is wrong.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 9aff58a5450debc4be640961c187a948f3ef4e9c..f4b9747abadc4f89a46bfa8cb1cb6166da597d05 100644 (file)
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -5405,7 +5405,7 @@ int mmio_ro_do_page_fault(struct vcpu *v, unsigned long addr,
 
         /* Fallthrough */
     case X86EMUL_RETRY:
-        perfc_incr(ptwr_emulations);
+        perfc_incr(mmio_ro_emulations);
         return EXCRET_fault_fixed;
     }
 

diff --git a/xen/include/asm-x86/perfc_defn.h b/xen/include/asm-x86/perfc_defn.h
index aac93318438dec3bc6a2f0184b969f79eb90a764..6db8746906ddc36f23c312d34200eb6be421bac5 100644 (file)
--- a/xen/include/asm-x86/perfc_defn.h
+++ b/xen/include/asm-x86/perfc_defn.h
@@ -30,6 +30,7 @@ PERFCOUNTER(copy_user_faults,       "copy_user faults")
 
 PERFCOUNTER(map_domain_page_count,  "map_domain_page count")
 PERFCOUNTER(ptwr_emulations,        "writable pt emulations")
+PERFCOUNTER(mmio_ro_emulations,     "mmio ro emulations")
 
 PERFCOUNTER(exception_fixed,        "pre-exception fixed")