From: Keir Fraser <keir.fraser@citrix.com>
Date: Tue, 8 Jan 2008 09:57:59 +0000 (+0000)
Subject: x86, hvm: Add a perf counter for CR0.WP=0 emulation.
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14445^2~71
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https:/%22bookmarks://%22/%22http:/www.example.com/cgi/%22https:/%22bookmarks:/%22?a=commitdiff_plain;h=c741a6246754635ac808b74ee5b0bd51bdfccaa8;p=xen.git

x86, hvm: Add a perf counter for CR0.WP=0 emulation.
Signed-off-by Kevin Tian <kevin.tian@intel.com>
---

diff --git a/xen/arch/x86/mm/shadow/multi.c b/xen/arch/x86/mm/shadow/multi.c
index 4777e54080..1c4e7fad70 100644
--- a/xen/arch/x86/mm/shadow/multi.c
+++ b/xen/arch/x86/mm/shadow/multi.c
@@ -2899,7 +2899,10 @@ static int sh_page_fault(struct vcpu *v,
     if ( is_hvm_domain(d) 
          && unlikely(!hvm_wp_enabled(v)) 
          && regs->error_code == (PFEC_write_access|PFEC_page_present) )
+    {
+        perfc_incr(shadow_fault_emulate_wp);
         goto emulate;
+    }
 
     perfc_incr(shadow_fault_fixed);
     d->arch.paging.log_dirty.fault_count++;
diff --git a/xen/include/asm-x86/perfc_defn.h b/xen/include/asm-x86/perfc_defn.h
index eb18b5fe38..460c1f2b58 100644
--- a/xen/include/asm-x86/perfc_defn.h
+++ b/xen/include/asm-x86/perfc_defn.h
@@ -56,6 +56,7 @@ PERFCOUNTER(shadow_fault_emulate_read, "shadow_fault emulates a read")
 PERFCOUNTER(shadow_fault_emulate_write, "shadow_fault emulates a write")
 PERFCOUNTER(shadow_fault_emulate_failed, "shadow_fault emulator fails")
 PERFCOUNTER(shadow_fault_emulate_stack, "shadow_fault emulate stack write")
+PERFCOUNTER(shadow_fault_emulate_wp, "shadow_fault emulate for CR0.WP=0")
 PERFCOUNTER(shadow_fault_mmio,     "shadow_fault handled as mmio")
 PERFCOUNTER(shadow_fault_fixed,    "shadow_fault fixed fault")
 PERFCOUNTER(shadow_ptwr_emulate,   "shadow causes ptwr to emulate")