From: Keir Fraser <keir.fraser@citrix.com>
Date: Mon, 22 Dec 2008 13:43:13 +0000 (+0000)
Subject: shadow: Remove warnings about writes to read-only BIOS area. These
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14026^2~1
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=1f95053ea5f0845fd0416e91d8d3d92671ea6610;p=xen.git

shadow: Remove warnings about writes to read-only BIOS area. These
attempts can be legitimate.

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
---

diff --git a/xen/arch/x86/mm/shadow/multi.c b/xen/arch/x86/mm/shadow/multi.c
index 22529b4041..791669e6b6 100644
--- a/xen/arch/x86/mm/shadow/multi.c
+++ b/xen/arch/x86/mm/shadow/multi.c
@@ -3228,16 +3228,9 @@ static int sh_page_fault(struct vcpu *v,
         goto mmio;
     }
 
-    /* Log attempts to write to read-only memory */
+    /* Ignore attempts to write to read-only memory. */
     if ( (p2mt == p2m_ram_ro) && (ft == ft_demand_write) )
-    {
-        static unsigned long lastpage = 0;
-        if ( xchg(&lastpage, va & PAGE_MASK) != (va & PAGE_MASK) )
-            gdprintk(XENLOG_DEBUG, "guest attempted write to read-only memory"
-                     " page. va page=%#lx, mfn=%#lx\n",
-                     va & PAGE_MASK, mfn_x(gmfn));
         goto emulate_readonly; /* skip over the instruction */
-    }
 
     /* In HVM guests, we force CR0.WP always to be set, so that the
      * pagetables are always write-protected.  If the guest thinks