WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] [PATCH][4/4] Enable 1GB for Xen HVM host page

To: "'xen-devel@xxxxxxxxxxxxxxxxxxx'" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>
Subject: [Xen-devel] [PATCH][4/4] Enable 1GB for Xen HVM host page
From: Wei Huang <wei.huang2@xxxxxxx>
Date: Mon, 22 Feb 2010 11:19:28 -0600
Cc:
Delivery-date: Mon, 22 Feb 2010 09:28:38 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Thunderbird 2.0.0.17 (X11/20080914)
This patch adds a new field in hvm to indicate 1gb is supported by CPU. In addition, users can turn 1GB feature on/off using a Xen option ("hap_1gb", default is off).

Signed-off-by: Wei Huang <wei.huang2@xxxxxxx>
Acked-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>

# HG changeset patch
# User huangwei@xxxxxxxxxxxxxxxx
# Date 1266853456 21600
# Node ID 6849ef364858d422c5cb86e3ce49d63cbc897579
# Parent  72075d4fc39e8cd11a06bff4eb66521ab8fe952b
add option to turn on and off 1GB

diff -r 72075d4fc39e -r 6849ef364858 xen/arch/x86/hvm/svm/svm.c
--- a/xen/arch/x86/hvm/svm/svm.c        Mon Feb 22 09:44:13 2010 -0600
+++ b/xen/arch/x86/hvm/svm/svm.c        Mon Feb 22 09:44:16 2010 -0600
@@ -883,6 +883,8 @@
                          cpuid_edx(0x8000000A) : 0);
 
     svm_function_table.hap_supported = cpu_has_svm_npt;
+    svm_function_table.hap_1gb_pgtb = 
+        (CONFIG_PAGING_LEVELS == 4)? !!(cpuid_edx(0x80000001) & 0x04000000):0;
 
     hvm_enable(&svm_function_table);
 }
diff -r 72075d4fc39e -r 6849ef364858 xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c        Mon Feb 22 09:44:13 2010 -0600
+++ b/xen/arch/x86/hvm/vmx/vmx.c        Mon Feb 22 09:44:16 2010 -0600
@@ -1443,6 +1443,8 @@
 
     if ( cpu_has_vmx_ept )
         vmx_function_table.hap_supported = 1;
+    
+    vmx_function_table.hap_1gb_pgtb = 0;
 
     setup_vmcs_dump();
 
diff -r 72075d4fc39e -r 6849ef364858 xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c     Mon Feb 22 09:44:13 2010 -0600
+++ b/xen/arch/x86/mm/p2m.c     Mon Feb 22 09:44:16 2010 -0600
@@ -38,6 +38,10 @@
 /* Debugging and auditing of the P2M code? */
 #define P2M_AUDIT     0
 #define P2M_DEBUGGING 0
+
+/* turn on/off 1GB host page table support for hap */
+static int opt_hap_1gb = 0;
+boolean_param("hap_1gb", opt_hap_1gb);
 
 /* Printouts */
 #define P2M_PRINTK(_f, _a...)                                \
@@ -1735,9 +1739,9 @@
     while ( todo )
     {
         if ( is_hvm_domain(d) && d->arch.hvm_domain.hap_enabled )
-            order = ( (((gfn | mfn_x(mfn) | todo) & ((1ul << 18) - 1)) == 0) ) 
?
-                    18 :
-                    (((gfn | mfn_x(mfn) | todo) & ((1ul << 9) - 1)) == 0) ? 9 
: 0;
+            order = ( (((gfn | mfn_x(mfn) | todo) & ((1ul << 18) - 1)) == 0) &&
+                      hvm_funcs.hap_1gb_pgtb && opt_hap_1gb ) ? 18 :
+                (((gfn | mfn_x(mfn) | todo) & ((1ul << 9) - 1)) == 0) ? 9 : 0;
 
         else
             order = 0;
diff -r 72075d4fc39e -r 6849ef364858 xen/include/asm-x86/hvm/hvm.h
--- a/xen/include/asm-x86/hvm/hvm.h     Mon Feb 22 09:44:13 2010 -0600
+++ b/xen/include/asm-x86/hvm/hvm.h     Mon Feb 22 09:44:16 2010 -0600
@@ -68,6 +68,10 @@
 
     /* Support Hardware-Assisted Paging? */
     int hap_supported;
+
+    /* Support 1GB Harware-Assisted Paging? */
+    int hap_1gb_pgtb;
+
 
     /*
      * Initialise/destroy HVM domain/vcpu resources
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
<Prev in Thread] Current Thread [Next in Thread>
  • [Xen-devel] [PATCH][4/4] Enable 1GB for Xen HVM host page, Wei Huang <=