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). Per Tim's suggestion, I also add an
assertion check in shadow/common.c file to prevent affecting shadow code.
Signed-off-by: Wei Huang <wei.huang2@xxxxxxx>
Acked-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
Acked-by: Tim Deegan <tim.deegan@xxxxxxxxxx>
# HG changeset patch
# User root@xxxxxxxxxxxxxxxxxxx
# Date 1270220684 18000
# Node ID ab6294d72808fcb933e7a53953476c294a6163eb
# Parent c2375d0545b72f1ba83072c502b6c437fbdc9770
add new IOMMU options
diff -r c2375d0545b7 -r ab6294d72808 xen/arch/x86/hvm/svm/svm.c
--- a/xen/arch/x86/hvm/svm/svm.c Fri Apr 02 10:04:06 2010 -0500
+++ b/xen/arch/x86/hvm/svm/svm.c Fri Apr 02 10:04:44 2010 -0500
@@ -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 c2375d0545b7 -r ab6294d72808 xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c Fri Apr 02 10:04:06 2010 -0500
+++ b/xen/arch/x86/hvm/vmx/vmx.c Fri Apr 02 10:04:44 2010 -0500
@@ -1445,6 +1445,8 @@
if ( cpu_has_vmx_ept )
vmx_function_table.hap_supported = 1;
+
+ vmx_function_table.hap_1gb_pgtb = 0;
setup_vmcs_dump();
diff -r c2375d0545b7 -r ab6294d72808 xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c Fri Apr 02 10:04:06 2010 -0500
+++ b/xen/arch/x86/mm/p2m.c Fri Apr 02 10:04:44 2010 -0500
@@ -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...) \
@@ -1740,9 +1744,9 @@
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 c2375d0545b7 -r ab6294d72808 xen/arch/x86/mm/shadow/common.c
--- a/xen/arch/x86/mm/shadow/common.c Fri Apr 02 10:04:06 2010 -0500
+++ b/xen/arch/x86/mm/shadow/common.c Fri Apr 02 10:04:44 2010 -0500
@@ -3452,6 +3452,11 @@
{
struct domain *d = v->domain;
+ /* The following assertion is to make sure we don't step on 1GB host
+ * page support of HVM guest. */
+ ASSERT(!(level > 2 && (l1e_get_flags(*p) & _PAGE_PRESENT) &&
+ (l1e_get_flags(*p) & _PAGE_PSE)));
+
/* If we're removing an MFN from the p2m, remove it from the shadows too */
if ( level == 1 )
{
diff -r c2375d0545b7 -r ab6294d72808 xen/include/asm-x86/hvm/hvm.h
--- a/xen/include/asm-x86/hvm/hvm.h Fri Apr 02 10:04:06 2010 -0500
+++ b/xen/include/asm-x86/hvm/hvm.h Fri Apr 02 10:04:44 2010 -0500
@@ -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
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