[Xen-devel] [v2 05/11] vmx: add new data structure member to support PML

[Kai Huang <kai.huang@xxxxxxxxxxxxxxx>]

A new 4K page pointer is added to arch_vmx_struct as PML buffer for vcpu. And a
new 'status' field is added to vmx_domain to indicate whether PML is enabled for
the domain or not. The 'status' field also can be used for further similiar
purpose.

Note both new members don't have to be initialized to zero explicitly as both
vcpu and domain structure are zero-ed when they are created.

Signed-off-by: Kai Huang <kai.huang@xxxxxxxxxxxxxxx>
---
 xen/include/asm-x86/hvm/vmx/vmcs.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
b/xen/include/asm-x86/hvm/vmx/vmcs.h
index f831a78..2c679ac 100644
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
@@ -70,8 +70,12 @@ struct ept_data {
     cpumask_var_t synced_mask;
 };
 
+#define _VMX_DOMAIN_PML_ENABLED    0
+#define VMX_DOMAIN_PML_ENABLED     (1ul << _VMX_DOMAIN_PML_ENABLED)
 struct vmx_domain {
     unsigned long apic_access_mfn;
+    /* VMX_DOMAIN_* */
+    unsigned long status;
 };
 
 struct pi_desc {
@@ -142,6 +146,9 @@ struct arch_vmx_struct {
     /* Bitmap to control vmexit policy for Non-root VMREAD/VMWRITE */
     struct page_info     *vmread_bitmap;
     struct page_info     *vmwrite_bitmap;
+
+#define NR_PML_ENTRIES   512
+    struct page_info     *pml_pg;
 };
 
 int vmx_create_vmcs(struct vcpu *v);
-- 
2.1.0


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