diff options
| author | Dongxiao Xu <dongxiao.xu@intel.com> | 2013-01-25 10:19:55 +0100 |
|---|---|---|
| committer | Dongxiao Xu <dongxiao.xu@intel.com> | 2013-01-25 10:19:55 +0100 |
| commit | 15e64e205e121c1eb18b6a9c1953c82443e4cd5a (patch) | |
| tree | c5c38470c62e0b3e45aae5e38727d55386485bc4 /xen/include/asm-x86/hvm/vmx | |
| parent | ddddba4388aa342da48045da253155db73f2daac (diff) | |
| download | xen-15e64e205e121c1eb18b6a9c1953c82443e4cd5a.tar.gz xen-15e64e205e121c1eb18b6a9c1953c82443e4cd5a.tar.bz2 xen-15e64e205e121c1eb18b6a9c1953c82443e4cd5a.zip | |
nested vmx: enable VMCS shadowing feature
The current logic for handling the non-root VMREAD/VMWRITE is by
VM-Exit and emulate, which may bring certain overhead.
On new Intel platform, it introduces a new feature called VMCS
shadowing, where non-root VMREAD/VMWRITE will not trigger VM-Exit,
and the hardware will read/write the virtual VMCS instead.
This is proved to have performance improvement with the feature.
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Acked-by: Jun Nakajima <jun.nakajima@intel.com>
Acked-by Eddie Dong <eddie.dong@intel.com>
Committed-by: Jan Beulich <jbeulich@suse.com>
Diffstat (limited to 'xen/include/asm-x86/hvm/vmx')
| -rw-r--r-- | xen/include/asm-x86/hvm/vmx/vmcs.h | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h b/xen/include/asm-x86/hvm/vmx/vmcs.h index 652dc21e1c..ba0222172a 100644 --- a/xen/include/asm-x86/hvm/vmx/vmcs.h +++ b/xen/include/asm-x86/hvm/vmx/vmcs.h @@ -81,6 +81,8 @@ struct vmx_domain { struct arch_vmx_struct { /* Virtual address of VMCS. */ struct vmcs_struct *vmcs; + /* VMCS shadow machine address. */ + paddr_t vmcs_shadow_maddr; /* Protects remote usage of VMCS (VMPTRLD/VMCLEAR). */ spinlock_t vmcs_lock; @@ -125,6 +127,10 @@ struct arch_vmx_struct { /* Remember EFLAGS while in virtual 8086 mode */ uint32_t vm86_saved_eflags; int hostenv_migrated; + + /* Bitmap to control vmexit policy for Non-root VMREAD/VMWRITE */ + struct page_info *vmread_bitmap; + struct page_info *vmwrite_bitmap; }; int vmx_create_vmcs(struct vcpu *v); @@ -191,6 +197,7 @@ extern u32 vmx_vmentry_control; #define SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY 0x00000200 #define SECONDARY_EXEC_PAUSE_LOOP_EXITING 0x00000400 #define SECONDARY_EXEC_ENABLE_INVPCID 0x00001000 +#define SECONDARY_EXEC_ENABLE_VMCS_SHADOWING 0x00004000 extern u32 vmx_secondary_exec_control; extern bool_t cpu_has_vmx_ins_outs_instr_info; @@ -205,6 +212,8 @@ extern bool_t cpu_has_vmx_ins_outs_instr_info; #define VMX_EPT_INVEPT_SINGLE_CONTEXT 0x02000000 #define VMX_EPT_INVEPT_ALL_CONTEXT 0x04000000 +#define VMX_MISC_VMWRITE_ALL 0x20000000 + #define VMX_VPID_INVVPID_INSTRUCTION 0x100000000ULL #define VMX_VPID_INVVPID_INDIVIDUAL_ADDR 0x10000000000ULL #define VMX_VPID_INVVPID_SINGLE_CONTEXT 0x20000000000ULL @@ -244,7 +253,10 @@ extern bool_t cpu_has_vmx_ins_outs_instr_info; (vmx_secondary_exec_control & SECONDARY_EXEC_APIC_REGISTER_VIRT) #define cpu_has_vmx_virtual_intr_delivery \ (vmx_secondary_exec_control & SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY) -#define cpu_has_vmx_vmcs_shadowing 0 +#define cpu_has_vmx_vmcs_shadowing \ + (vmx_secondary_exec_control & SECONDARY_EXEC_ENABLE_VMCS_SHADOWING) + +#define VMCS_RID_TYPE_MASK 0x80000000 /* GUEST_INTERRUPTIBILITY_INFO flags. */ #define VMX_INTR_SHADOW_STI 0x00000001 @@ -305,6 +317,10 @@ enum vmcs_field { EOI_EXIT_BITMAP2_HIGH = 0x00002021, EOI_EXIT_BITMAP3 = 0x00002022, EOI_EXIT_BITMAP3_HIGH = 0x00002023, + VMREAD_BITMAP = 0x00002026, + VMREAD_BITMAP_HIGH = 0x00002027, + VMWRITE_BITMAP = 0x00002028, + VMWRITE_BITMAP_HIGH = 0x00002029, GUEST_PHYSICAL_ADDRESS = 0x00002400, GUEST_PHYSICAL_ADDRESS_HIGH = 0x00002401, VMCS_LINK_POINTER = 0x00002800, |