[PATCH RFC 2/7] KVM: nVMX: modify vmcs12 fields to match Hyper-V enlightened VMCS

[Vitaly Kuznetsov <vkuznets@redhat.com>]

From: Ladi Prosek <lprosek@redhat.com>

Reorders existing fields and adds fields specific to Hyper-V. The layout
now matches Hyper-V TLFS 5.0b 16.11.2 Enlightened VMCS.

Fields used by KVM but missing from Hyper-V are placed in the second half
of the VMCS page to minimize the chances they will clash with future
enlightened VMCS versions.

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
[Vitaly]: Update VMCS12_REVISION to some new arbitrary number.
---
 arch/x86/kvm/vmx.c | 321 +++++++++++++++++++++++++++++++----------------------
 1 file changed, 187 insertions(+), 134 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 8eba631c4dbd..cd5f29a57880 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -239,159 +239,212 @@ struct __packed vmcs12 {
 	u32 revision_id;
 	u32 abort;
 
+	union {
+		u64 hv_vmcs[255];
+		struct {
+			u16 host_es_selector;
+			u16 host_cs_selector;
+			u16 host_ss_selector;
+			u16 host_ds_selector;
+			u16 host_fs_selector;
+			u16 host_gs_selector;
+			u16 host_tr_selector;
+
+			u64 host_ia32_pat;
+			u64 host_ia32_efer;
+
+			/*
+			 * To allow migration of L1 (complete with its L2
+			 * guests) between machines of different natural widths
+			 * (32 or 64 bit), we cannot have unsigned long fields
+			 * with no explicit size. We use u64 (aliased
+			 * natural_width) instead. Luckily, x86 is
+			 * little-endian.
+			 */
+			natural_width host_cr0;
+			natural_width host_cr3;
+			natural_width host_cr4;
+
+			natural_width host_ia32_sysenter_esp;
+			natural_width host_ia32_sysenter_eip;
+			natural_width host_rip;
+			u32 host_ia32_sysenter_cs;
+
+			u32 pin_based_vm_exec_control;
+			u32 vm_exit_controls;
+			u32 secondary_vm_exec_control;
+
+			u64 io_bitmap_a;
+			u64 io_bitmap_b;
+			u64 msr_bitmap;
+
+			u16 guest_es_selector;
+			u16 guest_cs_selector;
+			u16 guest_ss_selector;
+			u16 guest_ds_selector;
+			u16 guest_fs_selector;
+			u16 guest_gs_selector;
+			u16 guest_ldtr_selector;
+			u16 guest_tr_selector;
+
+			u32 guest_es_limit;
+			u32 guest_cs_limit;
+			u32 guest_ss_limit;
+			u32 guest_ds_limit;
+			u32 guest_fs_limit;
+			u32 guest_gs_limit;
+			u32 guest_ldtr_limit;
+			u32 guest_tr_limit;
+			u32 guest_gdtr_limit;
+			u32 guest_idtr_limit;
+
+			u32 guest_es_ar_bytes;
+			u32 guest_cs_ar_bytes;
+			u32 guest_ss_ar_bytes;
+			u32 guest_ds_ar_bytes;
+			u32 guest_fs_ar_bytes;
+			u32 guest_gs_ar_bytes;
+			u32 guest_ldtr_ar_bytes;
+			u32 guest_tr_ar_bytes;
+
+			natural_width guest_es_base;
+			natural_width guest_cs_base;
+			natural_width guest_ss_base;
+			natural_width guest_ds_base;
+			natural_width guest_fs_base;
+			natural_width guest_gs_base;
+			natural_width guest_ldtr_base;
+			natural_width guest_tr_base;
+			natural_width guest_gdtr_base;
+			natural_width guest_idtr_base;
+
+			u64 padding64_1[3];
+
+			u64 vm_exit_msr_store_addr;
+			u64 vm_exit_msr_load_addr;
+			u64 vm_entry_msr_load_addr;
+
+			natural_width cr3_target_value0;
+			natural_width cr3_target_value1;
+			natural_width cr3_target_value2;
+			natural_width cr3_target_value3;
+
+			u32 page_fault_error_code_mask;
+			u32 page_fault_error_code_match;
+
+			u32 cr3_target_count;
+			u32 vm_exit_msr_store_count;
+			u32 vm_exit_msr_load_count;
+			u32 vm_entry_msr_load_count;
+
+			u64 tsc_offset;
+			u64 virtual_apic_page_addr;
+			u64 vmcs_link_pointer;
+
+			u64 guest_ia32_debugctl;
+			u64 guest_ia32_pat;
+			u64 guest_ia32_efer;
+
+			u64 guest_pdptr0;
+			u64 guest_pdptr1;
+			u64 guest_pdptr2;
+			u64 guest_pdptr3;
+
+			natural_width guest_pending_dbg_exceptions;
+			natural_width guest_sysenter_esp;
+			natural_width guest_sysenter_eip;
+
+			u32 guest_activity_state;
+			u32 guest_sysenter_cs;
+
+			natural_width cr0_guest_host_mask;
+			natural_width cr4_guest_host_mask;
+			natural_width cr0_read_shadow;
+			natural_width cr4_read_shadow;
+			natural_width guest_cr0;
+			natural_width guest_cr3;
+			natural_width guest_cr4;
+			natural_width guest_dr7;
+
+			natural_width host_fs_base;
+			natural_width host_gs_base;
+			natural_width host_tr_base;
+			natural_width host_gdtr_base;
+			natural_width host_idtr_base;
+			natural_width host_rsp;
+
+			u64 ept_pointer;
+
+			u16 virtual_processor_id;
+			u16 padding16[3];
+
+			u64 padding64_2[5];
+			u64 guest_physical_address;
+
+			u32 vm_instruction_error;
+			u32 vm_exit_reason;
+			u32 vm_exit_intr_info;
+			u32 vm_exit_intr_error_code;
+			u32 idt_vectoring_info_field;
+			u32 idt_vectoring_error_code;
+			u32 vm_exit_instruction_len;
+			u32 vmx_instruction_info;
+
+			natural_width exit_qualification;
+			natural_width padding64_3[4];
+
+			natural_width guest_linear_address;
+			natural_width guest_rsp;
+			natural_width guest_rflags;
+
+			u32 guest_interruptibility_info;
+			u32 cpu_based_vm_exec_control;
+			u32 exception_bitmap;
+			u32 vm_entry_controls;
+			u32 vm_entry_intr_info_field;
+			u32 vm_entry_exception_error_code;
+			u32 vm_entry_instruction_len;
+			u32 tpr_threshold;
+
+			natural_width guest_rip;
+
+			u32 hv_clean_fields;
+			u32 hv_padding_32;
+			u32 hv_synthetic_controls;
+			u32 hv_enlightenments_control;
+			u32 hv_vp_id;
+
+			u64 hv_vm_id;
+			u64 partition_assist_page;
+			u64 padding64_4[4];
+			u64 guest_bndcfgs;
+			u64 padding64_5[7];
+			u64 xss_exit_bitmap;
+			u64 padding64_6[7];
+		};
+	};
+
+	/* Synthetic and KVM-specific fields: */
 	u32 launch_state; /* set to 0 by VMCLEAR, to 1 by VMLAUNCH */
 	u32 padding[7]; /* room for future expansion */
 
-	u64 io_bitmap_a;
-	u64 io_bitmap_b;
-	u64 msr_bitmap;
-	u64 vm_exit_msr_store_addr;
-	u64 vm_exit_msr_load_addr;
-	u64 vm_entry_msr_load_addr;
-	u64 tsc_offset;
-	u64 virtual_apic_page_addr;
 	u64 apic_access_addr;
 	u64 posted_intr_desc_addr;
 	u64 vm_function_control;
-	u64 ept_pointer;
 	u64 eoi_exit_bitmap0;
 	u64 eoi_exit_bitmap1;
 	u64 eoi_exit_bitmap2;
 	u64 eoi_exit_bitmap3;
 	u64 eptp_list_address;
-	u64 xss_exit_bitmap;
-	u64 guest_physical_address;
-	u64 vmcs_link_pointer;
 	u64 pml_address;
-	u64 guest_ia32_debugctl;
-	u64 guest_ia32_pat;
-	u64 guest_ia32_efer;
 	u64 guest_ia32_perf_global_ctrl;
-	u64 guest_pdptr0;
-	u64 guest_pdptr1;
-	u64 guest_pdptr2;
-	u64 guest_pdptr3;
-	u64 guest_bndcfgs;
-	u64 host_ia32_pat;
-	u64 host_ia32_efer;
 	u64 host_ia32_perf_global_ctrl;
 	u64 padding64[8]; /* room for future expansion */
-	/*
-	 * To allow migration of L1 (complete with its L2 guests) between
-	 * machines of different natural widths (32 or 64 bit), we cannot have
-	 * unsigned long fields with no explict size. We use u64 (aliased
-	 * natural_width) instead. Luckily, x86 is little-endian.
-	 */
-	natural_width cr0_guest_host_mask;
-	natural_width cr4_guest_host_mask;
-	natural_width cr0_read_shadow;
-	natural_width cr4_read_shadow;
-	natural_width cr3_target_value0;
-	natural_width cr3_target_value1;
-	natural_width cr3_target_value2;
-	natural_width cr3_target_value3;
-	natural_width exit_qualification;
-	natural_width guest_linear_address;
-	natural_width guest_cr0;
-	natural_width guest_cr3;
-	natural_width guest_cr4;
-	natural_width guest_es_base;
-	natural_width guest_cs_base;
-	natural_width guest_ss_base;
-	natural_width guest_ds_base;
-	natural_width guest_fs_base;
-	natural_width guest_gs_base;
-	natural_width guest_ldtr_base;
-	natural_width guest_tr_base;
-	natural_width guest_gdtr_base;
-	natural_width guest_idtr_base;
-	natural_width guest_dr7;
-	natural_width guest_rsp;
-	natural_width guest_rip;
-	natural_width guest_rflags;
-	natural_width guest_pending_dbg_exceptions;
-	natural_width guest_sysenter_esp;
-	natural_width guest_sysenter_eip;
-	natural_width host_cr0;
-	natural_width host_cr3;
-	natural_width host_cr4;
-	natural_width host_fs_base;
-	natural_width host_gs_base;
-	natural_width host_tr_base;
-	natural_width host_gdtr_base;
-	natural_width host_idtr_base;
-	natural_width host_ia32_sysenter_esp;
-	natural_width host_ia32_sysenter_eip;
-	natural_width host_rsp;
-	natural_width host_rip;
-	natural_width paddingl[8]; /* room for future expansion */
-	u32 pin_based_vm_exec_control;
-	u32 cpu_based_vm_exec_control;
-	u32 exception_bitmap;
-	u32 page_fault_error_code_mask;
-	u32 page_fault_error_code_match;
-	u32 cr3_target_count;
-	u32 vm_exit_controls;
-	u32 vm_exit_msr_store_count;
-	u32 vm_exit_msr_load_count;
-	u32 vm_entry_controls;
-	u32 vm_entry_msr_load_count;
-	u32 vm_entry_intr_info_field;
-	u32 vm_entry_exception_error_code;
-	u32 vm_entry_instruction_len;
-	u32 tpr_threshold;
-	u32 secondary_vm_exec_control;
-	u32 vm_instruction_error;
-	u32 vm_exit_reason;
-	u32 vm_exit_intr_info;
-	u32 vm_exit_intr_error_code;
-	u32 idt_vectoring_info_field;
-	u32 idt_vectoring_error_code;
-	u32 vm_exit_instruction_len;
-	u32 vmx_instruction_info;
-	u32 guest_es_limit;
-	u32 guest_cs_limit;
-	u32 guest_ss_limit;
-	u32 guest_ds_limit;
-	u32 guest_fs_limit;
-	u32 guest_gs_limit;
-	u32 guest_ldtr_limit;
-	u32 guest_tr_limit;
-	u32 guest_gdtr_limit;
-	u32 guest_idtr_limit;
-	u32 guest_es_ar_bytes;
-	u32 guest_cs_ar_bytes;
-	u32 guest_ss_ar_bytes;
-	u32 guest_ds_ar_bytes;
-	u32 guest_fs_ar_bytes;
-	u32 guest_gs_ar_bytes;
-	u32 guest_ldtr_ar_bytes;
-	u32 guest_tr_ar_bytes;
-	u32 guest_interruptibility_info;
-	u32 guest_activity_state;
-	u32 guest_sysenter_cs;
-	u32 host_ia32_sysenter_cs;
 	u32 vmx_preemption_timer_value;
 	u32 padding32[7]; /* room for future expansion */
-	u16 virtual_processor_id;
 	u16 posted_intr_nv;
-	u16 guest_es_selector;
-	u16 guest_cs_selector;
-	u16 guest_ss_selector;
-	u16 guest_ds_selector;
-	u16 guest_fs_selector;
-	u16 guest_gs_selector;
-	u16 guest_ldtr_selector;
-	u16 guest_tr_selector;
 	u16 guest_intr_status;
 	u16 guest_pml_index;
-	u16 host_es_selector;
-	u16 host_cs_selector;
-	u16 host_ss_selector;
-	u16 host_ds_selector;
-	u16 host_fs_selector;
-	u16 host_gs_selector;
-	u16 host_tr_selector;
 };
 
 /*
@@ -399,7 +452,7 @@ struct __packed vmcs12 {
  * layout of struct vmcs12 is changed. MSR_IA32_VMX_BASIC returns this id, and
  * VMPTRLD verifies that the VMCS region that L1 is loading contains this id.
  */
-#define VMCS12_REVISION 0x11e57ed0
+#define VMCS12_REVISION 0x11e586b1
 
 /*
  * VMCS12_SIZE is the number of bytes L1 should allocate for the VMXON region
-- 
2.14.3