[PATCH 5/5] Nested VMX patch 5 implements vmlaunch and vmresume

[oritw@il.ibm.com]

From: Orit Wasserman <oritw@il.ibm.com>

---
 arch/x86/kvm/vmx.c | 1173 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 files changed, 1148 insertions(+), 25 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 6a4c252..e814029 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -209,6 +209,7 @@ struct __attribute__ ((__packed__)) level_state {
 	struct vmcs *vmcs;
 	int cpu;
 	int launched;
+	bool first_launch;
 };
 
 struct nested_vmx {
@@ -216,6 +217,12 @@ struct nested_vmx {
 	bool vmxon;
 	/* What is the location of the  vmcs l1 keeps for l2? (in level1 gpa) */
 	u64 vmptr;
+	/* Are we running nested guest */
+	bool nested_mode;
+	/* L1 requested VMLAUNCH or VMRESUME but we didn't run L2 yet */
+	bool nested_run_pending;
+	/* flag indicating if there was a valid IDT after exiting from l2 */
+	bool nested_valid_idt;
 	/*
 	 * Level 2 state : includes vmcs,registers and
 	 * a copy of vmcs12 for vmread/vmwrite
@@ -240,6 +247,10 @@ static inline int vmcs_field_length(unsigned long field)
 	return (VMCS_FIELD_LENGTH_MASK & field) >> 13;
 }
 
+#define NESTED_VM_EXIT_CONTROLS_MASK (~(VM_EXIT_LOAD_IA32_PAT | \
+					VM_EXIT_SAVE_IA32_PAT))
+#define NESTED_VM_ENTRY_CONTROLS_MASK (~(VM_ENTRY_LOAD_IA32_PAT | \
+					 VM_ENTRY_IA32E_MODE))
 struct vmcs {
 	u32 revision_id;
 	u32 abort;
@@ -303,6 +314,12 @@ static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
 	return container_of(vcpu, struct vcpu_vmx, vcpu);
 }
 
+static inline struct shadow_vmcs *get_shadow_vmcs(struct kvm_vcpu *vcpu)
+{
+	WARN_ON(!to_vmx(vcpu)->nested.l2_state->shadow_vmcs);
+	return to_vmx(vcpu)->nested.l2_state->shadow_vmcs;
+}
+
 #define SHADOW_VMCS_OFFSET(x) offsetof(struct shadow_vmcs, x)
 
 static unsigned short vmcs_field_to_offset_table[HOST_RIP+1] = {
@@ -822,8 +839,16 @@ static struct kvm_vmx_segment_field {
 static void ept_save_pdptrs(struct kvm_vcpu *vcpu);
 
 static int nested_vmx_check_permission(struct kvm_vcpu *vcpu);
+static int nested_vmx_check_exception(struct vcpu_vmx *vmx, unsigned nr,
+				      bool has_error_code, u32 error_code);
+static int nested_vmx_intr(struct kvm_vcpu *vcpu);
 static int create_l1_state(struct kvm_vcpu *vcpu);
 static int create_l2_state(struct kvm_vcpu *vcpu);
+static int launch_guest(struct kvm_vcpu *vcpu);
+static int nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu);
+static int nested_vmx_exit_handled(struct kvm_vcpu *vcpu, bool kvm_override);
+static int nested_vmx_vmexit(struct kvm_vcpu *vcpu,
+			     bool is_interrupt);
 
 /*
  * Keep MSR_K6_STAR at the end, as setup_msrs() will try to optimize it
@@ -940,6 +965,18 @@ static inline bool cpu_has_vmx_ept_2m_page(void)
 	return !!(vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT);
 }
 
+static inline int is_exception(u32 intr_info)
+{
+	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
+		== (INTR_TYPE_HARD_EXCEPTION | INTR_INFO_VALID_MASK);
+}
+
+static inline int is_nmi(u32 intr_info)
+{
+	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
+		== (INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK);
+}
+
 static inline int cpu_has_vmx_invept_individual_addr(void)
 {
 	return !!(vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT);
@@ -990,6 +1027,51 @@ static inline bool report_flexpriority(void)
 	return flexpriority_enabled;
 }
 
+static inline int nested_cpu_has_vmx_tpr_shadow(struct  kvm_vcpu *vcpu)
+{
+	return cpu_has_vmx_tpr_shadow() &&
+		get_shadow_vmcs(vcpu)->cpu_based_vm_exec_control &
+		CPU_BASED_TPR_SHADOW;
+}
+
+static inline int nested_cpu_has_secondary_exec_ctrls(struct kvm_vcpu *vcpu)
+{
+	return cpu_has_secondary_exec_ctrls() &&
+		get_shadow_vmcs(vcpu)->cpu_based_vm_exec_control &
+		CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
+}
+
+static inline bool nested_vm_need_virtualize_apic_accesses(struct kvm_vcpu
+							   *vcpu)
+{
+	return get_shadow_vmcs(vcpu)->secondary_vm_exec_control &
+		SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
+}
+
+static inline int nested_cpu_has_vmx_ept(struct kvm_vcpu *vcpu)
+{
+	return get_shadow_vmcs(vcpu)->
+		secondary_vm_exec_control & SECONDARY_EXEC_ENABLE_EPT;
+}
+
+static inline int nested_cpu_has_vmx_vpid(struct kvm_vcpu *vcpu)
+{
+	return get_shadow_vmcs(vcpu)->secondary_vm_exec_control &
+		SECONDARY_EXEC_ENABLE_VPID;
+}
+
+static inline int nested_cpu_has_vmx_pat(struct kvm_vcpu *vcpu)
+{
+	return get_shadow_vmcs(vcpu)->vm_entry_controls &
+		VM_ENTRY_LOAD_IA32_PAT;
+}
+
+static inline int nested_cpu_has_vmx_msr_bitmap(struct kvm_vcpu *vcpu)
+{
+	return get_shadow_vmcs(vcpu)->cpu_based_vm_exec_control &
+		CPU_BASED_USE_MSR_BITMAPS;
+}
+
 static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
 {
 	int i;
@@ -1501,6 +1583,9 @@ static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
 	u32 intr_info = nr | INTR_INFO_VALID_MASK;
 
+	if (nested_vmx_check_exception(vmx, nr, has_error_code, error_code))
+		return;
+
 	if (has_error_code) {
 		vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
 		intr_info |= INTR_INFO_DELIVER_CODE_MASK;
@@ -1943,6 +2028,200 @@ static void vmclear_local_vcpus(void)
 		__vcpu_clear(vmx);
 }
 
+void prepare_vmcs_12(struct kvm_vcpu *vcpu)
+{
+	struct shadow_vmcs *l2_shadow_vmcs =
+		get_shadow_vmcs(vcpu);
+
+	l2_shadow_vmcs->guest_es_selector = vmcs_read16(GUEST_ES_SELECTOR);
+	l2_shadow_vmcs->guest_cs_selector = vmcs_read16(GUEST_CS_SELECTOR);
+	l2_shadow_vmcs->guest_ss_selector = vmcs_read16(GUEST_SS_SELECTOR);
+	l2_shadow_vmcs->guest_ds_selector = vmcs_read16(GUEST_DS_SELECTOR);
+	l2_shadow_vmcs->guest_fs_selector = vmcs_read16(GUEST_FS_SELECTOR);
+	l2_shadow_vmcs->guest_gs_selector = vmcs_read16(GUEST_GS_SELECTOR);
+	l2_shadow_vmcs->guest_ldtr_selector = vmcs_read16(GUEST_LDTR_SELECTOR);
+	l2_shadow_vmcs->guest_tr_selector = vmcs_read16(GUEST_TR_SELECTOR);
+
+	l2_shadow_vmcs->tsc_offset = vmcs_read64(TSC_OFFSET);
+	l2_shadow_vmcs->guest_physical_address =
+		vmcs_read64(GUEST_PHYSICAL_ADDRESS);
+	l2_shadow_vmcs->vmcs_link_pointer = vmcs_read64(VMCS_LINK_POINTER);
+	l2_shadow_vmcs->guest_ia32_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
+	if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT)
+		l2_shadow_vmcs->guest_ia32_pat = vmcs_read64(GUEST_IA32_PAT);
+	l2_shadow_vmcs->cr3_target_count = vmcs_read32(CR3_TARGET_COUNT);
+	l2_shadow_vmcs->vm_entry_intr_info_field =
+		vmcs_read32(VM_ENTRY_INTR_INFO_FIELD);
+	l2_shadow_vmcs->vm_entry_exception_error_code =
+		vmcs_read32(VM_ENTRY_EXCEPTION_ERROR_CODE);
+	l2_shadow_vmcs->vm_entry_instruction_len =
+		vmcs_read32(VM_ENTRY_INSTRUCTION_LEN);
+	l2_shadow_vmcs->vm_instruction_error =
+		vmcs_read32(VM_INSTRUCTION_ERROR);
+	l2_shadow_vmcs->vm_exit_reason  = vmcs_read32(VM_EXIT_REASON);
+	l2_shadow_vmcs->vm_exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
+	l2_shadow_vmcs->vm_exit_intr_error_code =
+		vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
+	l2_shadow_vmcs->idt_vectoring_info_field =
+		vmcs_read32(IDT_VECTORING_INFO_FIELD);
+	l2_shadow_vmcs->idt_vectoring_error_code =
+		vmcs_read32(IDT_VECTORING_ERROR_CODE);
+	l2_shadow_vmcs->vm_exit_instruction_len =
+		vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
+	l2_shadow_vmcs->vmx_instruction_info =
+		vmcs_read32(VMX_INSTRUCTION_INFO);
+	l2_shadow_vmcs->guest_es_limit = vmcs_read32(GUEST_ES_LIMIT);
+	l2_shadow_vmcs->guest_cs_limit = vmcs_read32(GUEST_CS_LIMIT);
+	l2_shadow_vmcs->guest_ss_limit = vmcs_read32(GUEST_SS_LIMIT);
+	l2_shadow_vmcs->guest_ds_limit = vmcs_read32(GUEST_DS_LIMIT);
+	l2_shadow_vmcs->guest_fs_limit = vmcs_read32(GUEST_FS_LIMIT);
+	l2_shadow_vmcs->guest_gs_limit = vmcs_read32(GUEST_GS_LIMIT);
+	l2_shadow_vmcs->guest_ldtr_limit = vmcs_read32(GUEST_LDTR_LIMIT);
+	l2_shadow_vmcs->guest_tr_limit = vmcs_read32(GUEST_TR_LIMIT);
+	l2_shadow_vmcs->guest_gdtr_limit = vmcs_read32(GUEST_GDTR_LIMIT);
+	l2_shadow_vmcs->guest_idtr_limit = vmcs_read32(GUEST_IDTR_LIMIT);
+	l2_shadow_vmcs->guest_es_ar_bytes = vmcs_read32(GUEST_ES_AR_BYTES);
+	l2_shadow_vmcs->guest_cs_ar_bytes = vmcs_read32(GUEST_CS_AR_BYTES);
+	l2_shadow_vmcs->guest_ss_ar_bytes = vmcs_read32(GUEST_SS_AR_BYTES);
+	l2_shadow_vmcs->guest_ds_ar_bytes = vmcs_read32(GUEST_DS_AR_BYTES);
+	l2_shadow_vmcs->guest_fs_ar_bytes = vmcs_read32(GUEST_FS_AR_BYTES);
+	l2_shadow_vmcs->guest_gs_ar_bytes = vmcs_read32(GUEST_GS_AR_BYTES);
+	l2_shadow_vmcs->guest_ldtr_ar_bytes = vmcs_read32(GUEST_LDTR_AR_BYTES);
+	l2_shadow_vmcs->guest_tr_ar_bytes = vmcs_read32(GUEST_TR_AR_BYTES);
+	l2_shadow_vmcs->guest_interruptibility_info =
+		vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
+	l2_shadow_vmcs->guest_activity_state =
+		vmcs_read32(GUEST_ACTIVITY_STATE);
+	l2_shadow_vmcs->guest_sysenter_cs = vmcs_read32(GUEST_SYSENTER_CS);
+
+	l2_shadow_vmcs->cr0_read_shadow = vmcs_readl(CR0_READ_SHADOW);
+	l2_shadow_vmcs->cr4_read_shadow = vmcs_readl(CR4_READ_SHADOW);
+	l2_shadow_vmcs->exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
+	l2_shadow_vmcs->guest_linear_address = vmcs_readl(GUEST_LINEAR_ADDRESS);
+	l2_shadow_vmcs->guest_cr0 = vmcs_readl(GUEST_CR0);
+
+	l2_shadow_vmcs->guest_cr4 = vmcs_readl(GUEST_CR4);
+	l2_shadow_vmcs->guest_es_base = vmcs_readl(GUEST_ES_BASE);
+	l2_shadow_vmcs->guest_cs_base = vmcs_readl(GUEST_CS_BASE);
+	l2_shadow_vmcs->guest_ss_base = vmcs_readl(GUEST_SS_BASE);
+	l2_shadow_vmcs->guest_ds_base = vmcs_readl(GUEST_DS_BASE);
+	l2_shadow_vmcs->guest_fs_base = vmcs_readl(GUEST_FS_BASE);
+	l2_shadow_vmcs->guest_gs_base = vmcs_readl(GUEST_GS_BASE);
+	l2_shadow_vmcs->guest_ldtr_base = vmcs_readl(GUEST_LDTR_BASE);
+	l2_shadow_vmcs->guest_tr_base = vmcs_readl(GUEST_TR_BASE);
+	l2_shadow_vmcs->guest_gdtr_base = vmcs_readl(GUEST_GDTR_BASE);
+	l2_shadow_vmcs->guest_idtr_base = vmcs_readl(GUEST_IDTR_BASE);
+	l2_shadow_vmcs->guest_dr7 = vmcs_readl(GUEST_DR7);
+	l2_shadow_vmcs->guest_rsp = vmcs_readl(GUEST_RSP);
+	l2_shadow_vmcs->guest_rip = vmcs_readl(GUEST_RIP);
+	l2_shadow_vmcs->guest_rflags = vmcs_readl(GUEST_RFLAGS);
+	l2_shadow_vmcs->guest_pending_dbg_exceptions =
+		vmcs_readl(GUEST_PENDING_DBG_EXCEPTIONS);
+	l2_shadow_vmcs->guest_sysenter_esp = vmcs_readl(GUEST_SYSENTER_ESP);
+	l2_shadow_vmcs->guest_sysenter_eip = vmcs_readl(GUEST_SYSENTER_EIP);
+}
+
+int load_vmcs_common(struct shadow_vmcs *src)
+{
+	vmcs_write16(GUEST_ES_SELECTOR, src->guest_es_selector);
+	vmcs_write16(GUEST_CS_SELECTOR, src->guest_cs_selector);
+	vmcs_write16(GUEST_SS_SELECTOR, src->guest_ss_selector);
+	vmcs_write16(GUEST_DS_SELECTOR, src->guest_ds_selector);
+	vmcs_write16(GUEST_FS_SELECTOR, src->guest_fs_selector);
+	vmcs_write16(GUEST_GS_SELECTOR, src->guest_gs_selector);
+	vmcs_write16(GUEST_LDTR_SELECTOR, src->guest_ldtr_selector);
+	vmcs_write16(GUEST_TR_SELECTOR, src->guest_tr_selector);
+
+	vmcs_write64(VMCS_LINK_POINTER, src->vmcs_link_pointer);
+	vmcs_write64(GUEST_IA32_DEBUGCTL, src->guest_ia32_debugctl);
+
+	if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT)
+		vmcs_write64(GUEST_IA32_PAT, src->guest_ia32_pat);
+
+	vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, src->vm_entry_msr_load_count);
+	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, src->vm_entry_intr_info_field);
+	vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
+		     src->vm_entry_exception_error_code);
+	vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, src->vm_entry_instruction_len);
+
+	vmcs_write32(GUEST_ES_LIMIT, src->guest_es_limit);
+	vmcs_write32(GUEST_CS_LIMIT, src->guest_cs_limit);
+	vmcs_write32(GUEST_SS_LIMIT, src->guest_ss_limit);
+	vmcs_write32(GUEST_DS_LIMIT, src->guest_ds_limit);
+	vmcs_write32(GUEST_FS_LIMIT, src->guest_fs_limit);
+	vmcs_write32(GUEST_GS_LIMIT, src->guest_gs_limit);
+	vmcs_write32(GUEST_LDTR_LIMIT, src->guest_ldtr_limit);
+	vmcs_write32(GUEST_TR_LIMIT, src->guest_tr_limit);
+	vmcs_write32(GUEST_GDTR_LIMIT, src->guest_gdtr_limit);
+	vmcs_write32(GUEST_IDTR_LIMIT, src->guest_idtr_limit);
+	vmcs_write32(GUEST_ES_AR_BYTES, src->guest_es_ar_bytes);
+	vmcs_write32(GUEST_CS_AR_BYTES, src->guest_cs_ar_bytes);
+	vmcs_write32(GUEST_SS_AR_BYTES, src->guest_ss_ar_bytes);
+	vmcs_write32(GUEST_DS_AR_BYTES, src->guest_ds_ar_bytes);
+	vmcs_write32(GUEST_FS_AR_BYTES, src->guest_fs_ar_bytes);
+	vmcs_write32(GUEST_GS_AR_BYTES, src->guest_gs_ar_bytes);
+	vmcs_write32(GUEST_LDTR_AR_BYTES, src->guest_ldtr_ar_bytes);
+	vmcs_write32(GUEST_TR_AR_BYTES, src->guest_tr_ar_bytes);
+	vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
+		     src->guest_interruptibility_info);
+	vmcs_write32(GUEST_ACTIVITY_STATE, src->guest_activity_state);
+	vmcs_write32(GUEST_SYSENTER_CS, src->guest_sysenter_cs);
+
+	vmcs_writel(GUEST_ES_BASE, src->guest_es_base);
+	vmcs_writel(GUEST_CS_BASE, src->guest_cs_base);
+	vmcs_writel(GUEST_SS_BASE, src->guest_ss_base);
+	vmcs_writel(GUEST_DS_BASE, src->guest_ds_base);
+	vmcs_writel(GUEST_FS_BASE, src->guest_fs_base);
+	vmcs_writel(GUEST_GS_BASE, src->guest_gs_base);
+	vmcs_writel(GUEST_LDTR_BASE, src->guest_ldtr_base);
+	vmcs_writel(GUEST_TR_BASE, src->guest_tr_base);
+	vmcs_writel(GUEST_GDTR_BASE, src->guest_gdtr_base);
+	vmcs_writel(GUEST_IDTR_BASE, src->guest_idtr_base);
+	vmcs_writel(GUEST_DR7, src->guest_dr7);
+	vmcs_writel(GUEST_RSP, src->guest_rsp);
+	vmcs_writel(GUEST_RIP, src->guest_rip);
+	vmcs_writel(GUEST_RFLAGS, src->guest_rflags);
+	vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS,
+		    src->guest_pending_dbg_exceptions);
+	vmcs_writel(GUEST_SYSENTER_ESP, src->guest_sysenter_esp);
+	vmcs_writel(GUEST_SYSENTER_EIP, src->guest_sysenter_eip);
+
+	return 0;
+}
+
+int load_vmcs_host_state(struct shadow_vmcs *src)
+{
+	vmcs_write16(HOST_ES_SELECTOR, src->host_es_selector);
+	vmcs_write16(HOST_CS_SELECTOR, src->host_cs_selector);
+	vmcs_write16(HOST_SS_SELECTOR, src->host_ss_selector);
+	vmcs_write16(HOST_DS_SELECTOR, src->host_ds_selector);
+	vmcs_write16(HOST_FS_SELECTOR, src->host_fs_selector);
+	vmcs_write16(HOST_GS_SELECTOR, src->host_gs_selector);
+	vmcs_write16(HOST_TR_SELECTOR, src->host_tr_selector);
+
+	vmcs_write64(TSC_OFFSET, src->tsc_offset);
+
+	if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT)
+		vmcs_write64(HOST_IA32_PAT, src->host_ia32_pat);
+
+	vmcs_write32(HOST_IA32_SYSENTER_CS, src->host_ia32_sysenter_cs);
+
+	vmcs_writel(HOST_CR0, src->host_cr0);
+	vmcs_writel(HOST_CR3, src->host_cr3);
+	vmcs_writel(HOST_CR4, src->host_cr4);
+	vmcs_writel(HOST_FS_BASE, src->host_fs_base);
+	vmcs_writel(HOST_GS_BASE, src->host_gs_base);
+	vmcs_writel(HOST_TR_BASE, src->host_tr_base);
+	vmcs_writel(HOST_GDTR_BASE, src->host_gdtr_base);
+	vmcs_writel(HOST_IDTR_BASE, src->host_idtr_base);
+	vmcs_writel(HOST_RSP, src->host_rsp);
+	vmcs_writel(HOST_RIP, src->host_rip);
+	vmcs_writel(HOST_IA32_SYSENTER_ESP, src->host_ia32_sysenter_esp);
+	vmcs_writel(HOST_IA32_SYSENTER_EIP, src->host_ia32_sysenter_eip);
+
+	return 0;
+}
+
 struct level_state *create_state(void)
 {
 	struct level_state *state = NULL;
@@ -2003,6 +2282,8 @@ int create_l2_state(struct kvm_vcpu *vcpu)
 	vmx->nested.l2_state->io_bitmap_a = vmcs_read64(IO_BITMAP_A);
 	vmx->nested.l2_state->io_bitmap_b = vmcs_read64(IO_BITMAP_B);
 
+	vmx->nested.l2_state->first_launch = true;
+
 	return 0;
 }
 
@@ -3393,6 +3674,14 @@ static void enable_irq_window(struct kvm_vcpu *vcpu)
 {
 	u32 cpu_based_vm_exec_control;
 
+	if (to_vmx(vcpu)->nested.nested_mode) {
+		if (kvm_cpu_has_interrupt(vcpu)) {
+			if (nested_vmx_intr(vcpu))
+				return;
+		}
+		return;
+	}
+
 	cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
 	cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
 	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
@@ -3448,6 +3737,10 @@ static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
 
+	if (vmx->nested.nested_mode) {
+		return;
+	}
+
 	if (!cpu_has_virtual_nmis()) {
 		/*
 		 * Tracking the NMI-blocked state in software is built upon
@@ -3489,6 +3782,13 @@ static int vmx_nmi_allowed(struct kvm_vcpu *vcpu)
 
 static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
 {
+	if (to_vmx(vcpu)->nested.nested_mode) {
+		if (kvm_cpu_has_interrupt(vcpu)) {
+			if (!nested_vmx_intr(vcpu))
+				return 0;
+		}
+	}
+
 	return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
 		!(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
 			(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
@@ -3993,12 +4293,6 @@ static int nested_vmx_check_permission(struct kvm_vcpu *vcpu)
 	return 1;
 }
 
-static int handle_vmx_insn(struct kvm_vcpu *vcpu)
-{
-	kvm_queue_exception(vcpu, UD_VECTOR);
-	return 1;
-}
-
 static void clear_rflags_cf_zf(struct kvm_vcpu *vcpu)
 {
 	unsigned long rflags;
@@ -4040,6 +4334,27 @@ static int handle_vmclear(struct kvm_vcpu *vcpu)
 	return 1;
 }
 
+static int handle_vmlaunch(struct kvm_vcpu *vcpu)
+{
+	if (!nested_vmx_check_permission(vcpu))
+		return 1;
+	if (!to_vmx(vcpu)->nested.l2_state->vmclear)
+		return 1;
+
+	return launch_guest(vcpu);
+}
+
+static int handle_vmresume(struct kvm_vcpu *vcpu)
+{
+	if (!nested_vmx_check_permission(vcpu))
+		return 1;
+
+	if (to_vmx(vcpu)->nested.l2_state->vmclear)
+		return 1;
+
+	return launch_guest(vcpu);
+}
+
 static int handle_vmread(struct kvm_vcpu *vcpu)
 {
 #ifndef CONFIG_X86_64
@@ -4050,7 +4365,6 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
 		return 1;
 
 	if (!nested_map_shadow_vmcs(vcpu)) {
-		printk(KERN_INFO "%s invalid shadow vmcs\n", __func__);
 		set_rflags_to_vmx_fail_invalid(vcpu);
 		return 1;
 	}
@@ -4107,7 +4421,6 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
 		return 1;
 
 	if (!nested_map_shadow_vmcs(vcpu)) {
-		printk(KERN_INFO "%s invalid shadow vmcs\n", __func__);
 		set_rflags_to_vmx_fail_invalid(vcpu);
 		return 1;
 	}
@@ -4137,16 +4450,16 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
 				   vcpu->arch.regs[VCPU_REGS_RAX]);
 		break;
 	default:
+		nested_unmap_shadow_vmcs(vcpu);
 		printk(KERN_INFO "%s invalid field\n", __func__);
 		set_rflags_to_vmx_fail_valid(vcpu);
 		vmcs_write32(VM_INSTRUCTION_ERROR, 12);
-		nested_unmap_shadow_vmcs(vcpu);
 		return 1;
 	}
 
+	nested_unmap_shadow_vmcs(vcpu);
 	clear_rflags_cf_zf(vcpu);
 	skip_emulated_instruction(vcpu);
-	nested_unmap_shadow_vmcs(vcpu);
 	return 1;
 }
 
@@ -4208,7 +4521,6 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
 static int handle_vmptrld(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
-	struct page *vmcs_page;
 	u64 guest_vmcs_addr;
 
 	if (!nested_vmx_check_permission(vcpu))
@@ -4228,14 +4540,7 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
 	}
 
 	if (vmx->nested.vmptr != guest_vmcs_addr) {
-		/* checking vmptr address */
-		vmcs_page = nested_get_page(vcpu, guest_vmcs_addr);
-		if (vmcs_page == NULL)
-			return 1;
-
 		vmx->nested.vmptr = guest_vmcs_addr;
-
-		kvm_release_page_clean(vmcs_page);
 	}
 
 	clear_rflags_cf_zf(vcpu);
@@ -4534,11 +4839,11 @@ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
 	[EXIT_REASON_INVLPG]		      = handle_invlpg,
 	[EXIT_REASON_VMCALL]                  = handle_vmcall,
 	[EXIT_REASON_VMCLEAR]	              = handle_vmclear,
-	[EXIT_REASON_VMLAUNCH]                = handle_vmx_insn,
+	[EXIT_REASON_VMLAUNCH]                = handle_vmlaunch,
 	[EXIT_REASON_VMPTRLD]                 = handle_vmptrld,
 	[EXIT_REASON_VMPTRST]                 = handle_vmptrst,
 	[EXIT_REASON_VMREAD]                  = handle_vmread,
-	[EXIT_REASON_VMRESUME]                = handle_vmx_insn,
+	[EXIT_REASON_VMRESUME]                = handle_vmresume,
 	[EXIT_REASON_VMWRITE]                 = handle_vmwrite,
 	[EXIT_REASON_VMOFF]                   = handle_vmoff,
 	[EXIT_REASON_VMON]                    = handle_vmon,
@@ -4566,6 +4871,17 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu)
 
 	trace_kvm_exit(exit_reason, kvm_rip_read(vcpu));
 
+	if (exit_reason == EXIT_REASON_VMLAUNCH ||
+	    exit_reason == EXIT_REASON_VMRESUME)
+		vmx->nested.nested_run_pending = 1;
+	else
+		vmx->nested.nested_run_pending = 0;
+
+	if (vmx->nested.nested_mode && nested_vmx_exit_handled(vcpu, true)) {
+		nested_vmx_vmexit(vcpu, false);
+		return 1;
+	}
+
 	/* If we need to emulate an MMIO from handle_invalid_guest_state
 	 * we just return 0 */
 	if (vmx->emulation_required && emulate_invalid_guest_state) {
@@ -4585,7 +4901,6 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu)
 			= vmcs_read32(VM_INSTRUCTION_ERROR);
 		return 0;
 	}
-
 	if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
 			(exit_reason != EXIT_REASON_EXCEPTION_NMI &&
 			exit_reason != EXIT_REASON_EPT_VIOLATION &&
@@ -4593,8 +4908,7 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu)
 		printk(KERN_WARNING "%s: unexpected, valid vectoring info "
 		       "(0x%x) and exit reason is 0x%x\n",
 		       __func__, vectoring_info, exit_reason);
-
-	if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) {
+	if (!vmx->nested.nested_mode && unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) {
 		if (vmx_interrupt_allowed(vcpu)) {
 			vmx->soft_vnmi_blocked = 0;
 		} else if (vmx->vnmi_blocked_time > 1000000000LL &&
@@ -4641,10 +4955,13 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
 	int type;
 	bool idtv_info_valid;
 
-	exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
-
 	vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
 
+	if (vmx->nested.nested_mode)
+		return;
+
+	exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
+
 	/* Handle machine checks before interrupts are enabled */
 	if ((vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY)
 	    || (vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI
@@ -4747,6 +5064,60 @@ static void fixup_rmode_irq(struct vcpu_vmx *vmx)
 		| vmx->rmode.irq.vector;
 }
 
+static int nested_handle_valid_idt(struct kvm_vcpu *vcpu)
+{
+	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	int irq;
+	int type;
+	int errCodeValid;
+	u32 idt_vectoring_info;
+	u32 guest_intr;
+	bool nmi_window_open;
+	bool interrupt_window_open;
+
+	if (vmx->nested.nested_mode && vmx->nested.nested_valid_idt) {
+		idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
+		irq  = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
+		type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
+		errCodeValid = idt_vectoring_info &
+			VECTORING_INFO_DELIVER_CODE_MASK;
+
+		guest_intr = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
+		nmi_window_open =
+			!(guest_intr & (GUEST_INTR_STATE_STI |
+					GUEST_INTR_STATE_MOV_SS |
+					GUEST_INTR_STATE_NMI));
+
+		interrupt_window_open =
+			((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
+			 !(guest_intr & (GUEST_INTR_STATE_STI |
+					 GUEST_INTR_STATE_MOV_SS)));
+
+		if (type == INTR_TYPE_EXT_INTR && !interrupt_window_open) {
+			printk(KERN_INFO "IDT ignored, l2 interrupt window closed!\n");
+			return 0;
+		}
+
+		if (type == INTR_TYPE_NMI_INTR && !nmi_window_open) {
+			printk(KERN_INFO "IDT ignored, l2 nmi window closed!\n");
+			return 0;
+		}
+
+		vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
+			irq | type | INTR_INFO_VALID_MASK | errCodeValid);
+
+
+		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
+			     vmcs_read32(VM_EXIT_INSTRUCTION_LEN));
+
+		if (errCodeValid)
+			vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
+				     vmcs_read32(IDT_VECTORING_ERROR_CODE));
+	}
+
+	return 1;
+}
+
 #ifdef CONFIG_X86_64
 #define R "r"
 #define Q "q"
@@ -4758,6 +5129,26 @@ static void fixup_rmode_irq(struct vcpu_vmx *vmx)
 static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	int r;
+
+	if (vmx->nested.nested_mode) {
+		r = nested_handle_valid_idt(vcpu);
+		if (!r) {
+			vmx->fail = 1;
+			return;
+		}
+
+		if (!nested_map_shadow_vmcs(vcpu)) {
+			vmx->fail = 1;
+			return;
+		}
+
+		vmcs_write32(EXCEPTION_BITMAP, get_shadow_vmcs(vcpu)->
+			     exception_bitmap |
+			     vmx->nested.l1_state->shadow_vmcs->exception_bitmap);
+
+		nested_unmap_shadow_vmcs(vcpu);
+	}
 
 	if (enable_ept && is_paging(vcpu)) {
 		vmcs_writel(GUEST_CR3, vcpu->arch.cr3);
@@ -4896,6 +5287,10 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
 	get_debugreg(vcpu->arch.dr6, 6);
 
 	vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
+
+	vmx->nested.nested_valid_idt = vmx->nested.nested_mode &&
+		(vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK);
+
 	if (vmx->rmode.irq.pending)
 		fixup_rmode_irq(vmx);
 
@@ -4984,6 +5379,11 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 			goto free_vmcs;
 	}
 
+	vmx->nested.vmptr = 0;
+
+	vmx->nested.l1_state = NULL;
+	vmx->nested.l2_state = NULL;
+
 	return &vmx->vcpu;
 
 free_vmcs:
@@ -5215,6 +5615,729 @@ void save_vmcs(struct shadow_vmcs *dst)
 	if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT)
 		dst->host_ia32_pat = vmcs_read64(HOST_IA32_PAT);
 }
+int prepare_vmcs_02(struct kvm_vcpu *vcpu)
+{
+	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	struct shadow_vmcs *src = get_shadow_vmcs(vcpu);
+	u32 exec_control;
+
+	if (!src) {
+		printk(KERN_INFO "%s: Error no shadow vmcs\n", __func__);
+		return 1;
+	}
+
+	load_vmcs_common(src);
+
+	if (vmx->nested.l2_state->first_launch) {
+		if (cpu_has_vmx_vpid() && vmx->nested.l2_state->vpid != 0)
+			vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->nested.l2_state->vpid);
+
+		if (vmx->nested.l2_state->io_bitmap_a)
+			vmcs_write64(IO_BITMAP_A, vmx->nested.l2_state->io_bitmap_a);
+
+		if (vmx->nested.l2_state->io_bitmap_b)
+			vmcs_write64(IO_BITMAP_B, vmx->nested.l2_state->io_bitmap_b);
+
+		if (vmx->nested.l2_state->msr_bitmap)
+			vmcs_write64(MSR_BITMAP, vmx->nested.l2_state->msr_bitmap);
+
+		if (src->vm_entry_msr_load_count > 0) {
+			struct page *page;
+
+			page = nested_get_page(vcpu,
+					       src->vm_entry_msr_load_addr);
+			if (!page)
+				return 1;
+
+			vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, page_to_phys(page));
+
+			kvm_release_page_clean(page);
+		}
+
+		if (nested_cpu_has_vmx_tpr_shadow(vcpu)) {
+			struct page *page;
+
+			page = nested_get_page(vcpu,
+					       src->virtual_apic_page_addr);
+			if (!page)
+				return 1;
+
+			vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, page_to_phys(page));
+
+			kvm_release_page_clean(page);
+		}
+
+		if (nested_vm_need_virtualize_apic_accesses(vcpu)) {
+			struct page *page =
+				nested_get_page(vcpu, src->apic_access_addr);
+			if (!page)
+				return 1;
+
+			vmcs_write64(APIC_ACCESS_ADDR, page_to_phys(page));
+			kvm_release_page_clean(page);
+		}
+
+		vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
+			     (vmx->nested.l1_state->shadow_vmcs->pin_based_vm_exec_control |
+			      src->pin_based_vm_exec_control));
+
+		vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK,
+			     (vmx->nested.l1_state->shadow_vmcs->page_fault_error_code_mask &
+			      src->page_fault_error_code_mask));
+
+		vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH,
+			     (vmx->nested.l1_state->shadow_vmcs->page_fault_error_code_match &
+			      src->page_fault_error_code_match));
+
+		if (cpu_has_secondary_exec_ctrls()) {
+
+			exec_control =
+				vmx->nested.l1_state->shadow_vmcs->secondary_vm_exec_control;
+
+			if (nested_cpu_has_secondary_exec_ctrls(vcpu)) {
+
+				exec_control |= src->secondary_vm_exec_control;
+
+				if (!vm_need_virtualize_apic_accesses(vcpu->kvm) ||
+				    !nested_vm_need_virtualize_apic_accesses(vcpu))
+					exec_control &=
+						~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
+			}
+
+			vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
+		}
+
+		load_vmcs_host_state(vmx->nested.l1_state->shadow_vmcs);
+
+		vmx->nested.l2_state->first_launch = false;
+	}
+
+	if (vm_need_tpr_shadow(vcpu->kvm) &&
+	    nested_cpu_has_vmx_tpr_shadow(vcpu))
+		vmcs_write32(TPR_THRESHOLD, src->tpr_threshold);
+
+	if (enable_ept) {
+		if (!nested_cpu_has_vmx_ept(vcpu)) {
+			vmcs_write64(EPT_POINTER,
+				     vmx->nested.l1_state->shadow_vmcs->ept_pointer);
+			vmcs_write64(GUEST_PDPTR0,
+				     vmx->nested.l1_state->shadow_vmcs->guest_pdptr0);
+			vmcs_write64(GUEST_PDPTR1,
+				     vmx->nested.l1_state->shadow_vmcs->guest_pdptr1);
+			vmcs_write64(GUEST_PDPTR2,
+				     vmx->nested.l1_state->shadow_vmcs->guest_pdptr2);
+			vmcs_write64(GUEST_PDPTR3,
+				     vmx->nested.l1_state->shadow_vmcs->guest_pdptr3);
+		}
+	}
+
+	exec_control = vmx->nested.l1_state->shadow_vmcs->cpu_based_vm_exec_control;
+
+	exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
+
+	exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
+
+	exec_control &= ~CPU_BASED_TPR_SHADOW;
+
+	exec_control |= src->cpu_based_vm_exec_control;
+
+	if (!vm_need_tpr_shadow(vcpu->kvm) ||
+	    src->virtual_apic_page_addr == 0) {
+		exec_control &= ~CPU_BASED_TPR_SHADOW;
+#ifdef CONFIG_X86_64
+		exec_control |= CPU_BASED_CR8_STORE_EXITING |
+			CPU_BASED_CR8_LOAD_EXITING;
+#endif
+	} else if (exec_control & CPU_BASED_TPR_SHADOW) {
+
+#ifdef CONFIG_X86_64
+		exec_control &= ~CPU_BASED_CR8_STORE_EXITING;
+		exec_control &= ~CPU_BASED_CR8_LOAD_EXITING;
+#endif
+	}
+
+	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
+
+	vmcs_write32(EXCEPTION_BITMAP,
+		     (vmx->nested.l1_state->shadow_vmcs->exception_bitmap |
+		      src->exception_bitmap));
+
+	vmcs_write32(VM_EXIT_CONTROLS,
+		     ((vmx->nested.l1_state->shadow_vmcs->vm_exit_controls &
+		       NESTED_VM_EXIT_CONTROLS_MASK) | src->vm_exit_controls));
+
+	vmcs_write32(VM_ENTRY_CONTROLS,
+		     (vmx->nested.l1_state->shadow_vmcs->vm_entry_controls &
+		      NESTED_VM_ENTRY_CONTROLS_MASK) | src->vm_entry_controls);
+
+	vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, src->vm_entry_msr_load_count);
+
+	vmcs_writel(CR0_GUEST_HOST_MASK,
+		    (vmx->nested.l1_state->shadow_vmcs->cr0_guest_host_mask  &
+		     src->cr0_guest_host_mask));
+	vmcs_writel(CR4_GUEST_HOST_MASK,
+		    (vmx->nested.l1_state->shadow_vmcs->cr4_guest_host_mask  &
+		     src->cr4_guest_host_mask));
+
+	return 0;
+}
+
+int switch_back_vmcs(struct kvm_vcpu *vcpu)
+{
+	struct shadow_vmcs *src = to_vmx(vcpu)->nested.l1_state->shadow_vmcs;
+
+	if (enable_vpid && src->virtual_processor_id != 0)
+		vmcs_write16(VIRTUAL_PROCESSOR_ID, src->virtual_processor_id);
+
+	vmcs_write64(IO_BITMAP_A, src->io_bitmap_a);
+	vmcs_write64(IO_BITMAP_B, src->io_bitmap_b);
+
+	if (cpu_has_vmx_msr_bitmap())
+		vmcs_write64(MSR_BITMAP, src->msr_bitmap);
+
+	vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, src->virtual_apic_page_addr);
+
+	if (vm_need_virtualize_apic_accesses(vcpu->kvm))
+		vmcs_write64(APIC_ACCESS_ADDR,
+			     src->apic_access_addr);
+
+	if (enable_ept) {
+		vmcs_write64(EPT_POINTER, src->ept_pointer);
+		vmcs_write64(GUEST_PDPTR0, src->guest_pdptr0);
+		vmcs_write64(GUEST_PDPTR1, src->guest_pdptr1);
+		vmcs_write64(GUEST_PDPTR2, src->guest_pdptr2);
+		vmcs_write64(GUEST_PDPTR3, src->guest_pdptr3);
+	}
+
+	vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, src->pin_based_vm_exec_control);
+	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, src->cpu_based_vm_exec_control);
+	vmcs_write32(EXCEPTION_BITMAP, src->exception_bitmap);
+	vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK,
+		     src->page_fault_error_code_mask);
+	vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH,
+		     src->page_fault_error_code_match);
+	vmcs_write32(VM_EXIT_CONTROLS, src->vm_exit_controls);
+	vmcs_write32(VM_ENTRY_CONTROLS, src->vm_entry_controls);
+	vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, src->vm_entry_msr_load_count);
+
+	if (cpu_has_secondary_exec_ctrls())
+		vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
+			     src->secondary_vm_exec_control);
+
+	load_vmcs_common(src);
+
+	load_vmcs_host_state(to_vmx(vcpu)->nested.l1_state->shadow_vmcs);
+
+	return 0;
+}
+
+void sync_cached_regs_to_vmcs(struct kvm_vcpu *vcpu)
+{
+	unsigned long mask;
+
+	if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
+		vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
+	if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
+		vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
+
+	mask = ~((1 << VCPU_REGS_RSP) | (1 << VCPU_REGS_RIP));
+
+	if (vcpu->arch.regs_dirty & mask) {
+		printk(KERN_INFO "WARNING: dirty cached registers regs_dirty 0x%x mask 0x%lx\n",
+		       vcpu->arch.regs_dirty, mask);
+		WARN_ON(1);
+	}
+
+	vcpu->arch.regs_dirty = 0;
+}
+
+static int nested_vmx_run(struct kvm_vcpu *vcpu)
+{
+	/* verify that l1 has done vmptrld for l2 earlier */
+	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	int initial_pfu_active = vcpu->fpu_active;
+	int r = 0;
+
+	if (vmx->nested.nested_mode) {
+		printk(KERN_INFO "Nested guest already running\n");
+		set_rflags_to_vmx_fail_valid(vcpu);
+		return 1;
+	}
+
+
+	vmx->nested.nested_mode = 1;
+
+	vcpu->arch.exception.pending = false;
+
+	sync_cached_regs_to_vmcs(vcpu);
+
+	save_vmcs(vmx->nested.l1_state->shadow_vmcs);
+
+	vmx->nested.l1_state->shadow_efer = vcpu->arch.shadow_efer;
+	if (!enable_ept)
+		vmx->nested.l1_state->cr3 = vcpu->arch.cr3;
+	vmx->nested.l1_state->cr4 = vcpu->arch.cr4;
+
+	if (enable_vpid) {
+		if (vmx->nested.l2_state->vpid == 0) {
+			allocate_vpid(vmx);
+			vmx->nested.l2_state->vpid = vmx->vpid;
+		}
+	}
+
+	if (cpu_has_vmx_msr_bitmap())
+		vmx->nested.l1_state->msr_bitmap = vmcs_read64(MSR_BITMAP);
+	else
+		vmx->nested.l1_state->msr_bitmap = 0;
+
+	vmx->nested.l1_state->io_bitmap_a = vmcs_read64(IO_BITMAP_A);
+	vmx->nested.l1_state->io_bitmap_b = vmcs_read64(IO_BITMAP_B);
+	vmx->nested.l1_state->vmcs = vmx->vmcs;
+	vmx->nested.l1_state->cpu = vcpu->cpu;
+	vmx->nested.l1_state->launched = vmx->launched;
+
+	vmx->vmcs = vmx->nested.l2_state->vmcs;
+	vcpu->cpu = vmx->nested.l2_state->cpu;
+	vmx->launched = vmx->nested.l2_state->launched;
+
+	if (vmx->nested.l2_state->vmclear || !vmx->launched) {
+		vmcs_clear(vmx->vmcs);
+		vmx->launched = 0;
+		vmx->nested.l2_state->vmclear = 0;
+	}
+
+	vmx_vcpu_load(vcpu, get_cpu());
+	put_cpu();
+
+
+	if (!nested_map_shadow_vmcs(vcpu)) {
+		set_rflags_to_vmx_fail_valid(vcpu);
+		return 1;
+	}
+
+	prepare_vmcs_02(vcpu);
+
+	if (get_shadow_vmcs(vcpu)->vm_entry_controls &
+	    VM_ENTRY_IA32E_MODE) {
+		if (!((vcpu->arch.shadow_efer & EFER_LMA) &&
+		      (vcpu->arch.shadow_efer & EFER_LME)))
+			vcpu->arch.shadow_efer |= (EFER_LMA | EFER_LME);
+	} else {
+		if ((vcpu->arch.shadow_efer & EFER_LMA) ||
+		    (vcpu->arch.shadow_efer & EFER_LME))
+			vcpu->arch.shadow_efer = 0;
+	}
+
+	vmx_set_cr0(vcpu, get_shadow_vmcs(vcpu)->guest_cr0);
+	vmcs_writel(CR0_READ_SHADOW,
+		    get_shadow_vmcs(vcpu)->cr0_read_shadow);
+	vmx_set_cr4(vcpu, get_shadow_vmcs(vcpu)->guest_cr4);
+	vmcs_writel(CR4_READ_SHADOW,
+		    get_shadow_vmcs(vcpu)->cr4_read_shadow);
+
+	vcpu->arch.cr0 |= X86_CR0_PG;
+
+	if (enable_ept && !nested_cpu_has_vmx_ept(vcpu)) {
+		vmcs_write32(GUEST_CR3, get_shadow_vmcs(vcpu)->guest_cr3);
+		vmx->vcpu.arch.cr3 = get_shadow_vmcs(vcpu)->guest_cr3;
+	} else {
+		kvm_set_cr3(vcpu, get_shadow_vmcs(vcpu)->guest_cr3);
+		kvm_mmu_reset_context(vcpu);
+
+		nested_unmap_shadow_vmcs(vcpu);
+
+		r = kvm_mmu_load(vcpu);
+		if (unlikely(r)) {
+			printk(KERN_ERR "Error in kvm_mmu_load r %d\n", r);
+			nested_vmx_vmexit(vcpu, false);
+			set_rflags_to_vmx_fail_valid(vcpu);
+			return 1;
+		}
+
+		nested_map_shadow_vmcs(vcpu);
+	}
+
+	kvm_register_write(vcpu, VCPU_REGS_RSP,
+			   get_shadow_vmcs(vcpu)->guest_rsp);
+	kvm_register_write(vcpu, VCPU_REGS_RIP,
+			   get_shadow_vmcs(vcpu)->guest_rip);
+
+	vmcs_write32(EXCEPTION_BITMAP,
+		     (vmx->nested.l1_state->shadow_vmcs->exception_bitmap |
+		      get_shadow_vmcs(vcpu)->exception_bitmap));
+
+	nested_unmap_shadow_vmcs(vcpu);
+
+	if (initial_pfu_active)
+		vmx_fpu_activate(vcpu);
+
+	return 1;
+}
+
+static int launch_guest(struct kvm_vcpu *vcpu)
+{
+	if (!nested_vmx_check_permission(vcpu))
+		return 1;
+
+	skip_emulated_instruction(vcpu);
+
+	nested_vmx_run(vcpu);
+
+	return 1;
+}
+
+static int nested_vmx_vmexit(struct kvm_vcpu *vcpu,
+			     bool is_interrupt)
+{
+	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	int initial_pfu_active = vcpu->fpu_active;
+
+	if (!vmx->nested.nested_mode) {
+		printk(KERN_INFO "WARNING: %s called but not in nested mode\n",
+		       __func__);
+		return 0;
+	}
+
+	save_msrs(vmx->guest_msrs, vmx->save_nmsrs);
+
+	sync_cached_regs_to_vmcs(vcpu);
+
+	if (!nested_map_shadow_vmcs(vcpu)) {
+		printk(KERN_INFO "Error mapping shadow vmcs\n");
+		set_rflags_to_vmx_fail_valid(vcpu);
+		return 1;
+	}
+
+	prepare_vmcs_12(vcpu);
+	if (is_interrupt)
+		get_shadow_vmcs(vcpu)->vm_exit_reason =
+			EXIT_REASON_EXTERNAL_INTERRUPT;
+
+	vmx->nested.l2_state->launched = vmx->launched;
+	vmx->nested.l2_state->cpu = vcpu->cpu;
+
+	nested_unmap_shadow_vmcs(vcpu);
+
+	vmx->vmcs = vmx->nested.l1_state->vmcs;
+	vcpu->cpu = vmx->nested.l1_state->cpu;
+	vmx->launched = vmx->nested.l1_state->launched;
+
+	vmx_vcpu_load(vcpu, get_cpu());
+	put_cpu();
+
+	vcpu->arch.exception.pending = false;
+
+	vcpu->arch.shadow_efer = vmx->nested.l1_state->shadow_efer;
+	vmx_set_cr0(vcpu, vmx->nested.l1_state->shadow_vmcs->cr0_read_shadow);
+	vmx_set_cr4(vcpu, vmx->nested.l1_state->cr4);
+
+	if (enable_ept) {
+		vcpu->arch.cr3 = vmx->nested.l1_state->shadow_vmcs->guest_cr3;
+		vmcs_write32(GUEST_CR3, vmx->nested.l1_state->shadow_vmcs->guest_cr3);
+	} else {
+		kvm_set_cr3(vcpu, vmx->nested.l1_state->cr3);
+	}
+
+	if (!nested_map_shadow_vmcs(vcpu)) {
+		printk(KERN_INFO "Error mapping shadow vmcs\n");
+		set_rflags_to_vmx_fail_valid(vcpu);
+		return 1;
+	}
+
+	switch_back_vmcs(vcpu);
+
+	nested_unmap_shadow_vmcs(vcpu);
+
+	kvm_register_write(vcpu, VCPU_REGS_RSP,
+			   vmx->nested.l1_state->shadow_vmcs->guest_rsp);
+	kvm_register_write(vcpu, VCPU_REGS_RIP,
+			   vmx->nested.l1_state->shadow_vmcs->guest_rip);
+
+	vmx->nested.nested_mode = 0;
+
+	kvm_mmu_reset_context(vcpu);
+	kvm_mmu_load(vcpu);
+
+	if (unlikely(vmx->fail)) {
+		vmx->fail = 0;
+		set_rflags_to_vmx_fail_valid(vcpu);
+	} else
+		clear_rflags_cf_zf(vcpu);
+
+	if (initial_pfu_active)
+		vmx_fpu_activate(vcpu);
+
+	return 0;
+}
+
+static int nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu)
+{
+	if (to_vmx(vcpu)->nested.nested_mode) {
+		struct page *msr_page = NULL;
+		u32 msr_index = vcpu->arch.regs[VCPU_REGS_RCX];
+		u32 exit_code = vmcs_read32(VM_EXIT_REASON);
+		struct shadow_vmcs *l2svmcs = get_shadow_vmcs(vcpu);
+
+		if (!cpu_has_vmx_msr_bitmap()
+		    || !nested_cpu_has_vmx_msr_bitmap(vcpu))
+			return 1;
+
+		msr_page = nested_get_page(vcpu,
+					   l2svmcs->msr_bitmap);
+
+		if (!msr_page) {
+			printk(KERN_INFO "%s error in nested_get_page\n",
+			       __func__);
+			return 0;
+		}
+
+		switch (exit_code) {
+		case EXIT_REASON_MSR_READ:
+			if (msr_index <= 0x1fff) {
+				if (test_bit(msr_index,
+					     (unsigned long *)(msr_page +
+							       0x000)))
+					return 1;
+			} else if ((msr_index >= 0xc0000000) &&
+				   (msr_index <= 0xc0001fff)) {
+				msr_index &= 0x1fff;
+				if (test_bit(msr_index,
+					     (unsigned long *)(msr_page +
+							       0x400)))
+					return 1;
+			}
+			break;
+		case EXIT_REASON_MSR_WRITE:
+			if (msr_index <= 0x1fff) {
+				if (test_bit(msr_index,
+					     (unsigned long *)(msr_page +
+							       0x800)))
+						return 1;
+			} else if ((msr_index >= 0xc0000000) &&
+				   (msr_index <= 0xc0001fff)) {
+				msr_index &= 0x1fff;
+				if (test_bit(msr_index,
+					     (unsigned long *)(msr_page +
+							       0xc00)))
+					return 1;
+			}
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static int nested_vmx_exit_handled(struct kvm_vcpu *vcpu, bool kvm_override)
+{
+	u32 exit_code = vmcs_read32(VM_EXIT_REASON);
+	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	u32 intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
+	struct shadow_vmcs *l2svmcs;
+
+	int r = 0;
+
+	if (vmx->nested.nested_run_pending)
+		return 0;
+
+	if (unlikely(vmx->fail)) {
+		printk(KERN_INFO "%s failed vm entry %x\n",
+		       __func__, vmcs_read32(VM_INSTRUCTION_ERROR));
+		return 1;
+	}
+
+	if (kvm_override) {
+		switch (exit_code) {
+		case EXIT_REASON_EXTERNAL_INTERRUPT:
+			return 0;
+		case EXIT_REASON_EXCEPTION_NMI:
+			if (!is_exception(intr_info))
+				return 0;
+
+			if (is_page_fault(intr_info) && (!enable_ept))
+				return 0;
+
+			break;
+		case EXIT_REASON_EPT_VIOLATION:
+			if (enable_ept)
+				return 0;
+
+			break;
+		}
+	}
+
+
+	if (!nested_map_shadow_vmcs(vcpu))
+		return 0;
+	l2svmcs = get_shadow_vmcs(vcpu);
+
+	switch (exit_code) {
+	case EXIT_REASON_INVLPG:
+		if (l2svmcs->cpu_based_vm_exec_control &
+		    CPU_BASED_INVLPG_EXITING)
+			r = 1;
+		break;
+	case EXIT_REASON_MSR_READ:
+	case EXIT_REASON_MSR_WRITE:
+		r = nested_vmx_exit_handled_msr(vcpu);
+		break;
+	case EXIT_REASON_CR_ACCESS: {
+		unsigned long exit_qualification =
+			vmcs_readl(EXIT_QUALIFICATION);
+		int cr = exit_qualification & 15;
+		int reg = (exit_qualification >> 8) & 15;
+		unsigned long val = kvm_register_read(vcpu, reg);
+
+		switch ((exit_qualification >> 4) & 3) {
+		case 0: /* mov to cr */
+			switch (cr) {
+			case 0:
+				if (l2svmcs->cr0_guest_host_mask &
+				    (val ^ l2svmcs->cr0_read_shadow))
+					r = 1;
+				break;
+			case 3:
+				if (l2svmcs->cpu_based_vm_exec_control &
+				    CPU_BASED_CR3_LOAD_EXITING)
+					r = 1;
+				break;
+			case 4:
+				if (l2svmcs->cr4_guest_host_mask &
+				    (l2svmcs->cr4_read_shadow ^ val))
+					r = 1;
+				break;
+			case 8:
+				if (l2svmcs->cpu_based_vm_exec_control &
+				    CPU_BASED_CR8_LOAD_EXITING)
+					r = 1;
+				break;
+			}
+			break;
+		case 2: /* clts */
+			if (l2svmcs->cr0_guest_host_mask &
+			    (val ^ l2svmcs->cr0_read_shadow))
+				r = 1;
+			break;
+		case 1: /*mov from cr*/
+			switch (cr) {
+			case 0:
+				r = 1;
+			case 3:
+				if (l2svmcs->cpu_based_vm_exec_control &
+				    CPU_BASED_CR3_STORE_EXITING)
+					r = 1;
+				break;
+			case 4:
+				r = 1;
+				break;
+			case 8:
+				if (l2svmcs->cpu_based_vm_exec_control &
+				    CPU_BASED_CR8_STORE_EXITING)
+					r = 1;
+				break;
+			}
+			break;
+		case 3: /* lmsw */
+			if (l2svmcs->cr0_guest_host_mask &
+			    (val ^ l2svmcs->cr0_read_shadow))
+				r = 1;
+			break;
+		}
+		break;
+	}
+	case EXIT_REASON_DR_ACCESS: {
+		if (l2svmcs->cpu_based_vm_exec_control &
+		    CPU_BASED_MOV_DR_EXITING)
+			r = 1;
+		break;
+	}
+
+	case EXIT_REASON_EXCEPTION_NMI: {
+
+		if (is_external_interrupt(intr_info) &&
+		    (l2svmcs->pin_based_vm_exec_control &
+		     PIN_BASED_EXT_INTR_MASK))
+			r = 1;
+		else if (is_nmi(intr_info) &&
+		    (l2svmcs->pin_based_vm_exec_control &
+		     PIN_BASED_NMI_EXITING))
+			r = 1;
+		else if (is_exception(intr_info) &&
+		    (l2svmcs->exception_bitmap &
+		     (1u << (intr_info & INTR_INFO_VECTOR_MASK))))
+			r = 1;
+		else if (is_page_fault(intr_info))
+			r = 1;
+		break;
+	}
+
+	case EXIT_REASON_EXTERNAL_INTERRUPT:
+		if (l2svmcs->pin_based_vm_exec_control &
+		    PIN_BASED_EXT_INTR_MASK)
+			r = 1;
+		break;
+	default:
+		r = 1;
+	}
+	nested_unmap_shadow_vmcs(vcpu);
+
+	return r;
+}
+
+static int nested_vmx_check_exception(struct vcpu_vmx *vmx, unsigned nr,
+				      bool has_error_code, u32 error_code)
+{
+	if (vmx->nested.nested_mode) {
+		if (nested_vmx_exit_handled(&vmx->vcpu, false)) {
+			nested_vmx_vmexit(&vmx->vcpu, false);
+			if (!nested_map_shadow_vmcs(&vmx->vcpu))
+				return 1;
+			get_shadow_vmcs(&vmx->vcpu)->vm_exit_reason =
+				EXIT_REASON_EXCEPTION_NMI;
+			get_shadow_vmcs(&vmx->vcpu)->vm_exit_intr_info =
+				(nr | INTR_TYPE_HARD_EXCEPTION
+				 | (has_error_code ?
+				    INTR_INFO_DELIVER_CODE_MASK : 0)
+				 | INTR_INFO_VALID_MASK);
+
+			if (has_error_code)
+				get_shadow_vmcs(&vmx->vcpu)->
+					vm_exit_intr_error_code = error_code;
+			nested_unmap_shadow_vmcs(&vmx->vcpu);
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static int nested_vmx_intr(struct kvm_vcpu *vcpu)
+{
+	struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+	if (vmx->nested.nested_mode) {
+
+		if (!nested_map_shadow_vmcs(vcpu))
+			return 0;
+
+		if (get_shadow_vmcs(vcpu)->pin_based_vm_exec_control &
+		    PIN_BASED_EXT_INTR_MASK) {
+
+			if (vmx->nested.nested_run_pending) {
+				nested_unmap_shadow_vmcs(vcpu);
+				return 0;
+			}
+
+			nested_unmap_shadow_vmcs(vcpu);
+			nested_vmx_vmexit(vcpu, true);
+			return 1;		
+		}
+
+		nested_unmap_shadow_vmcs(vcpu);
+
+	}
+
+	return 0;
+}
 
 static struct kvm_x86_ops vmx_x86_ops = {
 	.cpu_has_kvm_support = cpu_has_kvm_support,
-- 
1.6.0.4