KVM: nVMX: Remove non-functional "support" for CR3 target values

Remove all references to cr3_target_value[0-3] and replace the fields
in vmcs12 with "dead_space" to preserve the vmcs12 layout.  KVM doesn't
support emulating CR3-target values, despite a variety of code that
implies otherwise, as KVM unconditionally reports '0' for the number of
supported CR3-target values.

This technically fixes a bug where KVM would incorrectly allow VMREAD
and VMWRITE to nonexistent fields, i.e. cr3_target_value[0-3].  Per
Intel's SDM, the number of supported CR3-target values reported in
VMX_MISC also enumerates the existence of the associated VMCS fields:

  If a future implementation supports more than 4 CR3-target values, they
  will be encoded consecutively following the 4 encodings given here.

Alternatively, the "bug" could be fixed by actually advertisting support
for 4 CR3-target values, but that'd likely just enable kvm-unit-tests
given that no one has complained about lack of support for going on ten
years, e.g. KVM, Xen and HyperV don't use CR3-target values.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200416000739.9012-1-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Documentation/virt/kvm/nested-vmx.rst

@@ -116,10 +116,7 @@ struct shadow_vmcs is ever changed.
 		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 dead_space[4]; /* Last remnants of cr3_target_value[0-3]. */
 		natural_width exit_qualification;
 		natural_width guest_linear_address;
 		natural_width guest_cr0;

arch/x86/kvm/vmx/evmcs.c

@@ -160,14 +160,6 @@ const struct evmcs_field vmcs_field_to_evmcs_1[] = {
 		     HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL),
 	EVMCS1_FIELD(VM_ENTRY_MSR_LOAD_ADDR, vm_entry_msr_load_addr,
 		     HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL),
-	EVMCS1_FIELD(CR3_TARGET_VALUE0, cr3_target_value0,
-		     HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL),
-	EVMCS1_FIELD(CR3_TARGET_VALUE1, cr3_target_value1,
-		     HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL),
-	EVMCS1_FIELD(CR3_TARGET_VALUE2, cr3_target_value2,
-		     HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL),
-	EVMCS1_FIELD(CR3_TARGET_VALUE3, cr3_target_value3,
-		     HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL),
 
 	/* 32 bit rw */
 	EVMCS1_FIELD(TPR_THRESHOLD, tpr_threshold,

arch/x86/kvm/vmx/nested.c

@@ -1785,10 +1785,6 @@ static int copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx)
 	 * vmcs12->vm_exit_msr_store_addr = evmcs->vm_exit_msr_store_addr;
 	 * vmcs12->vm_exit_msr_load_addr = evmcs->vm_exit_msr_load_addr;
 	 * vmcs12->vm_entry_msr_load_addr = evmcs->vm_entry_msr_load_addr;
-	 * vmcs12->cr3_target_value0 = evmcs->cr3_target_value0;
-	 * vmcs12->cr3_target_value1 = evmcs->cr3_target_value1;
-	 * vmcs12->cr3_target_value2 = evmcs->cr3_target_value2;
-	 * vmcs12->cr3_target_value3 = evmcs->cr3_target_value3;
 	 * vmcs12->page_fault_error_code_mask =
 	 *		evmcs->page_fault_error_code_mask;
 	 * vmcs12->page_fault_error_code_match =
@@ -1862,10 +1858,6 @@ static int copy_vmcs12_to_enlightened(struct vcpu_vmx *vmx)
 	 * evmcs->vm_exit_msr_store_addr = vmcs12->vm_exit_msr_store_addr;
 	 * evmcs->vm_exit_msr_load_addr = vmcs12->vm_exit_msr_load_addr;
 	 * evmcs->vm_entry_msr_load_addr = vmcs12->vm_entry_msr_load_addr;
-	 * evmcs->cr3_target_value0 = vmcs12->cr3_target_value0;
-	 * evmcs->cr3_target_value1 = vmcs12->cr3_target_value1;
-	 * evmcs->cr3_target_value2 = vmcs12->cr3_target_value2;
-	 * evmcs->cr3_target_value3 = vmcs12->cr3_target_value3;
 	 * evmcs->tpr_threshold = vmcs12->tpr_threshold;
 	 * evmcs->virtual_processor_id = vmcs12->virtual_processor_id;
 	 * evmcs->exception_bitmap = vmcs12->exception_bitmap;
@@ -5541,15 +5533,6 @@ static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu,
 				return true;
 			break;
 		case 3:
-			if ((vmcs12->cr3_target_count >= 1 &&
-					vmcs12->cr3_target_value0 == val) ||
-				(vmcs12->cr3_target_count >= 2 &&
-					vmcs12->cr3_target_value1 == val) ||
-				(vmcs12->cr3_target_count >= 3 &&
-					vmcs12->cr3_target_value2 == val) ||
-				(vmcs12->cr3_target_count >= 4 &&
-					vmcs12->cr3_target_value3 == val))
-				return false;
 			if (nested_cpu_has(vmcs12, CPU_BASED_CR3_LOAD_EXITING))
 				return true;
 			break;

arch/x86/kvm/vmx/vmcs12.c

@@ -115,10 +115,6 @@ const unsigned short vmcs_field_to_offset_table[] = {
 	FIELD(CR4_GUEST_HOST_MASK, cr4_guest_host_mask),
 	FIELD(CR0_READ_SHADOW, cr0_read_shadow),
 	FIELD(CR4_READ_SHADOW, cr4_read_shadow),
-	FIELD(CR3_TARGET_VALUE0, cr3_target_value0),
-	FIELD(CR3_TARGET_VALUE1, cr3_target_value1),
-	FIELD(CR3_TARGET_VALUE2, cr3_target_value2),
-	FIELD(CR3_TARGET_VALUE3, cr3_target_value3),
 	FIELD(EXIT_QUALIFICATION, exit_qualification),
 	FIELD(GUEST_LINEAR_ADDRESS, guest_linear_address),
 	FIELD(GUEST_CR0, guest_cr0),

arch/x86/kvm/vmx/vmcs12.h

@@ -80,10 +80,7 @@ struct __packed vmcs12 {
 	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 dead_space[4]; /* Last remnants of cr3_target_value[0-3]. */
 	natural_width exit_qualification;
 	natural_width guest_linear_address;
 	natural_width guest_cr0;
@@ -263,10 +260,7 @@ static inline void vmx_check_vmcs12_offsets(void)
 	CHECK_OFFSET(cr4_guest_host_mask, 352);
 	CHECK_OFFSET(cr0_read_shadow, 360);
 	CHECK_OFFSET(cr4_read_shadow, 368);
-	CHECK_OFFSET(cr3_target_value0, 376);
-	CHECK_OFFSET(cr3_target_value1, 384);
-	CHECK_OFFSET(cr3_target_value2, 392);
-	CHECK_OFFSET(cr3_target_value3, 400);
+	CHECK_OFFSET(dead_space, 376);
 	CHECK_OFFSET(exit_qualification, 408);
 	CHECK_OFFSET(guest_linear_address, 416);
 	CHECK_OFFSET(guest_cr0, 424);

arch/x86/kvm/vmx/vmx.c

@@ -5717,7 +5717,6 @@ void dump_vmcs(void)
 	u32 cpu_based_exec_ctrl, pin_based_exec_ctrl, secondary_exec_control;
 	unsigned long cr4;
 	u64 efer;
-	int i, n;
 
 	if (!dump_invalid_vmcs) {
 		pr_warn_ratelimited("set kvm_intel.dump_invalid_vmcs=1 to dump internal KVM state.\n");
@@ -5854,14 +5853,6 @@ void dump_vmcs(void)
 		pr_err("PostedIntrVec = 0x%02x\n", vmcs_read16(POSTED_INTR_NV));
 	if ((secondary_exec_control & SECONDARY_EXEC_ENABLE_EPT))
 		pr_err("EPT pointer = 0x%016llx\n", vmcs_read64(EPT_POINTER));
-	n = vmcs_read32(CR3_TARGET_COUNT);
-	for (i = 0; i + 1 < n; i += 4)
-		pr_err("CR3 target%u=%016lx target%u=%016lx\n",
-		       i, vmcs_readl(CR3_TARGET_VALUE0 + i * 2),
-		       i + 1, vmcs_readl(CR3_TARGET_VALUE0 + i * 2 + 2));
-	if (i < n)
-		pr_err("CR3 target%u=%016lx\n",
-		       i, vmcs_readl(CR3_TARGET_VALUE0 + i * 2));
 	if (secondary_exec_control & SECONDARY_EXEC_PAUSE_LOOP_EXITING)
 		pr_err("PLE Gap=%08x Window=%08x\n",
 		       vmcs_read32(PLE_GAP), vmcs_read32(PLE_WINDOW));