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Commit 27d6c865 authored by Nadav Har'El's avatar Nadav Har'El Committed by Avi Kivity
Browse files

KVM: nVMX: Implement VMCLEAR 



This patch implements the VMCLEAR instruction.

Signed-off-by: default avatarNadav Har'El <nyh@il.ibm.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 0140caea

arch/x86/kvm/vmx.c

+64 −1
Original line number Diff line number Diff line
@@ -166,6 +166,9 @@ struct __packed vmcs12 { 
	u32 revision_id;

	u32 abort;



	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;
@@ -4814,6 +4817,66 @@ static void nested_vmx_failValid(struct kvm_vcpu *vcpu, 
	get_vmcs12(vcpu)->vm_instruction_error = vm_instruction_error;

}



/* Emulate the VMCLEAR instruction */

static int handle_vmclear(struct kvm_vcpu *vcpu)

{

	struct vcpu_vmx *vmx = to_vmx(vcpu);

	gva_t gva;

	gpa_t vmptr;

	struct vmcs12 *vmcs12;

	struct page *page;

	struct x86_exception e;



	if (!nested_vmx_check_permission(vcpu))

		return 1;



	if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),

			vmcs_read32(VMX_INSTRUCTION_INFO), &gva))

		return 1;



	if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr,

				sizeof(vmptr), &e)) {

		kvm_inject_page_fault(vcpu, &e);

		return 1;

	}



	if (!IS_ALIGNED(vmptr, PAGE_SIZE)) {

		nested_vmx_failValid(vcpu, VMXERR_VMCLEAR_INVALID_ADDRESS);

		skip_emulated_instruction(vcpu);

		return 1;

	}



	if (vmptr == vmx->nested.current_vmptr) {

		kunmap(vmx->nested.current_vmcs12_page);

		nested_release_page(vmx->nested.current_vmcs12_page);

		vmx->nested.current_vmptr = -1ull;

		vmx->nested.current_vmcs12 = NULL;

	}



	page = nested_get_page(vcpu, vmptr);

	if (page == NULL) {

		/*

		 * For accurate processor emulation, VMCLEAR beyond available

		 * physical memory should do nothing at all. However, it is

		 * possible that a nested vmx bug, not a guest hypervisor bug,

		 * resulted in this case, so let's shut down before doing any

		 * more damage:

		 */

		kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);

		return 1;

	}

	vmcs12 = kmap(page);

	vmcs12->launch_state = 0;

	kunmap(page);

	nested_release_page(page);



	nested_free_vmcs02(vmx, vmptr);



	skip_emulated_instruction(vcpu);

	nested_vmx_succeed(vcpu);

	return 1;

}



/*

 * The exit handlers return 1 if the exit was handled fully and guest execution

 * may resume.  Otherwise they set the kvm_run parameter to indicate what needs
@@ -4835,7 +4898,7 @@ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = { 
	[EXIT_REASON_INVD]		      = handle_invd,

	[EXIT_REASON_INVLPG]		      = handle_invlpg,

	[EXIT_REASON_VMCALL]                  = handle_vmcall,

	[EXIT_REASON_VMCLEAR]	              = handle_vmx_insn,

	[EXIT_REASON_VMCLEAR]	              = handle_vmclear,

	[EXIT_REASON_VMLAUNCH]                = handle_vmx_insn,

	[EXIT_REASON_VMPTRLD]                 = handle_vmx_insn,

	[EXIT_REASON_VMPTRST]                 = handle_vmx_insn,

arch/x86/kvm/x86.c

+1 −0
Original line number Diff line number Diff line
@@ -347,6 +347,7 @@ void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) 
	vcpu->arch.cr2 = fault->address;

	kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code);

}

EXPORT_SYMBOL_GPL(kvm_inject_page_fault);



void kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)

{