[13/28] nVMX: Implement VMPTRST

Commit Message

Nadav Har'El Dec. 8, 2010, 5:06 p.m. UTC

None

Patch

--- .before/arch/x86/kvm/x86.c	2010-12-08 18:56:50.000000000 +0200
+++ .after/arch/x86/kvm/x86.c	2010-12-08 18:56:50.000000000 +0200
@@ -3705,7 +3705,7 @@  static int kvm_read_guest_virt_system(gv
 	return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception);
 }
 
-static int kvm_write_guest_virt_system(gva_t addr, void *val,
+int kvm_write_guest_virt_system(gva_t addr, void *val,
 				       unsigned int bytes,
 				       struct kvm_vcpu *vcpu,
 				       struct x86_exception *exception)
@@ -3736,6 +3736,7 @@  static int kvm_write_guest_virt_system(g
 out:
 	return r;
 }
+EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
 
 static int emulator_read_emulated(unsigned long addr,
 				  void *val,
--- .before/arch/x86/kvm/x86.h	2010-12-08 18:56:50.000000000 +0200
+++ .after/arch/x86/kvm/x86.h	2010-12-08 18:56:50.000000000 +0200
@@ -77,6 +77,9 @@  int kvm_inject_realmode_interrupt(struct
 int kvm_read_guest_virt(gva_t addr, void *val, unsigned int bytes,
 		struct kvm_vcpu *vcpu, struct x86_exception *exception);
 
+int kvm_write_guest_virt_system(gva_t addr, void *val, unsigned int bytes,
+		struct kvm_vcpu *vcpu, struct x86_exception *exception);
+
 void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data);
 
 #endif
--- .before/arch/x86/kvm/vmx.c	2010-12-08 18:56:50.000000000 +0200
+++ .after/arch/x86/kvm/vmx.c	2010-12-08 18:56:50.000000000 +0200
@@ -4530,6 +4530,31 @@  static int handle_vmptrld(struct kvm_vcp
 	return 1;
 }
 
+/* Emulate the VMPTRST instruction */
+static int handle_vmptrst(struct kvm_vcpu *vcpu)
+{
+	unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
+	u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
+	gva_t vmcs_gva;
+
+	if (!nested_vmx_check_permission(vcpu))
+		return 1;
+
+	if (get_vmx_mem_address(vcpu, exit_qualification,
+			vmx_instruction_info, &vmcs_gva))
+		return 1;
+	/* ok to use *_system, because handle_vmread verified cpl=0 */
+	if (kvm_write_guest_virt_system(vmcs_gva,
+				 (void *)&to_vmx(vcpu)->nested.current_vmptr,
+				 sizeof(u64), vcpu, NULL)) {
+		kvm_queue_exception(vcpu, PF_VECTOR);
+		return 1;
+	}
+	nested_vmx_succeed(vcpu);
+	skip_emulated_instruction(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
@@ -4554,7 +4579,7 @@  static int (*kvm_vmx_exit_handlers[])(st
 	[EXIT_REASON_VMCLEAR]	              = handle_vmclear,
 	[EXIT_REASON_VMLAUNCH]                = handle_vmx_insn,
 	[EXIT_REASON_VMPTRLD]                 = handle_vmptrld,
-	[EXIT_REASON_VMPTRST]                 = handle_vmx_insn,
+	[EXIT_REASON_VMPTRST]                 = handle_vmptrst,
 	[EXIT_REASON_VMREAD]                  = handle_vmx_insn,
 	[EXIT_REASON_VMRESUME]                = handle_vmx_insn,
 	[EXIT_REASON_VMWRITE]                 = handle_vmx_insn,