On 01/27/2011 10:35 AM, Nadav Har'El wrote:
This patch implements the VMCLEAR instruction.
+/* Emulate the VMCLEAR instruction */
+static int handle_vmclear(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ gva_t gva;
+ gpa_t vmcs12_addr;
+ struct vmcs12 *vmcs12;
+ struct page *page;
+
+ 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(gva,&vmcs12_addr, sizeof(vmcs12_addr),
+ vcpu, NULL)) {
+ kvm_queue_exception(vcpu, PF_VECTOR);
This generates an exception without an error code. Use the 'struct
x86_exception' parameter to kvm_read_guest_virt() to obtain the correct
exception/error code pair.
+ return 1;
+ }
+
+ if (!IS_ALIGNED(vmcs12_addr, PAGE_SIZE)) {
+ nested_vmx_failValid(vcpu, VMXERR_VMCLEAR_INVALID_ADDRESS);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ }
+
+ if (vmcs12_addr == vmx->nested.current_vmptr) {
+ kunmap(vmx->nested.current_vmcs12_page);
+ nested_release_page(vmx->nested.current_vmcs12_page);
+ vmx->nested.current_vmptr = -1ull;
+ }
+
+ page = nested_get_page(vcpu, vmcs12_addr);
+ 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);
+ nested_release_page(page);
nested_release_page(NULL) unneeded.
+ return 1;
+ }
+ vmcs12 = kmap(page);
+ vmcs12->launch_state = 0;
+ kunmap(page);
+ nested_release_page(page);
+
+ nested_free_vmcs(vmx, vmcs12_addr);
+
+ skip_emulated_instruction(vcpu);
+ nested_vmx_succeed(vcpu);
+ return 1;
+}
+
--
error compiling committee.c: too many arguments to function
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