On 06/13/2010 03:27 PM, Nadav Har'El wrote:
This patch implements the VMPTRLD instruction.
static void clear_rflags_cf_zf(struct kvm_vcpu *vcpu)
{
unsigned long rflags;
@@ -3869,6 +3889,57 @@ static int handle_vmclear(struct kvm_vcp
return 1;
}
+static bool verify_vmcs12_revision(struct kvm_vcpu *vcpu, gpa_t
guest_vmcs_addr)
+{
+ bool ret;
+ struct vmcs12 *vmcs12;
+ struct page *vmcs_page = nested_get_page(vcpu, guest_vmcs_addr);
Blank line so I can catch my breath.
+ if (vmcs_page == NULL)
+ return 0;
Doesn't seem right.
+ vmcs12 = (struct vmcs12 *)kmap_atomic(vmcs_page, KM_USER0);
+ if (vmcs12->revision_id == VMCS12_REVISION)
+ ret = 1;
+ else {
+ set_rflags_to_vmx_fail_valid(vcpu);
+ ret = 0;
+ }
+ kunmap_atomic(vmcs12, KM_USER0);
+ kvm_release_page_dirty(vmcs_page);
Can release a clean page here. But what happened to those mapping helpers?
+ return ret;
+}
+
+/* Emulate the VMPTRLD instruction */
+static int handle_vmptrld(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ gpa_t guest_vmcs_addr;
+
+ if (!nested_vmx_check_permission(vcpu))
+ return 1;
+
+ if (read_guest_vmcs_gpa(vcpu,&guest_vmcs_addr)) {
+ set_rflags_to_vmx_fail_invalid(vcpu);
Need to skip_emulated_instruction() in this case.
+ return 1;
+ }
+
+ if (!verify_vmcs12_revision(vcpu, guest_vmcs_addr))
+ return 1;
Here too.
+
+ if (vmx->nested.current_vmptr != guest_vmcs_addr) {
+ vmx->nested.current_vmptr = guest_vmcs_addr;
+
+ if (nested_create_current_vmcs(vcpu)) {
+ printk(KERN_ERR "%s error could not allocate memory",
+ __func__);
In general ftrace and the ENOMEM itself are sufficient documentation
that something went wrong.
+ return -ENOMEM;
+ }
+ }
+
+ clear_rflags_cf_zf(vcpu);
+ skip_emulated_instruction(vcpu);
+ return 1;
+}
+
--
error compiling committee.c: too many arguments to function
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