This patch implements the VMCLEAR instruction.
Signed-off-by: Nadav Har'El <nyh@xxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 63 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 62 insertions(+), 1 deletion(-)
--- .before/arch/x86/kvm/vmx.c 2011-01-26 18:06:04.000000000 +0200
+++ .after/arch/x86/kvm/vmx.c 2011-01-26 18:06:04.000000000 +0200
@@ -283,6 +283,8 @@ struct __packed vmcs12 {
u32 abort;
struct vmcs_fields fields;
+
+ bool launch_state; /* set to 0 by VMCLEAR, to 1 by VMLAUNCH */
};
/*
@@ -4582,6 +4584,65 @@ static void nested_vmx_failValid(struct
get_vmcs12_fields(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 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);
+ 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);
+ 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;
+}
+
/*
* 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
@@ -4603,7 +4664,7 @@ static int (*kvm_vmx_exit_handlers[])(st
[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,
--
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