On 08/01/2013 10:08 PM, Gleb Natapov wrote:
> +/* Emulate the INVEPT instruction */
> +static int handle_invept(struct kvm_vcpu *vcpu)
> +{
> + u32 vmx_instruction_info;
> + bool ok;
> + unsigned long type;
> + gva_t gva;
> + struct x86_exception e;
> + struct {
> + u64 eptp, gpa;
> + } operand;
> +
> + if (!(nested_vmx_secondary_ctls_high & SECONDARY_EXEC_ENABLE_EPT) ||
> + !(nested_vmx_ept_caps & VMX_EPT_INVEPT_BIT)) {
> + kvm_queue_exception(vcpu, UD_VECTOR);
> + return 1;
> + }
> +
> + if (!nested_vmx_check_permission(vcpu))
> + return 1;
> +
> + if (!kvm_read_cr0_bits(vcpu, X86_CR0_PE)) {
> + kvm_queue_exception(vcpu, UD_VECTOR);
> + return 1;
> + }
> +
> + /* According to the Intel VMX instruction reference, the memory
> + * operand is read even if it isn't needed (e.g., for type==global)
> + */
> + vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
> + if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
> + vmx_instruction_info, &gva))
> + return 1;
> + if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &operand,
> + sizeof(operand), &e)) {
> + kvm_inject_page_fault(vcpu, &e);
> + return 1;
> + }
> +
> + type = kvm_register_read(vcpu, (vmx_instruction_info >> 28) & 0xf);
> +
> + switch (type) {
> + case VMX_EPT_EXTENT_GLOBAL:
> + case VMX_EPT_EXTENT_CONTEXT:
> + ok = !!(nested_vmx_ept_caps &
> + (1UL << (type + VMX_EPT_EXTENT_SHIFT)));
> + break;
> + default:
> + ok = false;
> + }
> +
> + if (ok) {
> + kvm_mmu_sync_roots(vcpu);
> + kvm_mmu_flush_tlb(vcpu);
> + nested_vmx_succeed(vcpu);
> + }
> + else
> + nested_vmx_failValid(vcpu,
> + VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
> +
> + skip_emulated_instruction(vcpu);
> + return 1;
Can this code be changed to:
switch (type) {
case VMX_EPT_EXTENT_GLOBAL:
case VMX_EPT_EXTENT_CONTEXT:
if (nested_vmx_ept_caps &
(1UL << (type + VMX_EPT_EXTENT_SHIFT) {
kvm_mmu_sync_roots(vcpu);
kvm_mmu_flush_tlb(vcpu);
nested_vmx_succeed(vcpu);
break;
}
default:
nested_vmx_failValid(vcpu,
VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
}
?
That's clearer i think.
Also, we can sync the shadow page table only if the current eptp is the required
eptp, that means:
if (type == GLOBAL || operand.eptp == nested_ept_get_cr3(vcpu)) {
kvm_mmu_sync_roots(vcpu);
......
}
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