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however, this is not used by L1 VM's, so filter out this similar to how VMFUNC is treated. Advertise SECONDARY_EXEC_MODE_BASED_EPT_EXEC (MBEC) to userspace, which allows userspace to expose and advertise the feature to the guest. When MBEC is enabled by userspace, configure mmu root_role has_mbec. Signed-off-by: Jon Kohler --- arch/x86/kvm/vmx/nested.c | 6 ++++++ arch/x86/kvm/vmx/vmx.c | 7 +++++++ arch/x86/kvm/vmx/vmx.h | 1 + 3 files changed, 14 insertions(+) diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index bcea087b642f..ca1f548e0703 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -474,6 +474,7 @@ static void nested_ept_new_eptp(struct kvm_vcpu *vcpu) static void nested_ept_init_mmu_context(struct kvm_vcpu *vcpu) { + struct vmcs12 *vmcs12 = get_vmcs12(vcpu); WARN_ON(mmu_is_nested(vcpu)); vcpu->arch.mmu = &vcpu->arch.guest_mmu; @@ -483,6 +484,8 @@ static void nested_ept_init_mmu_context(struct kvm_vcpu *vcpu) vcpu->arch.mmu->get_pdptr = kvm_pdptr_read; vcpu->arch.walk_mmu = &vcpu->arch.nested_mmu; + if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_MODE_BASED_EPT_EXEC)) + vcpu->arch.mmu->root_role.has_mbec = true; } static void nested_ept_uninit_mmu_context(struct kvm_vcpu *vcpu) @@ -7313,6 +7316,9 @@ static void nested_vmx_setup_secondary_ctls(u32 ept_caps, msrs->ept_caps |= VMX_EPT_AD_BIT; } + if (cpu_has_vmx_mode_based_ept_exec()) + msrs->secondary_ctls_high |= + SECONDARY_EXEC_MODE_BASED_EPT_EXEC; /* * Advertise EPTP switching irrespective of hardware support, * KVM emulates it in software so long as VMFUNC is supported. diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 520ccca27502..e23e4ffdc1b8 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -2682,6 +2682,7 @@ static int setup_vmcs_config(struct vmcs_config *vmcs_conf, return -EIO; vmx_cap->ept = 0; + _cpu_based_2nd_exec_control &= ~SECONDARY_EXEC_MODE_BASED_EPT_EXEC; _cpu_based_2nd_exec_control &= ~SECONDARY_EXEC_EPT_VIOLATION_VE; } if (!(_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_VPID) && @@ -4610,6 +4611,12 @@ static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx) */ exec_control &= ~SECONDARY_EXEC_ENABLE_VMFUNC; + /* + * KVM doesn't support mode-based EPT execute control for L1, but the + * capability is advertised to L1 guests so they can use it for L2. + */ + exec_control &= ~SECONDARY_EXEC_MODE_BASED_EPT_EXEC; + /* SECONDARY_EXEC_DESC is enabled/disabled on writes to CR4.UMIP, * in vmx_set_cr4. */ exec_control &= ~SECONDARY_EXEC_DESC; diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index bb3d96b620b1..ef45e0ca0bb8 100644 --- a/arch/x86/kvm/vmx/vmx.h +++ b/arch/x86/kvm/vmx/vmx.h @@ -584,6 +584,7 @@ static inline u8 vmx_get_rvi(void) SECONDARY_EXEC_ENABLE_VMFUNC | \ SECONDARY_EXEC_BUS_LOCK_DETECTION | \ SECONDARY_EXEC_NOTIFY_VM_EXITING | \ + SECONDARY_EXEC_MODE_BASED_EPT_EXEC | \ SECONDARY_EXEC_ENCLS_EXITING | \ SECONDARY_EXEC_EPT_VIOLATION_VE) -- 2.43.0