From f0ace387064d45f0fd1478ff470dc8162db3b4b3 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Mon, 2 Jul 2018 13:07:14 +0200 Subject: [PATCH] x86/KVM/VMX: Add L1D flush logic Add the logic for flushing L1D on VMENTER. The flush depends on the static key being enabled and the new l1tf_flush_l1d flag being set. The flags is set: - Always, if the flush module parameter is 'always' - Conditionally at: - Entry to vcpu_run(), i.e. after executing user space - From the sched_in notifier, i.e. when switching to a vCPU thread. - From vmexit handlers which are considered unsafe, i.e. where sensitive data can be brought into L1D: - The emulator, which could be a good target for other speculative execution-based threats, - The MMU, which can bring host page tables in the L1 cache. - External interrupts - Nested operations that require the MMU (see above). That is vmptrld, vmptrst, vmclear,vmwrite,vmread. - When handling invept,invvpid [ tglx: Split out from combo patch and reduced to a single flag ] Signed-off-by: Paolo Bonzini Signed-off-by: Konrad Rzeszutek Wilk Signed-off-by: Thomas Gleixner CVE-2018-3620 CVE-2018-3646 [tyhicks: Backported around context changes] Signed-off-by: Tyler Hicks Signed-off-by: Stefan Bader --- arch/x86/include/asm/kvm_host.h | 4 ++++ arch/x86/kvm/mmu.c | 1 + arch/x86/kvm/vmx.c | 23 ++++++++++++++++++++++- arch/x86/kvm/x86.c | 8 ++++++++ 4 files changed, 35 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 5d0098c66d68..41f60f753c43 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -706,6 +706,9 @@ struct kvm_vcpu_arch { /* be preempted when it's in kernel-mode(cpl=0) */ bool preempted_in_kernel; + + /* Flush the L1 Data cache for L1TF mitigation on VMENTER */ + bool l1tf_flush_l1d; }; struct kvm_lpage_info { @@ -875,6 +878,7 @@ struct kvm_vcpu_stat { u64 signal_exits; u64 irq_window_exits; u64 nmi_window_exits; + u64 l1d_flush; u64 halt_exits; u64 halt_successful_poll; u64 halt_attempted_poll; diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index d7a63b6afbd0..666e988b5c69 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -3836,6 +3836,7 @@ int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code, { int r = 1; + vcpu->arch.l1tf_flush_l1d = true; switch (vcpu->arch.apf.host_apf_reason) { default: trace_kvm_page_fault(fault_address, error_code); diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 380867ffae38..2bd8c0c944f4 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -9045,9 +9045,20 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu) #define L1D_CACHE_ORDER 4 static void *vmx_l1d_flush_pages; -static void __maybe_unused vmx_l1d_flush(void) +static void vmx_l1d_flush(struct kvm_vcpu *vcpu) { int size = PAGE_SIZE << L1D_CACHE_ORDER; + bool always; + + /* + * If the mitigation mode is 'flush always', keep the flush bit + * set, otherwise clear it. It gets set again either from + * vcpu_run() or from one of the unsafe VMEXIT handlers. + */ + always = vmentry_l1d_flush == VMENTER_L1D_FLUSH_ALWAYS; + vcpu->arch.l1tf_flush_l1d = always; + + vcpu->stat.l1d_flush++; if (static_cpu_has(X86_FEATURE_FLUSH_L1D)) { wrmsrl(MSR_IA32_FLUSH_CMD, L1D_FLUSH); @@ -9318,6 +9329,7 @@ static void vmx_handle_external_intr(struct kvm_vcpu *vcpu) [ss]"i"(__KERNEL_DS), [cs]"i"(__KERNEL_CS) ); + vcpu->arch.l1tf_flush_l1d = true; } } STACK_FRAME_NON_STANDARD(vmx_handle_external_intr); @@ -9572,6 +9584,12 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) x86_spec_ctrl_set_guest(vmx->spec_ctrl, 0); vmx->__launched = vmx->loaded_vmcs->launched; + + if (static_branch_unlikely(&vmx_l1d_should_flush)) { + if (vcpu->arch.l1tf_flush_l1d) + vmx_l1d_flush(vcpu); + } + asm( /* Store host registers */ "push %%" _ASM_DX "; push %%" _ASM_BP ";" @@ -11293,6 +11311,9 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) if (ret) return ret; + /* Hide L1D cache contents from the nested guest. */ + vmx->vcpu.arch.l1tf_flush_l1d = true; + if (vmcs12->guest_activity_state == GUEST_ACTIVITY_HLT) return kvm_vcpu_halt(vcpu); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index c3d883e0c332..97dae55bb245 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -184,6 +184,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = { { "irq_injections", VCPU_STAT(irq_injections) }, { "nmi_injections", VCPU_STAT(nmi_injections) }, { "req_event", VCPU_STAT(req_event) }, + { "l1d_flush", VCPU_STAT(l1d_flush) }, { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) }, { "mmu_pte_write", VM_STAT(mmu_pte_write) }, { "mmu_pte_updated", VM_STAT(mmu_pte_updated) }, @@ -4552,6 +4553,9 @@ int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt, void *data = val; int r = X86EMUL_CONTINUE; + /* kvm_write_guest_virt_system can pull in tons of pages. */ + vcpu->arch.l1tf_flush_l1d = true; + while (bytes) { gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, PFERR_WRITE_MASK, @@ -5693,6 +5697,8 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, bool writeback = true; bool write_fault_to_spt = vcpu->arch.write_fault_to_shadow_pgtable; + vcpu->arch.l1tf_flush_l1d = true; + /* * Clear write_fault_to_shadow_pgtable here to ensure it is * never reused. @@ -7144,6 +7150,7 @@ static int vcpu_run(struct kvm_vcpu *vcpu) struct kvm *kvm = vcpu->kvm; vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); + vcpu->arch.l1tf_flush_l1d = true; for (;;) { if (kvm_vcpu_running(vcpu)) { @@ -8157,6 +8164,7 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) { + vcpu->arch.l1tf_flush_l1d = true; kvm_x86_ops->sched_in(vcpu, cpu); } -- 2.39.2