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author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-02 10:41:00 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-02 10:41:00 -0700 |
commit | 628e04dfeb4f66635c0d22cf1ad0cf427406e129 (patch) | |
tree | e6e84cbaf7c88fde2445116aae044d5ca912fb1c | |
parent | ac3a0c8472969a03c0496ae774b3a29eb26c8d5a (diff) | |
parent | 830f01b089b12bbe93bd55f2d62837253012a30e (diff) | |
download | linux-628e04dfeb4f66635c0d22cf1ad0cf427406e129.tar.bz2 |
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM fixes from Paolo Bonzini:
"Bugfixes and strengthening the validity checks on inputs from new
userspace APIs.
Now I know why I shouldn't prepare pull requests on the weekend, it's
hard to concentrate if your son is shouting about his latest Minecraft
builds in your ear. Fortunately all the patches were ready and I just
had to check the test results..."
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: SVM: Fix disable pause loop exit/pause filtering capability on SVM
KVM: LAPIC: Prevent setting the tscdeadline timer if the lapic is hw disabled
KVM: arm64: Don't inherit exec permission across page-table levels
KVM: arm64: Prevent vcpu_has_ptrauth from generating OOL functions
KVM: nVMX: check for invalid hdr.vmx.flags
KVM: nVMX: check for required but missing VMCS12 in KVM_SET_NESTED_STATE
selftests: kvm: do not set guest mode flag
-rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 11 | ||||
-rw-r--r-- | arch/arm64/kvm/mmu.c | 11 | ||||
-rw-r--r-- | arch/x86/kvm/lapic.c | 2 | ||||
-rw-r--r-- | arch/x86/kvm/svm/svm.c | 9 | ||||
-rw-r--r-- | arch/x86/kvm/vmx/nested.c | 16 | ||||
-rw-r--r-- | arch/x86/kvm/vmx/nested.h | 5 | ||||
-rw-r--r-- | tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c | 42 |
7 files changed, 72 insertions, 24 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index c3e6fcc664b1..e21d4a01372f 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -380,9 +380,14 @@ struct kvm_vcpu_arch { #define vcpu_has_sve(vcpu) (system_supports_sve() && \ ((vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_SVE)) -#define vcpu_has_ptrauth(vcpu) ((system_supports_address_auth() || \ - system_supports_generic_auth()) && \ - ((vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_PTRAUTH)) +#ifdef CONFIG_ARM64_PTR_AUTH +#define vcpu_has_ptrauth(vcpu) \ + ((cpus_have_final_cap(ARM64_HAS_ADDRESS_AUTH) || \ + cpus_have_final_cap(ARM64_HAS_GENERIC_AUTH)) && \ + (vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_PTRAUTH) +#else +#define vcpu_has_ptrauth(vcpu) false +#endif #define vcpu_gp_regs(v) (&(v)->arch.ctxt.gp_regs) diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 8c0035cab6b6..31058e6e7c2a 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1326,7 +1326,7 @@ static bool stage2_get_leaf_entry(struct kvm *kvm, phys_addr_t addr, return true; } -static bool stage2_is_exec(struct kvm *kvm, phys_addr_t addr) +static bool stage2_is_exec(struct kvm *kvm, phys_addr_t addr, unsigned long sz) { pud_t *pudp; pmd_t *pmdp; @@ -1338,11 +1338,11 @@ static bool stage2_is_exec(struct kvm *kvm, phys_addr_t addr) return false; if (pudp) - return kvm_s2pud_exec(pudp); + return sz <= PUD_SIZE && kvm_s2pud_exec(pudp); else if (pmdp) - return kvm_s2pmd_exec(pmdp); + return sz <= PMD_SIZE && kvm_s2pmd_exec(pmdp); else - return kvm_s2pte_exec(ptep); + return sz == PAGE_SIZE && kvm_s2pte_exec(ptep); } static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, @@ -1958,7 +1958,8 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, * execute permissions, and we preserve whatever we have. */ needs_exec = exec_fault || - (fault_status == FSC_PERM && stage2_is_exec(kvm, fault_ipa)); + (fault_status == FSC_PERM && + stage2_is_exec(kvm, fault_ipa, vma_pagesize)); if (vma_pagesize == PUD_SIZE) { pud_t new_pud = kvm_pfn_pud(pfn, mem_type); diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 5bf72fc86a8e..4ce2ddd26c0b 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -2195,7 +2195,7 @@ void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data) { struct kvm_lapic *apic = vcpu->arch.apic; - if (!lapic_in_kernel(vcpu) || apic_lvtt_oneshot(apic) || + if (!kvm_apic_present(vcpu) || apic_lvtt_oneshot(apic) || apic_lvtt_period(apic)) return; diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index c0da4dd78ac5..5bbf76189afa 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -1090,7 +1090,7 @@ static void init_vmcb(struct vcpu_svm *svm) svm->nested.vmcb = 0; svm->vcpu.arch.hflags = 0; - if (pause_filter_count) { + if (!kvm_pause_in_guest(svm->vcpu.kvm)) { control->pause_filter_count = pause_filter_count; if (pause_filter_thresh) control->pause_filter_thresh = pause_filter_thresh; @@ -2693,7 +2693,7 @@ static int pause_interception(struct vcpu_svm *svm) struct kvm_vcpu *vcpu = &svm->vcpu; bool in_kernel = (svm_get_cpl(vcpu) == 0); - if (pause_filter_thresh) + if (!kvm_pause_in_guest(vcpu->kvm)) grow_ple_window(vcpu); kvm_vcpu_on_spin(vcpu, in_kernel); @@ -3780,7 +3780,7 @@ static void svm_handle_exit_irqoff(struct kvm_vcpu *vcpu) static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu) { - if (pause_filter_thresh) + if (!kvm_pause_in_guest(vcpu->kvm)) shrink_ple_window(vcpu); } @@ -3958,6 +3958,9 @@ static void svm_vm_destroy(struct kvm *kvm) static int svm_vm_init(struct kvm *kvm) { + if (!pause_filter_count || !pause_filter_thresh) + kvm->arch.pause_in_guest = true; + if (avic) { int ret = avic_vm_init(kvm); if (ret) diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index d4a4cec034d0..11e4df560018 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -6079,6 +6079,9 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu, ~(KVM_STATE_NESTED_SMM_GUEST_MODE | KVM_STATE_NESTED_SMM_VMXON)) return -EINVAL; + if (kvm_state->hdr.vmx.flags & ~KVM_STATE_VMX_PREEMPTION_TIMER_DEADLINE) + return -EINVAL; + /* * SMM temporarily disables VMX, so we cannot be in guest mode, * nor can VMLAUNCH/VMRESUME be pending. Outside SMM, SMM flags @@ -6108,9 +6111,16 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu, if (ret) return ret; - /* Empty 'VMXON' state is permitted */ - if (kvm_state->size < sizeof(*kvm_state) + sizeof(*vmcs12)) - return 0; + /* Empty 'VMXON' state is permitted if no VMCS loaded */ + if (kvm_state->size < sizeof(*kvm_state) + sizeof(*vmcs12)) { + /* See vmx_has_valid_vmcs12. */ + if ((kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE) || + (kvm_state->flags & KVM_STATE_NESTED_EVMCS) || + (kvm_state->hdr.vmx.vmcs12_pa != -1ull)) + return -EINVAL; + else + return 0; + } if (kvm_state->hdr.vmx.vmcs12_pa != -1ull) { if (kvm_state->hdr.vmx.vmcs12_pa == kvm_state->hdr.vmx.vmxon_pa || diff --git a/arch/x86/kvm/vmx/nested.h b/arch/x86/kvm/vmx/nested.h index 758bccc26cf9..197148d76b8f 100644 --- a/arch/x86/kvm/vmx/nested.h +++ b/arch/x86/kvm/vmx/nested.h @@ -47,6 +47,11 @@ static inline struct vmcs12 *get_shadow_vmcs12(struct kvm_vcpu *vcpu) return to_vmx(vcpu)->nested.cached_shadow_vmcs12; } +/* + * Note: the same condition is checked against the state provided by userspace + * in vmx_set_nested_state; if it is satisfied, the nested state must include + * the VMCS12. + */ static inline int vmx_has_valid_vmcs12(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); diff --git a/tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c b/tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c index 54cdefdfb49d..d59f3eb67c8f 100644 --- a/tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c +++ b/tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c @@ -76,10 +76,8 @@ void set_default_state(struct kvm_nested_state *state) void set_default_vmx_state(struct kvm_nested_state *state, int size) { memset(state, 0, size); - state->flags = KVM_STATE_NESTED_GUEST_MODE | - KVM_STATE_NESTED_RUN_PENDING; if (have_evmcs) - state->flags |= KVM_STATE_NESTED_EVMCS; + state->flags = KVM_STATE_NESTED_EVMCS; state->format = 0; state->size = size; state->hdr.vmx.vmxon_pa = 0x1000; @@ -148,6 +146,11 @@ void test_vmx_nested_state(struct kvm_vm *vm) state->hdr.vmx.smm.flags = 1; test_nested_state_expect_einval(vm, state); + /* Invalid flags are rejected. */ + set_default_vmx_state(state, state_sz); + state->hdr.vmx.flags = ~0; + test_nested_state_expect_einval(vm, state); + /* It is invalid to have vmxon_pa == -1ull and vmcs_pa != -1ull. */ set_default_vmx_state(state, state_sz); state->hdr.vmx.vmxon_pa = -1ull; @@ -185,20 +188,41 @@ void test_vmx_nested_state(struct kvm_vm *vm) state->hdr.vmx.smm.flags = KVM_STATE_NESTED_SMM_GUEST_MODE; test_nested_state_expect_einval(vm, state); - /* Size must be large enough to fit kvm_nested_state and vmcs12. */ + /* + * Size must be large enough to fit kvm_nested_state and vmcs12 + * if VMCS12 physical address is set + */ set_default_vmx_state(state, state_sz); state->size = sizeof(*state); + state->flags = 0; + test_nested_state_expect_einval(vm, state); + + set_default_vmx_state(state, state_sz); + state->size = sizeof(*state); + state->flags = 0; + state->hdr.vmx.vmcs12_pa = -1; test_nested_state(vm, state); - /* vmxon_pa cannot be the same address as vmcs_pa. */ + /* + * KVM_SET_NESTED_STATE succeeds with invalid VMCS + * contents but L2 not running. + */ set_default_vmx_state(state, state_sz); - state->hdr.vmx.vmxon_pa = 0; - state->hdr.vmx.vmcs12_pa = 0; + state->flags = 0; + test_nested_state(vm, state); + + /* Invalid flags are rejected, even if no VMCS loaded. */ + set_default_vmx_state(state, state_sz); + state->size = sizeof(*state); + state->flags = 0; + state->hdr.vmx.vmcs12_pa = -1; + state->hdr.vmx.flags = ~0; test_nested_state_expect_einval(vm, state); - /* The revision id for vmcs12 must be VMCS12_REVISION. */ + /* vmxon_pa cannot be the same address as vmcs_pa. */ set_default_vmx_state(state, state_sz); - set_revision_id_for_vmcs12(state, 0); + state->hdr.vmx.vmxon_pa = 0; + state->hdr.vmx.vmcs12_pa = 0; test_nested_state_expect_einval(vm, state); /* |