KVM: x86: hyperv: simplistic HVCALL_FLUSH_VIRTUAL_ADDRESS_{LIST,SPACE} implementation

Implement HvFlushVirtualAddress{List,Space} hypercalls in a simplistic way:
do full TLB flush with KVM_REQ_TLB_FLUSH and kick vCPUs which are currently
IN_GUEST_MODE.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

3 files changed, 82 insertions, 1 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b27de80f5870..0ebe659f2802 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -477,6 +477,7 @@ struct kvm_vcpu_hv {
         struct kvm_hyperv_exit exit;
         struct kvm_vcpu_hv_stimer stimer[HV_SYNIC_STIMER_COUNT];
         DECLARE_BITMAP(stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT);
+        cpumask_t tlb_lush;
 };
 
 struct kvm_vcpu_arch {
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index edb1ac44d628..0d916606519d 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1242,6 +1242,49 @@ int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
                 return kvm_hv_get_msr(vcpu, msr, pdata);
 }
 
+static u64 kvm_hv_flush_tlb(struct kvm_vcpu *current_vcpu, u64 ingpa,
+                            u16 rep_cnt)
+{
+        struct kvm *kvm = current_vcpu->kvm;
+        struct kvm_vcpu_hv *hv_current = &current_vcpu->arch.hyperv;
+        struct hv_tlb_flush flush;
+        struct kvm_vcpu *vcpu;
+        unsigned long vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)] = {0};
+        int i;
+
+        if (unlikely(kvm_read_guest(kvm, ingpa, &flush, sizeof(flush))))
+                return HV_STATUS_INVALID_HYPERCALL_INPUT;
+
+        trace_kvm_hv_flush_tlb(flush.processor_mask, flush.address_space,
+                               flush.flags);
+
+        cpumask_clear(&hv_current->tlb_lush);
+
+        kvm_for_each_vcpu(i, vcpu, kvm) {
+                struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
+
+                if (!(flush.flags & HV_FLUSH_ALL_PROCESSORS) &&
+                    (hv->vp_index >= 64 ||
+                    !(flush.processor_mask & BIT_ULL(hv->vp_index))))
+                        continue;
+
+                /*
+                 * vcpu->arch.cr3 may not be up-to-date for running vCPUs so we
+                 * can't analyze it here, flush TLB regardless of the specified
+                 * address space.
+                 */
+                __set_bit(i, vcpu_bitmap);
+        }
+
+        kvm_make_vcpus_request_mask(kvm,
+                                    KVM_REQ_TLB_FLUSH | KVM_REQUEST_NO_WAKEUP,
+                                    vcpu_bitmap, &hv_current->tlb_lush);
+
+        /* We always do full TLB flush, set rep_done = rep_cnt. */
+        return (u64)HV_STATUS_SUCCESS |
+                ((u64)rep_cnt << HV_HYPERCALL_REP_COMP_OFFSET);
+}
+
 bool kvm_hv_hypercall_enabled(struct kvm *kvm)
 {
         return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE;
@@ -1379,12 +1422,25 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
                 vcpu->arch.complete_userspace_io =
                                 kvm_hv_hypercall_complete_userspace;
                 return 0;
+        case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST:
+                if (unlikely(fast || !rep_cnt || rep_idx)) {
+                        ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
+                        break;
+                }
+                ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt);
+                break;
+        case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE:
+                if (unlikely(fast || rep)) {
+                        ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
+                        break;
+                }
+                ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt);
+                break;
         default:
                 ret = HV_STATUS_INVALID_HYPERCALL_CODE;
                 break;
         }
 
-set_result:
         kvm_hv_hypercall_set_result(vcpu, ret);
         return 1;
 }
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 9807c314c478..47a4fd758743 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -1367,6 +1367,30 @@ TRACE_EVENT(kvm_hv_timer_state,
                         __entry->vcpu_id,
                         __entry->hv_timer_in_use)
 );
+
+/*
+ * Tracepoint for kvm_hv_flush_tlb.
+ */
+TRACE_EVENT(kvm_hv_flush_tlb,
+        TP_PROTO(u64 processor_mask, u64 address_space, u64 flags),
+        TP_ARGS(processor_mask, address_space, flags),
+
+        TP_STRUCT__entry(
+                __field(u64, processor_mask)
+                __field(u64, address_space)
+                __field(u64, flags)
+        ),
+
+        TP_fast_assign(
+                __entry->processor_mask = processor_mask;
+                __entry->address_space = address_space;
+                __entry->flags = flags;
+        ),
+
+        TP_printk("processor_mask 0x%llx address_space 0x%llx flags 0x%llx",
+                  __entry->processor_mask, __entry->address_space,
+                  __entry->flags)
+);
 #endif /* _TRACE_KVM_H */
 
 #undef TRACE_INCLUDE_PATH