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>

1 files changed, 57 insertions, 1 deletions

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;
 }