From 0823570f01989d3703751f66534a138d4fae062e Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Tue, 1 Nov 2022 15:53:47 +0100 Subject: KVM: x86: hyper-v: Introduce TLB flush fifo To allow flushing individual GVAs instead of always flushing the whole VPID a per-vCPU structure to pass the requests is needed. Use standard 'kfifo' to queue two types of entries: individual GVA (GFN + up to 4095 following GFNs in the lower 12 bits) and 'flush all'. The size of the fifo is arbitrarily set to '16'. Note, kvm_hv_flush_tlb() only queues 'flush all' entries for now and kvm_hv_vcpu_flush_tlb() doesn't actually read the fifo just resets the queue before returning -EOPNOTSUPP (which triggers full TLB flush) so the functional change is very small but the infrastructure is prepared to handle individual GVA flush requests. Reviewed-by: Sean Christopherson Signed-off-by: Vitaly Kuznetsov Signed-off-by: Paolo Bonzini Message-Id: <20221101145426.251680-10-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/hyperv.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'arch/x86/kvm/hyperv.h') diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h index 1030b1b50552..f79edf9234cd 100644 --- a/arch/x86/kvm/hyperv.h +++ b/arch/x86/kvm/hyperv.h @@ -151,4 +151,19 @@ int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args); int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, struct kvm_cpuid_entry2 __user *entries); +static inline void kvm_hv_vcpu_purge_flush_tlb(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo; + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + + if (!hv_vcpu || !kvm_check_request(KVM_REQ_HV_TLB_FLUSH, vcpu)) + return; + + tlb_flush_fifo = &hv_vcpu->tlb_flush_fifo; + + kfifo_reset_out(&tlb_flush_fifo->entries); +} + +int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu); + #endif -- cgit v1.2.3