From c58a318f6090efe06e6702b8882e2026f44f620e Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Tue, 1 Nov 2022 15:54:01 +0100 Subject: KVM: x86: hyper-v: L2 TLB flush Handle L2 TLB flush requests by going through all vCPUs and checking whether there are vCPUs running the same VM_ID with a VP_ID specified in the requests. Perform synthetic exit to L2 upon finish. Note, while checking VM_ID/VP_ID of running vCPUs seem to be a bit racy, we count on the fact that KVM flushes the whole L2 VPID upon transition. Also, KVM_REQ_HV_TLB_FLUSH request needs to be done upon transition between L1 and L2 to make sure all pending requests are always processed. For the reference, Hyper-V TLFS refers to the feature as "Direct Virtual Flush". Note, nVMX/nSVM code does not handle VMCALL/VMMCALL from L2 yet. Reviewed-by: Sean Christopherson Signed-off-by: Vitaly Kuznetsov Signed-off-by: Paolo Bonzini Message-Id: <20221101145426.251680-24-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/hyperv.h | 3 --- 1 file changed, 3 deletions(-) (limited to 'arch/x86/kvm/hyperv.h') diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h index 5f9c76b45f46..7706e203ff43 100644 --- a/arch/x86/kvm/hyperv.h +++ b/arch/x86/kvm/hyperv.h @@ -159,9 +159,6 @@ static inline struct kvm_vcpu_hv_tlb_flush_fifo *kvm_hv_get_tlb_flush_fifo(struc int i = is_guest_mode ? HV_L2_TLB_FLUSH_FIFO : HV_L1_TLB_FLUSH_FIFO; - /* KVM does not handle L2 TLB flush requests yet */ - WARN_ON_ONCE(i != HV_L1_TLB_FLUSH_FIFO); - return &hv_vcpu->tlb_flush_fifo[i]; } -- cgit v1.2.3