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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2022-11-01 15:54:01 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-11-18 12:59:14 -0500 |
| commit | c58a318f6090efe06e6702b8882e2026f44f620e (patch) | |
| tree | 07825f8b81d108efc9d411075c00c701b03e1ee8 /arch/x86/kvm/hyperv.h | |
| parent | 3c9eb0655fc03fb5e84f1db334ebc832d9c5ac31 (diff) | |
| download | linux-c58a318f6090efe06e6702b8882e2026f44f620e.tar.gz linux-c58a318f6090efe06e6702b8882e2026f44f620e.tar.bz2 linux-c58a318f6090efe06e6702b8882e2026f44f620e.zip | |
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 <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20221101145426.251680-24-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/hyperv.h')
| -rw-r--r-- | arch/x86/kvm/hyperv.h | 3 |
1 files changed, 0 insertions, 3 deletions
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]; } |