KVM: x86: hyper-v: Create a separate fifo for L2 TLB flush

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To handle L2 TLB flush requests, KVM needs to use a separate fifo from
regular (L1) Hyper-V TLB flush requests: e.g. when a request to flush
something in L2 is made, the target vCPU can transition from L2 to L1,
receive a request to flush a GVA for L1 and then try to enter L2 back.
The first request needs to be processed at this point. Similarly,
requests to flush GVAs in L1 must wait until L2 exits to L1.

No functional change as KVM doesn't handle L2 TLB flush requests 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: <20221101145426.251680-18-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Vitaly Kuznetsov 2022-11-01 15:53:55 +01:00 • committed by Paolo Bonzini

parent b6c2c22fa7

commit 53ca765a04

3 changed files with 30 additions and 8 deletions

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8

arch/x86/include/asm/kvm_host.h

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11

arch/x86/kvm/hyperv.c

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19

arch/x86/kvm/hyperv.h

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