KVM: x86: hyper-v: Introduce TLB flush fifo

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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 <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20221101145426.251680-10-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 15:53:47 +01:00 • committed by Paolo Bonzini

parent adc43caa0a

commit 0823570f01

5 changed files with 92 additions and 3 deletions

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20

arch/x86/include/asm/kvm_host.h

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47

arch/x86/kvm/hyperv.c

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15

arch/x86/kvm/hyperv.h

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2

arch/x86/kvm/svm/svm.c

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arch/x86/kvm/x86.c

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