KVM: x86/mmu: Fast invalidation for TDP MMU

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Provide a real mechanism for fast invalidation by marking roots as
invalid so that their reference count will quickly fall to zero
and they will be torn down.

One negative side affect of this approach is that a vCPU thread will
likely drop the last reference to a root and be saddled with the work of
tearing down an entire paging structure. This issue will be resolved in
a later commit.

Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20210401233736.638171-13-bgardon@google.com>
[Move the loop to tdp_mmu.c, otherwise compilation fails on 32-bit. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Ben Gardon 2021-04-01 16:37:35 -07:00 • committed by Paolo Bonzini

parent 24ae4cfaaa

commit b7cccd397f

3 changed files with 31 additions and 3 deletions

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12

arch/x86/kvm/mmu/mmu.c

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17

arch/x86/kvm/mmu/tdp_mmu.c

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5

arch/x86/kvm/mmu/tdp_mmu.h

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