KVM: x86/mmu: Tear down roots before kvm_mmu_zap_all_fast returns

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To avoid saddling a vCPU thread with the work of tearing down an entire
paging structure, take a reference on each root before they become
obsolete, so that the thread initiating the fast invalidation can tear
down the paging structure and (most likely) release the last reference.
As a bonus, this teardown can happen under the MMU lock in read mode so
as not to block the progress of vCPU threads.

Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20210401233736.638171-14-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Ben Gardon 2021-04-01 16:37:36 -07:00 • committed by Paolo Bonzini

parent b7cccd397f

commit 4c6654bd16

3 changed files with 89 additions and 1 deletions

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6

arch/x86/kvm/mmu/mmu.c

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83

arch/x86/kvm/mmu/tdp_mmu.c

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1

arch/x86/kvm/mmu/tdp_mmu.h

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