KVM: x86/mmu: Factor out tdp_iter_return_to_root

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In tdp_mmu_iter_cond_resched there is a call to tdp_iter_start which
causes the iterator to continue its walk over the paging structure from
the root. This is needed after a yield as paging structure could have
been freed in the interim.

The tdp_iter_start call is not very clear and something of a hack. It
requires exposing tdp_iter fields not used elsewhere in tdp_mmu.c and
the effect is not obvious from the function name. Factor a more aptly
named function out of tdp_iter_start and call it from
tdp_mmu_iter_cond_resched and tdp_iter_start.

No functional change intended.

Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20210315233803.2706477-4-bgardon@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Ben Gardon 2021-03-15 16:38:02 -07:00 • committed by Paolo Bonzini

parent 14f6fec2e8

commit b601c3bc9d

3 changed files with 19 additions and 10 deletions

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24

arch/x86/kvm/mmu/tdp_iter.c

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arch/x86/kvm/mmu/tdp_iter.h

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4

arch/x86/kvm/mmu/tdp_mmu.c

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