KVM: x86/mmu: Add helpers to read/write TDP MMU SPTEs and document RCU

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Add helpers to read and write TDP MMU SPTEs instead of open coding
rcu_dereference() all over the place, and to provide a convenient
location to document why KVM doesn't exempt holding mmu_lock for write
from having to hold RCU (and any future changes to the rules).

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Message-Id: <20220226001546.360188-11-seanjc@google.com>
Reviewed-by: Mingwei Zhang <mizhang@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Sean Christopherson 2022-02-26 00:15:28 +00:00 • committed by Paolo Bonzini

parent a151aceca1

commit 0e587aa733

3 changed files with 22 additions and 6 deletions

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6

arch/x86/kvm/mmu/tdp_iter.c

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16

arch/x86/kvm/mmu/tdp_iter.h

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6

arch/x86/kvm/mmu/tdp_mmu.c

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