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KVM, x86/mmu: Fix the comment around kvm_tdp_mmu_zap_leafs()

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Now kvm_tdp_mmu_zap_leafs() only zaps leaf SPTEs but not any non-root
pages within that GFN range anymore, so the comment around it isn't
right.

Fix it by shifting the comment from tdp_mmu_zap_leafs() instead of
duplicating it, as tdp_mmu_zap_leafs() is static and is only called by
kvm_tdp_mmu_zap_leafs().

Opportunistically tweak the blurb about SPTEs being cleared to (a) say
"zapped" instead of "cleared" because "cleared" will be wrong if/when
KVM allows a non-zero value for non-present SPTE (i.e. for Intel TDX),
and (b) to clarify that a flush is needed if and only if a SPTE has been
zapped since MMU lock was last acquired.

Fixes: f47e5bbbc9 ("KVM: x86/mmu: Zap only TDP MMU leafs in zap range and mmu_notifier unmap")
Suggested-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Kai Huang <kai.huang@intel.com>
Message-Id: <20220728030452.484261-1-kai.huang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Kai Huang 2022-07-28 15:04:52 +12:00 • committed by Paolo Bonzini
parent 6fac42f127
commit 7edc3a6803
1 changed files with 3 additions and 7 deletions
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10
arch/x86/kvm/mmu/tdp_mmu.c
View file

@ -924,9 +924,6 @@ bool kvm_tdp_mmu_zap_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
}
/*
* Zap leafs SPTEs for the range of gfns, [start, end). Returns true if SPTEs
* have been cleared and a TLB flush is needed before releasing the MMU lock.
*
* If can_yield is true, will release the MMU lock and reschedule if the
* scheduler needs the CPU or there is contention on the MMU lock. If this
* function cannot yield, it will not release the MMU lock or reschedule and
@ -969,10 +966,9 @@ static bool tdp_mmu_zap_leafs(struct kvm *kvm, struct kvm_mmu_page *root,
}
/*
* Tears down the mappings for the range of gfns, [start, end), and frees the
* non-root pages mapping GFNs strictly within that range. Returns true if
* SPTEs have been cleared and a TLB flush is needed before releasing the
* MMU lock.
* Zap leaf SPTEs for the range of gfns, [start, end), for all roots. Returns
* true if a TLB flush is needed before releasing the MMU lock, i.e. if one or
* more SPTEs were zapped since the MMU lock was last acquired.
*/
bool kvm_tdp_mmu_zap_leafs(struct kvm *kvm, int as_id, gfn_t start, gfn_t end,
bool can_yield, bool flush)