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| author | Sean Christopherson <seanjc@google.com> | 2021-08-10 23:52:36 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-08-20 23:06:15 +0300 |
| commit | 5a324c24b638d0f3194e1dc8f0cebd28a0745238 (patch) | |
| tree | e5c61449e9702e50b2000d620b07018970a90fed /arch/x86/kvm/mmu/tdp_mmu.h | |
| parent | 3bcd0662d66fd07e596d2a7445e6b3215631b901 (diff) | |
| download | linux-5a324c24b638d0f3194e1dc8f0cebd28a0745238.tar.xz | |
Revert "KVM: x86/mmu: Allow zap gfn range to operate under the mmu read lock"
This together with the next patch will fix a future race between
kvm_zap_gfn_range and the page fault handler, which will happen
when AVIC memslot is going to be only partially disabled.
The performance impact is minimal since kvm_zap_gfn_range is only
called by users, update_mtrr() and kvm_post_set_cr0().
Both only use it if the guest has non-coherent DMA, in order to
honor the guest's UC memtype.
MTRR and CD setup only happens at boot, and generally in an area
where the page tables should be small (for CD) or should not
include the affected GFNs at all (for MTRRs).
This is based on a patch suggested by Sean Christopherson:
https://lkml.org/lkml/2021/7/22/1025
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210810205251.424103-2-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu/tdp_mmu.h')
| -rw-r--r-- | arch/x86/kvm/mmu/tdp_mmu.h | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/arch/x86/kvm/mmu/tdp_mmu.h b/arch/x86/kvm/mmu/tdp_mmu.h index b224d126adf9..358f447d4012 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.h +++ b/arch/x86/kvm/mmu/tdp_mmu.h @@ -20,14 +20,11 @@ void kvm_tdp_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *root, bool shared); bool __kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, int as_id, gfn_t start, - gfn_t end, bool can_yield, bool flush, - bool shared); + gfn_t end, bool can_yield, bool flush); static inline bool kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, int as_id, - gfn_t start, gfn_t end, bool flush, - bool shared) + gfn_t start, gfn_t end, bool flush) { - return __kvm_tdp_mmu_zap_gfn_range(kvm, as_id, start, end, true, flush, - shared); + return __kvm_tdp_mmu_zap_gfn_range(kvm, as_id, start, end, true, flush); } static inline bool kvm_tdp_mmu_zap_sp(struct kvm *kvm, struct kvm_mmu_page *sp) { @@ -44,7 +41,7 @@ static inline bool kvm_tdp_mmu_zap_sp(struct kvm *kvm, struct kvm_mmu_page *sp) */ lockdep_assert_held_write(&kvm->mmu_lock); return __kvm_tdp_mmu_zap_gfn_range(kvm, kvm_mmu_page_as_id(sp), - sp->gfn, end, false, false, false); + sp->gfn, end, false, false); } void kvm_tdp_mmu_zap_all(struct kvm *kvm); |