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| author |   Sean Christopherson <seanjc@google.com> | 2022-02-25 18:22:45 +0000 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2022-03-01 08:58:25 -0500 |
| commit | 527d5cd7eece9f9f5e9c5b6692cd6814a46df6fe (patch) | |
| tree | b61e88761f379f2842fed1fd46a83538c05b7381 /arch/x86/kvm/mmu.h | |
| parent | KVM: Drop kvm_reload_remote_mmus(), open code request in x86 users (diff) | |
| download | linux-dev-527d5cd7eece9f9f5e9c5b6692cd6814a46df6fe.tar.xz linux-dev-527d5cd7eece9f9f5e9c5b6692cd6814a46df6fe.zip | |
KVM: x86/mmu: Zap only obsolete roots if a root shadow page is zapped
Zap only obsolete roots when responding to zapping a single root shadow
page. Because KVM keeps root_count elevated when stuffing a previous
root into its PGD cache, shadowing a 64-bit guest means that zapping any
root causes all vCPUs to reload all roots, even if their current root is
not affected by the zap.
For many kernels, zapping a single root is a frequent operation, e.g. in
Linux it happens whenever an mm is dropped, e.g. process exits, etc...
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Message-Id: <20220225182248.3812651-5-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu.h')
| -rw-r--r-- | arch/x86/kvm/mmu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h index 1d0c1904d69a..bf8dbc4bb12a 100644 --- a/arch/x86/kvm/mmu.h +++ b/arch/x86/kvm/mmu.h @@ -80,6 +80,7 @@ int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code, int kvm_mmu_load(struct kvm_vcpu *vcpu); void kvm_mmu_unload(struct kvm_vcpu *vcpu); +void kvm_mmu_free_obsolete_roots(struct kvm_vcpu *vcpu); void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu); void kvm_mmu_sync_prev_roots(struct kvm_vcpu *vcpu); |