diff options
| author | Ben Gardon <bgardon@google.com> | 2021-02-02 10:57:24 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-04 05:27:43 -0500 |
| commit | 531810caa9f4bc99ffbb90e09256792c56a6b07a (patch) | |
| tree | 2f8d7a33fea95476a3181b4f1aca2e1f973a4295 /virt/kvm/mmu_lock.h | |
| parent | f3d4b4b1dc1c5fb9ea17cac14133463bfe72f170 (diff) | |
KVM: x86/mmu: Use an rwlock for the x86 MMU
Add a read / write lock to be used in place of the MMU spinlock on x86.
The rwlock will enable the TDP MMU to handle page faults, and other
operations in parallel in future commits.
Reviewed-by: Peter Feiner <pfeiner@google.com>
Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20210202185734.1680553-19-bgardon@google.com>
[Introduce virt/kvm/mmu_lock.h - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm/mmu_lock.h')
| -rw-r--r-- | virt/kvm/mmu_lock.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/virt/kvm/mmu_lock.h b/virt/kvm/mmu_lock.h new file mode 100644 index 000000000000..9e1308f9734c --- /dev/null +++ b/virt/kvm/mmu_lock.h @@ -0,0 +1,23 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#ifndef KVM_MMU_LOCK_H +#define KVM_MMU_LOCK_H 1 + +/* + * Architectures can choose whether to use an rwlock or spinlock + * for the mmu_lock. These macros, for use in common code + * only, avoids using #ifdefs in places that must deal with + * multiple architectures. + */ + +#ifdef KVM_HAVE_MMU_RWLOCK +#define KVM_MMU_LOCK_INIT(kvm) rwlock_init(&(kvm)->mmu_lock) +#define KVM_MMU_LOCK(kvm) write_lock(&(kvm)->mmu_lock) +#define KVM_MMU_UNLOCK(kvm) write_unlock(&(kvm)->mmu_lock) +#else +#define KVM_MMU_LOCK_INIT(kvm) spin_lock_init(&(kvm)->mmu_lock) +#define KVM_MMU_LOCK(kvm) spin_lock(&(kvm)->mmu_lock) +#define KVM_MMU_UNLOCK(kvm) spin_unlock(&(kvm)->mmu_lock) +#endif /* KVM_HAVE_MMU_RWLOCK */ + +#endif |