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KVM: x86/mmu: Use an rwlock for the x86 MMU

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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>
This commit is contained in:
Ben Gardon
2021-02-02 10:57:24 -08:00
committed by Paolo Bonzini
parent f3d4b4b1dc
commit 531810caa9
10 changed files with 118 additions and 84 deletions
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5
include/linux/kvm_host.h
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@@ -451,7 +451,12 @@ struct kvm_memslots {
};
struct kvm {
#ifdef KVM_HAVE_MMU_RWLOCK
rwlock_t mmu_lock;
#else
spinlock_t mmu_lock;
#endif /* KVM_HAVE_MMU_RWLOCK */
struct mutex slots_lock;
struct mm_struct *mm; /* userspace tied to this vm */
struct kvm_memslots __rcu *memslots[KVM_ADDRESS_SPACE_NUM];