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| author | Sean Christopherson <seanjc@google.com> | 2021-10-21 17:49:27 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-10-22 11:20:16 -0400 |
| commit | 187c8833def8a191c7f01d7932eac1bd2ab84af1 (patch) | |
| tree | 5a76d19edb25bbc663c4eafec41c37875625bc68 /arch/x86/include | |
| parent | ee49a89329711f84601bcb65ac8e8ef54fdac771 (diff) | |
| download | linux-187c8833def8a191c7f01d7932eac1bd2ab84af1.tar.gz | |
KVM: x86: Use rw_semaphore for APICv lock to allow vCPU parallelism
Use a rw_semaphore instead of a mutex to coordinate APICv updates so that
vCPUs responding to requests can take the lock for read and run in
parallel. Using a mutex forces serialization of vCPUs even though
kvm_vcpu_update_apicv() only touches data local to that vCPU or is
protected by a different lock, e.g. SVM's ir_list_lock.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20211022004927.1448382-5-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index d41699e89d1f..c8530ea136aa 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1071,7 +1071,7 @@ struct kvm_arch { atomic_t apic_map_dirty; /* Protects apic_access_memslot_enabled and apicv_inhibit_reasons */ - struct mutex apicv_update_lock; + struct rw_semaphore apicv_update_lock; bool apic_access_memslot_enabled; unsigned long apicv_inhibit_reasons; |