KVM: x86: Use rw_semaphore for APICv lock to allow vCPU parallelism

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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>

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Sean Christopherson 2021-10-21 17:49:27 -07:00 • committed by Paolo Bonzini

parent ee49a89329

commit 187c8833de

3 changed files with 10 additions and 8 deletions

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2

arch/x86/include/asm/kvm_host.h

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arch/x86/kvm/hyperv.c

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arch/x86/kvm/x86.c

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