KVM: X86: Force ASYNC_PF_PER_VCPU to be power of two

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Forcing the ASYNC_PF_PER_VCPU to be power of two is much easier to be
used rather than calling roundup_pow_of_two() from time to time.  Do
this by adding a BUILD_BUG_ON() inside the hash function.

Another point is that generally async pf does not allow concurrency
over ASYNC_PF_PER_VCPU after all (see kvm_setup_async_pf()), so it
does not make much sense either to have it not a power of two or some
of the entries will definitely be wasted.

Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20200416155859.267366-1-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Peter Xu 2020-04-16 11:58:59 -04:00 • committed by Paolo Bonzini

parent c16312f4fa

commit dd03bcaad0

2 changed files with 6 additions and 4 deletions

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2

arch/x86/include/asm/kvm_host.h

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8

arch/x86/kvm/x86.c

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