diff options
| author | Peter Xu <peterx@redhat.com> | 2020-04-16 11:58:59 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-05-15 12:26:13 -0400 |
| commit | dd03bcaad0b1a62c8ea6297e6f2a5993c1c5cd30 (patch) | |
| tree | 58a3a8e50c197261712183bccff0da1c6623303f /arch/x86/include/asm | |
| parent | c16312f4fa75e786f5748a7b721a05e6b0d761fe (diff) | |
KVM: X86: Force ASYNC_PF_PER_VCPU to be power of two
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>
Diffstat (limited to 'arch/x86/include/asm')
| -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 b8d035694b87..04f44961858b 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -763,7 +763,7 @@ struct kvm_vcpu_arch { struct { bool halted; - gfn_t gfns[roundup_pow_of_two(ASYNC_PF_PER_VCPU)]; + gfn_t gfns[ASYNC_PF_PER_VCPU]; struct gfn_to_hva_cache data; u64 msr_val; u32 id; |