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x86/kvm: virt_xxx memory barriers instead of mandatory barriers

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virt_xxx memory barriers are implemented trivially using the low-level
__smp_xxx macros, __smp_xxx is equal to a compiler barrier for strong
TSO memory model, however, mandatory barriers will unconditional add
memory barriers, this patch replaces the rmb() in kvm_steal_clock() by
virt_rmb().

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Wanpeng Li 2017-04-11 02:49:21 -07:00 • committed by Radim Krčmář
commit 5a48a62271
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kernel/kvm.c
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@ -396,9 +396,9 @@ static u64 kvm_steal_clock(int cpu)
src = &per_cpu(steal_time, cpu);
do {
version = src->version;
rmb();
virt_rmb();
steal = src->steal;
rmb();
virt_rmb();
} while ((version & 1) || (version != src->version));
return steal;