linux-kernel - Re: [PATCH] x86/kvm: virt_xxx memory barriers instead of mandatory barriers

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Date:   Wed, 12 Apr 2017 21:04:33 +0200
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <wanpeng.li@...mail.com>
Subject: Re: [PATCH] x86/kvm: virt_xxx memory barriers instead of mandatory
 barriers

2017-04-11 02:49-0700, Wanpeng Li:
> From: Wanpeng Li <wanpeng.li@...mail.com>
> 
> 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@...hat.com>
> Cc: Radim Krčmář <rkrcmar@...hat.com>
> Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
> ---

Applied to kvm/queue, thanks.