From: Paul Mackerras <paulus@ozlabs.org>
To: Nicholas Piggin <npiggin@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org, kvm-ppc@vger.kernel.org
Subject: Re: [PATCH] KVM: PPC: Book3S HV: POWER9 more doorbell fixes
Date: Sat, 14 Oct 2017 12:24:48 +1100 [thread overview]
Message-ID: <20171014012448.GD26120@fergus.ozlabs.ibm.com> (raw)
In-Reply-To: <20171010101828.5950-1-npiggin@gmail.com>
On Tue, Oct 10, 2017 at 08:18:28PM +1000, Nicholas Piggin wrote:
> - Add another case where msgsync is required.
> - Required barrier sequence for global doorbells is msgsync ; lwsync
> - POWER9 DD1 has a different barrier sequence that we don't implement,
> so remove
>
> When msgsnd is used for IPIs to other cores, msgsync must be executed by
> the target to order stores performed on the source before its msgsnd
> (provided the source executes the appropriate sync).
>
> Fixes: 1704a81ccebc ("KVM: PPC: Book3S HV: Use msgsnd for IPIs to other cores on POWER9")
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Thanks, applied to my kvm-ppc-fixes branch (minus the comment about DD1).
Paul.
prev parent reply other threads:[~2017-10-14 1:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-10 10:18 [PATCH] KVM: PPC: Book3S HV: POWER9 more doorbell fixes Nicholas Piggin
2017-10-10 12:04 ` Nicholas Piggin
2017-10-14 1:24 ` Paul Mackerras [this message]
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