From: Paolo Bonzini <pbonzini@redhat.com>
To: "Raslan, KarimAllah" <karahmed@amazon.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Cc: "rkrcmar@redhat.com" <rkrcmar@redhat.com>
Subject: Re: [PATCH] KVM: Switch 'requests' to be 64-bit (explicitly)
Date: Thu, 5 Jul 2018 14:41:25 +0200 [thread overview]
Message-ID: <a17d4761-411e-020b-4bd6-b091eec3964f@redhat.com> (raw)
In-Reply-To: <1530793361.23804.13.camel@amazon.de>
On 05/07/2018 14:22, Raslan, KarimAllah wrote:
>> They don't support atomics on double-word data.
> But they support atomics on single words. Of which there are two.
> We don't need atomic updates of the whole 64-bit quantity (a là
> cmpxchg). Do we strictly need this to be atomic accross the 64-bit?
>
> Looking at the use cases for "requests":
>
> kvm_clear_request
> kvm_test_request
> kvm_request_pending
> kvm_check_request
>
> ... and all of them would still work if the atomicity is only at the
> word level, right?
>
Good point! Then yes, requests can be made 64 bit wide.
Paolo
next prev parent reply other threads:[~2018-07-05 12:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-14 22:26 KarimAllah Ahmed
2018-04-15 13:12 ` Raslan, KarimAllah
2018-04-16 16:26 ` Jim Mattson
2018-04-16 16:28 ` Paolo Bonzini
2018-05-22 15:42 ` Raslan, KarimAllah
2018-05-22 15:47 ` Paolo Bonzini
2018-07-05 12:22 ` Raslan, KarimAllah
2018-07-05 12:41 ` Paolo Bonzini [this message]
2018-07-05 13:51 ` Mark Rutland
2018-07-10 9:37 ` Raslan, KarimAllah
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