From: Borislav Petkov <bp@alien8.de>
To: "Zhao, Yakui" <yakui.zhao@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"Chen, Jason CJ" <jason.cj.chen@intel.com>
Subject: Re: [RFC PATCH v5 4/4] x86/acrn: Add hypercall for ACRN guest
Date: Mon, 29 Apr 2019 09:36:25 +0200 [thread overview]
Message-ID: <20190429073625.GA2324@zn.tnic> (raw)
In-Reply-To: <4c5ca6d7-ffb1-a5a5-9e46-9057802318e0@intel.com>
On Mon, Apr 29, 2019 at 09:24:12AM +0800, Zhao, Yakui wrote:
> Yes. "movq" only indicates explicitly that it is 64-bit mov as ACRN guest
> only works under 64-bit mode.
> I also check the usage of "mov" and "movq" in this scenario. There is no
> difference except that the movq is an explicit 64-op.
Damn, I'm tired of explaining this: it is explicit only to the code
reader. gcc generates the *same* instruction no matter whether it has a
"q" suffix or not as long as the destination register is a 64-bit one.
If you prefer to have it explicit, sure, use "movq".
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
next prev parent reply other threads:[~2019-04-29 7:36 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-24 0:54 [RFC PATCH v5 0/4] x86: Add the support of ACRN guest under x86 Zhao Yakui
2019-04-24 0:54 ` [RFC PATCH v5 1/4] x86/Kconfig: Add new config symbol to unify conditional definition of hv_irq_callback_count Zhao Yakui
2019-04-24 0:54 ` [RFC PATCH v5 2/4] x86: Add the support of Linux guest on ACRN hypervisor Zhao Yakui
2019-04-24 0:54 ` [RFC PATCH v5 3/4] x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN guest upcall vector Zhao Yakui
2019-04-25 7:17 ` Ingo Molnar
2019-04-25 12:42 ` Zhao, Yakui
2019-04-25 19:45 ` Ingo Molnar
2019-04-26 1:46 ` Zhao, Yakui
2019-04-26 5:57 ` Ingo Molnar
2019-04-24 0:54 ` [RFC PATCH v5 4/4] x86/acrn: Add hypercall for ACRN guest Zhao Yakui
2019-04-25 7:07 ` Ingo Molnar
2019-04-25 10:16 ` Zhao, Yakui
2019-04-25 11:00 ` Borislav Petkov
2019-04-26 3:18 ` Zhao, Yakui
2019-04-27 8:58 ` Borislav Petkov
2019-04-28 1:56 ` Zhao, Yakui
2019-04-28 10:03 ` Borislav Petkov
2019-04-29 1:24 ` Zhao, Yakui
2019-04-29 7:36 ` Borislav Petkov [this message]
2019-04-29 9:52 ` Zhao, Yakui
2019-04-24 22:20 ` [RFC PATCH v5 0/4] x86: Add the support of ACRN guest under x86 Thomas Gleixner
2019-04-25 5:44 ` Zhao, Yakui
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