linux-kernel - Re: [PATCH v2 5/5] arm64/xen: introduce CONFIG

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Message-ID: <20130603162517.GC32295@arm.com>
Date:	Mon, 3 Jun 2013 17:25:18 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Will Deacon <Will.Deacon@....com>,
	"Ian.Campbell@...rix.com" <Ian.Campbell@...rix.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>
Subject: Re: [PATCH v2 5/5] arm64/xen: introduce CONFIG_XEN and hypercall.S
 on ARM64

On Mon, Jun 03, 2013 at 04:33:44PM +0100, Stefano Stabellini wrote:
> --- /dev/null
> +++ b/arch/arm64/xen/hypercall.S
...
> +/*
> + * The Xen hypercall calling convention is very similar to the ARM AEBI
> + * procedure calling convention: the first paramter is passed in x0, the
> + * second in x1, the third in x2 and the fourth in x3. Considering that
> + * Xen hypercalls have 5 arguments at most, the fifth paramter is passed
> + * in rx, differently from the procedure calling convention of using the
> + * stack for that case.

You may want to use the AArch64 ABI here where parameters are passed in
x0-x7, return in x0.

BTW, I think it's missing a MAINTAINERS file update.

Otherwise, the series looks good. How do you plan to upstream this?

-- 
Catalin
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