linux-kernel - Re: [PATCH RFC 5/6] arm64/xen: implement xen

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Message-ID: <20130531105915.GC18045@localhost.cambridge.arm.com>
Date:	Fri, 31 May 2013 11:59:15 +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 RFC 5/6] arm64/xen: implement xen_remap on arm64

On Thu, May 30, 2013 at 05:18:32PM +0100, Stefano Stabellini wrote:
> --- a/arch/arm/include/asm/xen/page.h
> +++ b/arch/arm/include/asm/xen/page.h
> @@ -90,6 +90,10 @@ static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
>  	return __set_phys_to_machine(pfn, mfn);
>  }
>  
> +#ifdef CONFIG_ARM64
> +#define xen_remap(cookie, size) __ioremap((cookie), (size), __pgprot(PROT_NORMAL))
> +#else
>  #define xen_remap(cookie, size) __arm_ioremap((cookie), (size), MT_MEMORY);
> +#endif

Now I saw the ARM-specific part. Can you not use something like
ioremap_cached() which would give normal cacheable memory (at least on
ARMv7).

>  #endif /* _ASM_ARM_XEN_PAGE_H */
> diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
> index 2e12258..0e9c9ac 100644
> --- a/arch/arm64/include/asm/io.h
> +++ b/arch/arm64/include/asm/io.h
> @@ -228,6 +228,7 @@ extern void __iounmap(volatile void __iomem *addr);
>  #define PROT_DEFAULT		(PTE_TYPE_PAGE | PTE_AF | PTE_DIRTY)
>  #define PROT_DEVICE_nGnRE	(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_DEVICE_nGnRE))
>  #define PROT_NORMAL_NC		(PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL_NC))
> +#define PROT_NORMAL		(PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL))
>  
>  #define ioremap(addr, size)		__ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))
>  #define ioremap_nocache(addr, size)	__ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))

Of course we need to add ioremap_cached() for arm64 but until now we
didn't need it.

-- 
Catalin
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