From: Julien Grall <julien.grall@linaro.org>
To: Ian Campbell <Ian.Campbell@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Anup Patel <apatel@apm.com>,
Andre Przywara <andre.przywara@calxeda.com>,
Tim Deegan <tim@xen.org>,
Pranavkumar Sawargaonkar <psawargaonkar@apm.com>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: [PATCH v2] tools: libxc: flush data cache after loading images into guest memory
Date: Mon, 16 Dec 2013 00:49:30 +0000 [thread overview]
Message-ID: <52AE4E1A.6070007@linaro.org> (raw)
In-Reply-To: <1386939215.20787.87.camel@dagon.hellion.org.uk>
On 12/13/2013 12:53 PM, Ian Campbell wrote:
>>>
>>>> Unfortunately Linux doesn't provide any syscall to call this function
>>>> for ARMv7 and it's not possible to call cache instruction from
>>>> userspace. What we could do is:
>>>> - Use the "flags" parameters of cacheflush syscall and call a
>>>> function which DCCMVAC (for instance __cpuc_flush_dcache_area)
>>>> - Extend privcmd to have a flush cache ioctl
>>>
>>> Personally I think the first is nicer, but ultimately we need input from
>>> l-a-k on this one and would be happy with either.
>>
>> I agree. Can you try to come up with such a patch?
There is 2 functions in kernel space to flush cache PoC:
- flush_kern_dcache_area
- dma_flush_range
I'm not sure if one of these are suitable to expose to user space.
> I think Julien was going to investigate, but if says not I'll take a
> stab at it.
I will try to do and send a patch tomorrow.
--
Julien Grall
next prev parent reply other threads:[~2013-12-16 0:49 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-12 12:21 [PATCH] tools: libxc: flush data cache after loading images into guest memory Ian Campbell
2013-12-12 14:11 ` Julien Grall
2013-12-12 14:23 ` [PATCH v2] " Ian Campbell
2013-12-12 14:30 ` Stefano Stabellini
2013-12-12 14:37 ` Ian Campbell
2013-12-12 14:45 ` Stefano Stabellini
2013-12-12 14:49 ` Ian Campbell
2013-12-12 17:31 ` Ian Campbell
2013-12-12 17:52 ` Ian Jackson
2013-12-12 19:32 ` Ian Campbell
2013-12-12 19:43 ` Ian Jackson
2013-12-12 17:33 ` Ian Campbell
2013-12-13 0:49 ` Julien Grall
2013-12-13 8:26 ` Ian Campbell
2013-12-13 12:01 ` Stefano Stabellini
2013-12-13 12:53 ` Ian Campbell
2013-12-16 0:49 ` Julien Grall [this message]
2013-12-16 11:05 ` Ian Campbell
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