From: Julien Grall <julien.grall@linaro.org>
To: Ian Campbell <ian.campbell@citrix.com>, xen-devel@lists.xen.org
Cc: tim@xen.org, stefano.stabellini@eu.citrix.com
Subject: Re: [PATCH v5 8/8] xen: arm: allocate more than one bank for 1:1 domain 0 if needed
Date: Wed, 09 Jul 2014 17:40:39 +0100 [thread overview]
Message-ID: <53BD7087.2030800@linaro.org> (raw)
In-Reply-To: <1404907666-8594-8-git-send-email-ian.campbell@citrix.com>
Hi Ian,
On 07/09/2014 01:07 PM, Ian Campbell wrote:
> Depending on where Xen and the initial modules were loaded into RAM we may not
> be able to allocate a suitably contiguous block of memory for dom0. Especially
> since the allocations made by alloc_domheap_pages are naturally aligned (e.g. a
> 1GB allocation must be at a 1GB boundary).
>
> The alignment requirement in particular is a huge limitation, meaning that even
> dom0_mem0=1G on a 2GB system is pretty likely to fail unless you are very
> careful with your load addresses. People were also having trouble with dom0 >
> 128MB on the 1GB cubieboard2 when using fairly standard load addresses for
> things.
>
> This patch tries to allocate multiple banks of memory in order to try and
> satisfy the entire requested domain 0 allocation. Sadly this turns out to be
> pretty tricky to arrange (see the large comment in the code).
>
> Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>
Regards,
--
Julien Grall
next prev parent reply other threads:[~2014-07-09 16:40 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-09 12:06 [PATCH v5 0/8] xen: arm: Use super pages in p2m Ian Campbell
2014-07-09 12:07 ` [PATCH v5 1/8] xen: arm: dump vcpu gic info in arch_dump_vcpu_info Ian Campbell
2014-07-09 12:07 ` [PATCH v5 2/8] tools/libxc: pull min/max_t into xc_private.h Ian Campbell
2014-07-10 11:01 ` Ian Jackson
2014-07-10 11:08 ` Ian Campbell
2014-07-09 12:07 ` [PATCH v5 3/8] tools: arm: allocate large pages to guests Ian Campbell
2014-07-09 15:19 ` Ian Jackson
2014-07-09 12:07 ` [PATCH v5 4/8] xen: arm: only put_page for p2m operations which require it Ian Campbell
2014-07-09 12:07 ` [PATCH v5 5/8] xen: arm: handle superpage mappings in p2m_lookup Ian Campbell
2014-07-09 12:07 ` [PATCH v5 6/8] xen: arm: add some helpers for assessing p2m pte Ian Campbell
2014-07-09 12:07 ` [PATCH v5 7/8] xen: arm: use superpages in p2m when pages are suitably aligned Ian Campbell
2014-07-09 16:28 ` Julien Grall
2014-07-09 17:11 ` Ian Campbell
2014-07-10 10:36 ` Julien Grall
2014-07-10 11:17 ` Ian Campbell
2014-07-10 12:44 ` Julien Grall
2014-07-10 15:22 ` Ian Campbell
2014-07-09 12:07 ` [PATCH v5 8/8] xen: arm: allocate more than one bank for 1:1 domain 0 if needed Ian Campbell
2014-07-09 16:40 ` Julien Grall [this message]
2014-07-10 10:32 ` [PATCH v5 0/8] xen: arm: Use super pages in p2m Ian Campbell
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