From: Julien Grall <julien.grall@linaro.org>
To: Ian Campbell <ian.campbell@citrix.com>,
tim@xen.org, stefano.stabellini@eu.citrix.com,
ian.jackson@eu.citrix.com
Cc: xen-devel@lists.xen.org
Subject: Re: [PATCH v5 8/9] tools: arm: support up to (almost) 1TB of guest RAM
Date: Thu, 22 May 2014 11:25:03 +0100 [thread overview]
Message-ID: <537DD07F.5020101@linaro.org> (raw)
In-Reply-To: <1400752004-9731-8-git-send-email-ian.campbell@citrix.com>
Hi Ian,
On 22/05/14 10:46, Ian Campbell wrote:
> This creates a second bank of RAM starting at 8GB and potentially
> extending to the 1TB boundary, which is the limit imposed by our
> current use of a 3 level p2m with 2 pages at level 0 (2^40 bits).
>
> I've deliberately left a gap between the two banks just to
> exercise those code paths.
>
> The second bank is 1016GB in size which plus the 3GB below 4GB is
> 1019GB maximum guest RAM. At the point where the fact that this
> is slightly less than a full TB starts to become an issue for
> people then we can switch to a 4 level p2m, which would be needed
> to support guests larger than 1TB anyhow.
>
> Tested on 32-bit with 1, 4 and 6GB guests. Anything more than
> ~3GB requires an LPAE enabled kernel, or a 64-bit guest.
>
> Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>
--
Julien Grall
next prev parent reply other threads:[~2014-05-22 10:25 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-22 9:39 [PATCH v5 0/9] xen: arm: support up to (almost) 1TB of guest RAM Ian Campbell
2014-05-22 9:46 ` [PATCH v5 1/9] tools: libxl: use uint64_t not unsigned long long for addresses Ian Campbell
2014-05-22 9:46 ` [PATCH v5 2/9] tools: arm: report an error if the guest RAM is too large Ian Campbell
2014-07-02 15:06 ` Ian Jackson
2014-05-22 9:46 ` [PATCH v5 3/9] tools: arm: move magic pfns out of guest RAM region Ian Campbell
2014-05-22 9:46 ` [PATCH v5 4/9] tools: arm: rearrange guest physical address space to increase max RAM Ian Campbell
2014-05-22 9:46 ` [PATCH v5 5/9] tools: arm: refactor code to setup guest p2m and fill it with RAM Ian Campbell
2014-05-22 16:50 ` Ian Jackson
2014-05-22 9:46 ` [PATCH v5 6/9] tools: arm: prepare domain builder for multiple banks of guest RAM Ian Campbell
2014-05-22 10:18 ` Julien Grall
2014-05-22 16:52 ` Ian Jackson
2014-05-22 9:46 ` [PATCH v5 7/9] tools: arm: prepare guest FDT building for multiple RAM banks Ian Campbell
2014-05-22 10:22 ` Julien Grall
2014-05-22 16:55 ` Ian Jackson
2014-05-23 8:43 ` Ian Campbell
2014-05-22 9:46 ` [PATCH v5 8/9] tools: arm: support up to (almost) 1TB of guest RAM Ian Campbell
2014-05-22 10:25 ` Julien Grall [this message]
2014-05-22 16:55 ` Ian Jackson
2014-05-22 9:46 ` [PATCH v5 9/9] tools: arm: increase size of region set aside for guest grant table Ian Campbell
2014-06-02 14:42 ` [PATCH v5 0/9] xen: arm: support up to (almost) 1TB of guest RAM Ian Campbell
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