Re: [Xen-devel] [PATCH v2] libxc: remove stale error check for domain size in xc_sr_save_x86_hvm.c

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Sep 26, 2017 at 02:02:56PM +0200, Juergen Gross wrote:
> Long ago domains to be saved were limited to 1TB size due to the
> migration stream v1 limitations which used a 32 bit value for the
> PFN and the frame type (4 bits) leaving only 28 bits for the PFN.
> 
> Migration stream V2 uses a 64 bit value for this purpose, so there
> is no need to refuse saving (or migrating) domains larger than 1 TB.
> 
> For 32 bit toolstacks there is still a size limit, as domains larger
> than about 1TB will lead to an exhausted virtual address space of the
> saving process. So keep the test for 32 bit, but don't base it on the
> page type macros. As a migration could lead to the situation where a
> 32 bit toolstack would have to handle such a large domain (in case the
> sending side is 64 bit) the same test should be added for restoring a
> domain.
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

I will leave this to Andrew.

I don't really have an opinion here.

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