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Re: [Xen-devel] [PATCH v2] xen/arm: Correctly support WARN_ON

Hi Ian,

On 09/09/14 02:19, Ian Campbell wrote:
On Mon, 2014-09-08 at 12:24 -0700, Julien Grall wrote:
On 08/09/14 12:19, Julien Grall wrote:

OOI what is the size increase of the final (stripped) binary with this

I compared the file xen/xen and on both arm32/arm64 the binary is
smaller of about 2%.

I think this is because previously gcc wasn't merge the string when
BUG_ON was used in inline function.

BTW this series won't work correctly because of XSA-102 on ARM64 when
WARN_ON/BUG_ON/ASSERT is used in startup code.
This is because the "current" is set to a debug sanity value.

Do you plan to send the series to add support for 32-bit userspace on
64-bits kernels for Xen 4.5?

I must confess I'd forgotten about it. I'll dig it out and brush the
cobwebs off ASAP.

Thanks, I saw the series in my inbox. I will give a look today or tomorrow.

In the meantime can the test at the head of do_trap_hypervisor be
extended to DTRT with traps from EL2 (i.e. skip the rest of the

I plan to do smth like:

if ( guest_mode(regs) && ... )


Julien Grall

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