[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PATCH for-4.15 v2] xen: Bump the minimum version of GCC supported to 4.9 for arm32 and 5.1 on arm64



Hi Ian,

On 15/03/2021 12:05, Ian Jackson wrote:
Julien Grall writes ("[PATCH for-4.15 v2] xen: Bump the minimum version of GCC 
supported to 4.9 for arm32 and 5.1 on arm64"):
From: Julien Grall <jgrall@xxxxxxxxxx>

Compilers older than 4.8 have known codegen issues which can lead to
silent miscompilation:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145

Furthermore, pre-4.9 GCC have known bugs (including things like
internal compiler errors on Arm) which would require workaround (I
haven't checked if we have any in Xen).

The minimum version of GCC to build the hypervisor on arm is now
raised to 4.9.

In addition to that, on arm64, GCC version >= 4.9 and < 5.1 have been
shown to emit memory references beyond the stack pointer, resulting in
memory corruption if an interrupt is taken after the stack pointer has
been adjusted but before the reference has been executed.

Therefore, the minimum for arm64 is raised to 5.1.

Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>

Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>

Thanks! I have committed the patch with Bertrand and Stefano's reviewed-by.

Cheers,

--
Julien Grall



 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.