Re: [Xen-devel] [PATCH v3] x86/stackframe/32: repair 32-bit Xen PV

[Ingo Molnar <mingo@xxxxxxxxxx>]

* Jan Beulich <jbeulich@xxxxxxxx> wrote:

> Once again RPL checks have been introduced which don't account for a
> 32-bit kernel living in ring 1 when running in a PV Xen domain. The
> case in FIXUP_FRAME has been preventing boot. Adjust BUG_IF_WRONG_CR3
> as well to guard against future uses of the macro on a code path
> reachable when running in PV mode under Xen; I have to admit that I
> stopped at a certain point trying to figure out whether there are
> present ones.
> 
> Fixes: 3c88c692c287 ("x86/stackframe/32: Provide consistent pt_regs")
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> ---
> v3: Move USER_SEGMENT_RPL_MASK definition to segment.h. Further explain
>     the BUG_IF_WRONG_CR3 adjustment.
> v2: Avoid #ifdef and alter comment along the lines of Andy's suggestion.

Since the breakage was introduced in v5.3, I've added a Cc: stable line.

Thanks,

        Ingo

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel