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Re: [Xen-devel] [PATCH] x86: refine link time stub area related assertion
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 15 Jan 2020 16:29:00 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 15 Jan 2020 16:29:11 +0000
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On 15/01/2020 16:27, Jan Beulich wrote:
> On 15.01.2020 15:36, Andrew Cooper wrote:
>> On 15/01/2020 10:26, Jan Beulich wrote:
>>> While it has been me to introduce this, the use of | there has become
>>> (and perhaps was from the very beginning) misleading. Rather than
>>> avoiding the right side of it when linking the xen.efi intermediate file
>>> at a different base address, make the expression cope with that case,
>>> thus verifying placement on every step.
>>>
>>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> as this is simply a
>> rearranging, but...
>>
>>> --- a/xen/arch/x86/xen.lds.S
>>> +++ b/xen/arch/x86/xen.lds.S
>>> @@ -351,8 +351,8 @@ SECTIONS
>>> .comment 0 : { *(.comment) }
>>> }
>>>
>>> -ASSERT(__image_base__ > XEN_VIRT_START |
>>> - __2M_rwdata_end <= XEN_VIRT_END - NR_CPUS * PAGE_SIZE,
>>> +ASSERT(__2M_rwdata_end <= XEN_VIRT_END - XEN_VIRT_START + __XEN_VIRT_START
>>> -
>>> + NR_CPUS * PAGE_SIZE,
>> ... doesn't this want a stubs_per_page term? We don't have 4k per cpu.
> Good point - let me see if I can fix this at this same occasion.
> I guess when introducing these pages I had one per CPU initially,
> and then forgot to update the assertion here (it being too strict
> of course is better than it being too lax).
With some suitable term, feel free to up my A-by to R-by.
~Andrew
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