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Re: [PATCH v7 1/5] xen/riscv: add VM space layout
- To: Oleksii <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 19 May 2023 10:28:36 +0200
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- Cc: Julien Grall <julien@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Gianluca Guida <gianluca@xxxxxxxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 19 May 2023 08:28:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17.05.2023 17:56, Oleksii wrote:
> On Tue, 2023-05-16 at 17:42 +0200, Jan Beulich wrote:
>> On 11.05.2023 19:09, Oleksii Kurochko wrote:
>>> ===================================================================
>>> =========
>>> + * Start addr | End addr | Size | Slot
>>> |area description
>>> + *
>>> ===================================================================
>>> =========
>>> + * FFFFFFFFC0800000 | FFFFFFFFFFFFFFFF |1016 MB | L2 511 |
>>> Unused
>>> + * FFFFFFFFC0600000 | FFFFFFFFC0800000 | 2 MB | L2 511 |
>>> Fixmap
>>> + * FFFFFFFFC0200000 | FFFFFFFFC0600000 | 4 MB | L2 511 |
>>> FDT
>>> + * FFFFFFFFC0000000 | FFFFFFFFC0200000 | 2 MB | L2 511 |
>>> Xen
>>> + * ... | 1 GB | L2 510 |
>>> Unused
>>> + * 0000003200000000 | 0000007f40000000 | 309 GB | L2 200-509 |
>>> Direct map
>>
>> The upper bound here is 0000007f80000000 afaict,
> It should be 0000007f80000000. 0000007f40000000 is start address of 509
> slot.
>
>> which then also makes
>> the earlier gap 1Gb in size.
> do you mean that it is better to write start and end address (
> 0000007f80000000 - 7FC0000000 ) of L2 510 slot explicitly?
No, not really. The ... there is quite okay imo, because of the differing
upper bits. I was merely pointing out that as you had it the gap was 2Gb
(from 0000007f40000000 till FFFFFFFFC0000000, leaving aside the ignored
upper bits).
Jan
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