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Re: [PATCH] xen: make VMAP support in MMU system only
- To: Jan Beulich <jbeulich@xxxxxxxx>, Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
- From: Ayan Kumar Halder <ayankuma@xxxxxxx>
- Date: Thu, 29 Aug 2024 13:25:07 +0100
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- Cc: Penny Zheng <penny.zheng@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Chen <wei.chen@xxxxxxx>, Julien Grall <julien@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 29 Aug 2024 12:25:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Jan,
On 29/08/2024 08:54, Jan Beulich wrote:
On 22.08.2024 12:52, Ayan Kumar Halder wrote:
I will update the commit message as below. Let me know if this makes
sense.
Certainly better. One more question though:
```
xen: make VMAP support in MMU system only
Introduce CONFIG_HAS_VMAP which is selected by the architectures that
use MMU. vm_init() does not do anything if CONFIG_HAS_VMAP is not
enabled.
HAS_VMAP is widely used in ALTERNATIVE feature to remap a range of
memory with new memory attributes. Since this is highly dependent on
virtual address translation, we choose to fold HAS_VMAP in MMU. And
ALTERNATIVE depends on HAS_VMAP.
What is "fold HAS_VMAP in MMU"? I see no folding anywhere. My only guess
is that this means to describe the "select HAS_VMAP" being added to MMU.
But then why the word "fold"?
Sorry, I used the incorrect word. Rather I should say
"... we choose to make HAS_VMAP selected by MMU. And ALTERNATIVE depends
..."
- Ayan
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