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Re: [PATCH v2 5/8] xen/riscv: introduce asm/pmap.h header
- To: Julien Grall <julien@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 22 Jul 2024 14:58:29 +0200
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- Cc: Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 22 Jul 2024 12:58:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21.07.2024 10:51, Julien Grall wrote:
> On 12/07/2024 17:22, Oleksii Kurochko wrote:
>> +inline pte_t mfn_to_xen_entry(mfn_t mfn, unsigned int attr)
>> +{
>> + /* there is no attr field in RISC-V's pte */
>> + (void) attr;
>
> Surely you have a way to say indicate whether an entry is readable/writable?
I'm puzzled by this question. The sole outlier in Arm code is pmap.h, in
passing PAGE_HYPERVISOR_RW to this function when all others pass memory
types (MT_*). Afaics only the low three bits are then used in the
function, discarding access control bits altogether. R/W access appears
to be implied.
Jan
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