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Re: [PATCH v3 7/9] xen/riscv: introduce and init SBI RFENCE extension
- To: oleksii.kurochko@xxxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 30 Jul 2024 14:17:48 +0200
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- Cc: Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 30 Jul 2024 12:17:58 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30.07.2024 13:57, oleksii.kurochko@xxxxxxxxx wrote:
> On Tue, 2024-07-30 at 11:17 +0200, Jan Beulich wrote:
>> On 30.07.2024 10:44, oleksii.kurochko@xxxxxxxxx wrote:
>>> On Mon, 2024-07-29 at 17:52 +0200, Jan Beulich wrote:
>>>> On 24.07.2024 17:31, Oleksii Kurochko wrote:
>>>>
>>>>
>>>>> +/*
>>>>> + * Send SFENCE_VMA to a set of target HARTs.
>>>>> + *
>>>>> + * @param hart_mask mask representing set of target HARTs
>>>>> + * @param start virtual address start
>>>>> + * @param size virtual address size
>>>>
>>>> Are these really virtual addresses, not somehow a bias and a
>>>> number
>>>> of bits (CPUs) or elements? From the rest of the patch I can't
>>>> deduce
>>>> what these two parameters express.
>>> According to SBI doc start is an virtual address:
>>> https://github.com/riscv-non-isa/riscv-sbi-doc/blob/master/src/ext-rfence.adoc?plain=1#L44
>>
>> Oh, so these are describing the VA range to be flushed. Okay.
>>
>>> and hart_mask is:
>>> • unsigned long hart_mask is a scalar bit-vector containing hartids
>>
>> Biased by hart_mask_base in the actual SBI call.
> What word "biased" mean here?
The meaning of e.g. bit 0 in hart_mask will, aiui, be determined by
hart_mask_base. If the latter is non-zero, the bit will not name hart 0.
Jan
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