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Re: [PATCH v2 1/4] xen/io: provide helpers for multi size MMIO accesses
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 16 Apr 2025 10:40:32 +0200
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- Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 16 Apr 2025 08:40:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.04.2025 10:29, Andrew Cooper wrote:
> On 15/04/2025 4:32 pm, Roger Pau Monne wrote:
>> diff --git a/xen/include/xen/io.h b/xen/include/xen/io.h
>> new file mode 100644
>> index 000000000000..4495a04c403e
>> --- /dev/null
>> +++ b/xen/include/xen/io.h
>> @@ -0,0 +1,68 @@
>> +/* SPDX-License-Identifier: GPL-2.0-only */
>> +/*
>> + * IO related routines.
>> + *
>> + * Copyright (c) 2025 Cloud Software Group
>> + */
>> +#ifndef XEN_IO_H
>> +#define XEN_IO_H
>> +
>> +#include <xen/bug.h>
>> +
>> +#include <asm/io.h>
>> +
>> +static inline unsigned long read_mmio(const volatile void __iomem *mem,
>
> void *__iomem. (i.e. without the __iomem in the middle of the type).
> It seems most examples of this in Xen are wrong.
Hmm, perhaps in turn because I don't see why it would need to be that
placement. The attribute describes what's pointed to, not the variable
(or parameter here) itself.
Jan
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