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Re: [PATCH v2 1/4] xen/io: provide helpers for multi size MMIO accesses
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 17 Apr 2025 09:43:09 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 17 Apr 2025 07:43:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.04.2025 17:32, Roger Pau Monne wrote:
> @@ -5115,7 +5115,6 @@ static void subpage_mmio_write_emulate(
>
> if ( test_bit(offset / MMIO_RO_SUBPAGE_GRAN, entry->ro_elems) )
> {
> - write_ignored:
> gprintk(XENLOG_WARNING,
> "ignoring write to R/O MMIO 0x%"PRI_mfn"%03x len %u\n",
> mfn_x(mfn), offset, len);
> @@ -5131,26 +5130,7 @@ static void subpage_mmio_write_emulate(
> return;
> }
>
> - addr += offset;
> - switch ( len )
> - {
> - case 1:
> - writeb(*(const uint8_t*)data, addr);
> - break;
> - case 2:
> - writew(*(const uint16_t*)data, addr);
> - break;
> - case 4:
> - writel(*(const uint32_t*)data, addr);
> - break;
> - case 8:
> - writeq(*(const uint64_t*)data, addr);
> - break;
> - default:
> - /* mmio_ro_emulated_write() already validated the size */
> - ASSERT_UNREACHABLE();
> - goto write_ignored;
> - }
> + write_mmio(addr + offset, data, len);
> }
Should probably have noticed this on v1 already: The log message is now lost
for the write-ignored case. It looks easy enough to have the function return
a boolean indicating "done", to retain original behavior here.
Jan
|
