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Re: [PATCH v3 1/7] swiotlb: make io_tlb_default_mem local to swiotlb.c
- To: Christoph Hellwig <hch@xxxxxx>
- From: Petr Tesařík <petr@xxxxxxxxxxx>
- Date: Tue, 27 Jun 2023 19:24:14 +0200
- Authentication-results: mail.tesarici.cz; dmarc=fail (p=none dis=none) header.from=tesarici.cz
- Cc: Robin Murphy <robin.murphy@xxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Petr Tesarik <petrtesarik@xxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, "Rafael J. Wysocki" <rafael@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>, Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>, Hans de Goede <hdegoede@xxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Saravana Kannan <saravanak@xxxxxxxxxx>, "moderated list:XEN HYPERVISOR ARM" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "moderated list:ARM PORT" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, open list <linux-kernel@xxxxxxxxxxxxxxx>, "open list:MIPS" <linux-mips@xxxxxxxxxxxxxxx>, "open list:XEN SWIOTLB SUBSYSTEM" <iommu@xxxxxxxxxxxxxxx>, Roberto Sassu <roberto.sassu@xxxxxxxxxxxxxxx>, Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
- Delivery-date: Tue, 27 Jun 2023 17:24:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, 27 Jun 2023 17:48:02 +0200
Christoph Hellwig <hch@xxxxxx> wrote:
> On Tue, Jun 27, 2023 at 01:30:06PM +0200, Petr Tesařík wrote:
> > Xen is the only user of an "is SWIOTLB present" interface. IIUC Xen
> > needs bounce buffers for the PCI frontend driver, but if there is no
> > other reason to have a SWIOTLB, the system does not set up one at boot.
>
> Please take a look at my "unexport swiotlb_active v2" series that
> unfortunately missed the 6.5 merge window waiting for reviews.
I noticed it, but it seems I missed the part which completely removes
pci_xen_swiotlb_init_late().
Then we're left only with a reference from xen_mm_init() in
arch/arm/xen/mm.c, and I believe this one can also be solved
differently.
Petr T
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