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Message-ID: <20230627154802.GA29567@lst.de>
Date: Tue, 27 Jun 2023 17:48:02 +0200
From: Christoph Hellwig <hch@....de>
To: Petr Tesařík <petr@...arici.cz>
Cc: Robin Murphy <robin.murphy@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Petr Tesarik <petrtesarik@...weicloud.com>,
Stefano Stabellini <sstabellini@...nel.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Juergen Gross <jgross@...e.com>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
Christoph Hellwig <hch@....de>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Hans de Goede <hdegoede@...hat.com>,
Jason Gunthorpe <jgg@...pe.ca>,
Kees Cook <keescook@...omium.org>,
Saravana Kannan <saravanak@...gle.com>,
"moderated list:XEN HYPERVISOR ARM" <xen-devel@...ts.xenproject.org>,
"moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
open list <linux-kernel@...r.kernel.org>,
"open list:MIPS" <linux-mips@...r.kernel.org>,
"open list:XEN SWIOTLB SUBSYSTEM" <iommu@...ts.linux.dev>,
Roberto Sassu <roberto.sassu@...weicloud.com>,
Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: Re: [PATCH v3 1/7] swiotlb: make io_tlb_default_mem local to
swiotlb.c
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.
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