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[192.0.220.237]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6d3541782desm39387096d6.112.2024.11.03.07.39.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 03 Nov 2024 07:39:52 -0800 (PST) Date: Sun, 3 Nov 2024 10:39:50 -0500 From: Mark Johnston To: Konstantin Belousov Cc: src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: 0f5116d7efe3 - main - AMD IOMMU driver Message-ID: References: <202411022346.4A2NkeBT097606@gitrepo.freebsd.org> List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-all@freebsd.org Sender: owner-dev-commits-src-all@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202411022346.4A2NkeBT097606@gitrepo.freebsd.org> X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US] X-Rspamd-Queue-Id: 4XhJgt4zwhz4JLY X-Spamd-Bar: ---- On Sat, Nov 02, 2024 at 11:46:40PM +0000, Konstantin Belousov wrote: > The branch main has been updated by kib: > > URL: https://cgit.FreeBSD.org/src/commit/?id=0f5116d7efe33c81f0b24b56eec78af37898f500 > > commit 0f5116d7efe33c81f0b24b56eec78af37898f500 > Author: Konstantin Belousov > AuthorDate: 2024-05-12 10:20:11 +0000 > Commit: Konstantin Belousov > CommitDate: 2024-11-02 23:45:40 +0000 > > AMD IOMMU driver > > This driver is functionally equivalent to the in-tree Intel DMAR code. > It handles busdma and interrupt remapping from the host OS. There is no > integration with bhyve, and the stub iommu drivers in bhyve code cannot > coexist with this driver (planned). > > The biggest architectural problem with the code is that the AMD IOMMU > units are enumerated as PCIe-attached security devices, which is much > later after HPET and IOAPIC drivers attached and actived interrupts. > Because of this, HPET FSB interrupts and IOAPIC interrupts are always > identity-mapped. > > The code is of late alpha quality. By default the driver is disabled. > To enable for testing, set in loader.conf: > hw.amdiommu.enable=1 > hw.iommu.dma=1 <- to enable iommu busdma > hw.iommu.ir=1 <- to enable interrupt remapping > > Discussed with: emaste > Sponsored by: Advanced Micro Devices (AMD) > Sponsored by: The FreeBSD Foundation > MFC after: 1 week > Differential revision: https://reviews.freebsd.org/D47256 This appears to break loading of vmm.ko, as sys/amd64/vmm/amd/amdiommu.c already defines a driver called "amdiommu". Perhaps the module in vmm should be renamed to amdviiommu or so?