Date: Tue, 13 Aug 2024 18:17:12 -0700 From: Navdeep Parhar <np@FreeBSD.org> To: John Baldwin <jhb@FreeBSD.org>, src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: Re: git: f44ff2aba2d6 - main - bhyve: Treat the COMMAND register for PCI passthru devices as emulated Message-ID: <58a179b1-9e92-461a-8902-31bd0a8c057e@FreeBSD.org> In-Reply-To: <202407311450.46VEoql9014730@gitrepo.freebsd.org>
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On 7/31/24 7:50 AM, John Baldwin wrote: > The branch main has been updated by jhb: > > URL: https://cgit.FreeBSD.org/src/commit/?id=f44ff2aba2d64d1d9312cb55008dc90275ccdc04 > > commit f44ff2aba2d64d1d9312cb55008dc90275ccdc04 > Author: John Baldwin <jhb@FreeBSD.org> > AuthorDate: 2024-07-31 14:50:33 +0000 > Commit: John Baldwin <jhb@FreeBSD.org> > CommitDate: 2024-07-31 14:50:33 +0000 > > bhyve: Treat the COMMAND register for PCI passthru devices as emulated > > Don't pass through writes of the command register through to the > physical device. These registers do not need to be in sync, and in > some cases (e.g. when the guest is sizing the BAR and temporarily > disables decoding), the states need to diverge. This seems to break MSI-X interrupts for a device that is passed through to a VM. That is, the device generates an interrupt but the driver in the VM never receives it. Reverting this change fixes the problem. Regards, Navdeephome | help
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