Date: Wed, 7 Sep 2016 00:02:31 -0700 From: Peter Grehan <grehan@freebsd.org> To: Dom <misc-freebsd@talk2dom.com> Cc: freebsd-virtualization@freebsd.org Subject: Re: Issues with GTX960 on CentOS7 using bhyve PCI passthru (FreeBSD 11-RC2) Message-ID: <62b2a72a-3662-5b3e-5029-f284a625d05b@freebsd.org> In-Reply-To: <727839e2-4be1-5661-8c19-6d13f73ad36f@talk2dom.com> References: <727839e2-4be1-5661-8c19-6d13f73ad36f@talk2dom.com>
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Hi Dom,
> Bhyve's ACPI table produces this error linux-side regardless of
> "pci=" setting:
>
> [ 0.163085] acpi PNP0A03:00: host bridge window
> [0xd000000000-0xd0100fffff] (ignored, not CPU addressable)
That one is most likely a bug in bhyve, where the space used for 64-bit
BAR placement isn't tested against the max physaddr width of the host CPU.
To confirm, would you be able to report on this value on your system ?
# sudo pkg install cpuid
# cpuid | grep ^80000008
80000008 00003027 00000000 00000000 00000000
^^
This is the output from a Xeon E3-1220 v3: 0x27 == 39 bits of phys
address (0x8000000000 max)
0xd000000000 requires >= 40 bits.
> 2. "can't derive routing for PCI INT"
>
> Linux-side dmesg related output:
>
> [ 1.677168] nvidia 0000:00:06.0: can't derive routing for PCI INT
> A [ 1.677600] nvidia 0000:00:06.0: PCI INT A: no GSI
...
> Host-side info (when GTX960 is NOT configured as a pass-thru dev):
...
> cap 05[68] = MSI supports 1 message, 64 bit enabled with 1 message
The device has an MSI capability, but the nvidia driver may not use it.
bhyve PCI passthrough requires the use of MSI/MSI-x interrupts, and
doesn't support using legacy interrupts.
This could be confirmed from the output of /proc/interrupts when
booting Linux on the system.
later,
Peter.
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