Date: Thu, 12 Mar 2020 10:31:39 +1000 From: Peter Grehan <grehan@freebsd.org> To: Alex Troussov <erleya@gmail.com> Cc: freebsd-virtualization@freebsd.org Subject: Re: [GPU pass-through] no compatible bridge window for claimed BAR Message-ID: <07921dcf-11d5-f440-a42f-d7ec950cab10@freebsd.org> In-Reply-To: <CAONCVozTcKP_=8AdOCfFNiRQnQ254%2BFVn0ZDRK-V8Zo%2BFFd_qQ@mail.gmail.com> References: <CAONCVozTcKP_=8AdOCfFNiRQnQ254%2BFVn0ZDRK-V8Zo%2BFFd_qQ@mail.gmail.com>
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Hi Alex, >> dmesg | grep "no compatible bridge window" > pci 0000:00:01.0: can't claim BAR 1 [mem 0xd000000000-0xd00fffffff 64bit > pref]: no compatible bridge window ...> From what I can read from all the info above, > somehow the requested memory space for BAR1 for that device is > 0xd000000000-0xd00fffffff which is out of addressable space on the system. Yep, that's the issue, and it's a bhyve bug - there is no check to see if the 64-bit window is within the addressable range of the processor. A quick fix is to change the constant for that range in pci_emul.c #define PCI_EMUL_MEMBASE64 0xD000000000UL #define PCI_EMUL_MEMLIMIT64 0xFD00000000UL .. to a value that is within the address bits of the CPU, but also above guest DRAM. later, Peter.
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