Date: Tue, 4 Aug 2020 17:00:03 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: Ottavio Caruso <ottavio2006-usenet2012@yahoo.com>, freebsd-hackers@freebsd.org Subject: Re: [xpost,repost] VGA false positive in dmesg? Message-ID: <a2a4cd6a-1889-86f1-49e4-4be1fb0bb7fa@grosbein.net> In-Reply-To: <rgb51b$10i4$1@ciao.gmane.io> References: <rgb51b$10i4$1@ciao.gmane.io>
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04.08.2020 15:08, Ottavio Caruso via freebsd-hackers wrote: > Hi, > > [originally mailed to freebsd-questions, but I didn't get any feedback over there] > > I've launched a FreeBSD 12.1 instance in qemu (pay attention to "-vga > none"). Host is Linux: > > qemu-system-x86_64 \ > -drive if=virtio,file=/home/oc/VM/img/freebsd.image,index=0,media=disk \ > -M q35,accel=kvm -m 250M -cpu host -smp $(nproc) \ > -nic user,hostfwd=tcp:127.0.0.1:5554-:22,model=virtio-net-pci \ > -daemonize -display none -vga none \ > -serial mon:telnet:127.0.0.1:6664,server,nowait \ > > In the guest: > > oc@FreeBSD:~ % pciconf -vl > hostb0@pci0:0:0:0: class=0x060000 card=0x11001af4 chip=0x29c08086 > rev=0x00 hdr=0x00 > vendor = 'Intel Corporation' > device = '82G33/G31/P35/P31 Express DRAM Controller' > class = bridge > subclass = HOST-PCI > virtio_pci0@pci0:0:1:0: class=0x020000 card=0x00011af4 chip=0x10001af4 > rev=0x00 hdr=0x00 > vendor = 'Red Hat, Inc.' > device = 'Virtio network device' > class = network > subclass = ethernet > virtio_pci1@pci0:0:2:0: class=0x010000 card=0x00021af4 chip=0x10011af4 > rev=0x00 hdr=0x00 > vendor = 'Red Hat, Inc.' > device = 'Virtio block device' > class = mass storage > subclass = SCSI > virtio_pci2@pci0:0:3:0: class=0x010000 card=0x00021af4 chip=0x10011af4 > rev=0x00 hdr=0x00 > vendor = 'Red Hat, Inc.' > device = 'Virtio block device' > class = mass storage > subclass = SCSI > isab0@pci0:0:31:0: class=0x060100 card=0x11001af4 chip=0x29188086 > rev=0x02 hdr=0x00 > vendor = 'Intel Corporation' > device = '82801IB (ICH9) LPC Interface Controller' > class = bridge > subclass = PCI-ISA > ahci0@pci0:0:31:2: class=0x010601 card=0x11001af4 chip=0x29228086 > rev=0x02 hdr=0x00 > vendor = 'Intel Corporation' > device = '82801IR/IO/IH (ICH9R/DO/DH) 6 port SATA Controller > [AHCI mode]' > class = mass storage > subclass = SATA > none0@pci0:0:31:3: class=0x0c0500 card=0x11001af4 chip=0x29308086 > rev=0x02 hdr=0x00 > vendor = 'Intel Corporation' > device = '82801I (ICH9 Family) SMBus Controller' > class = serial bus > subclass = SMBus > > However, in dmesg: > > oc@FreeBSD:~ % dmesg | grep -i vga > VT(vga): text 80x25 > vtvga0: <VT VGA driver> on motherboard > vga0: <Generic ISA VGA> at port 0x3b0-0x3bb iomem 0xb0000-0xb7fff > pnpid PNP0900 on isa0 > > I don't know how to interpret this output. pciconf deals with PCI/PCI-E only but your guest detects ISA VGA device. Compare with real VGA hardware: VT(vga): resolution 640x480 vtvga0: <VT VGA driver> on motherboard vgapci0: <VGA-compatible display> port 0xb000-0xb0ff mem 0xd0000000-0xdfffffff,0xfc3f0000-0xfc3fffff,0xfc200000-0xfc2fffff irq 18 at device 5.0 on pci1 vgapci0: Boot video device > I don't think it's a qemu issue, because I've done the same with NetBSD and OpenBSD guests and > there's no trace of vga in their dmesg. Maybe your guest has hw.vga.acpi_ignore_no_vga=1 in the kernel environment or some other non-default "hw.vga" knobs, check it out with kenv(1). You can also try adding to /boot/loader.conf: hint.vtvga.0.disabled=1 As for NetBSD/OpenBSD, they could drop ISA PNP VGA support or qemu settings differ for them.
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