[Xen-users] dom0 pvh successfull, but no console

[Éliás Tamás <et@xxxxxxx>]

Hi all.

I have an ubuntu 18.04 LTS with edge kernel (v5), and I set up xen with
these options:

GRUB_CMDLINE_LINUX_DEFAULT="nomodeset nosplash quiet"
GRUB_CMDLINE_LINUX="ipv6.disable=1"
GRUB_CMDLINE_XEN_DEFAULT="dom0=pvh dom0_mem=4096M,max:4096M
dom0_max_vcpus=4 dom0_vcpus_pin"

without dom0=pvh everything works as expected. WITH dom0=pvh I have
network and I can SSH on the server, but I cannot see anything on the
screen. keystrokes via the keyboard are going in. The monitor does not
turn into sleep, but it is active, but completely blank. Not even a
cursor blinking.

I guess in pvh0 mode I should add something to the boot line to have the
phisical console enabled. Unfortunately both console=vga and
console=hvc0 turned to be efectless.

Does anyone has idea how can I bring back the local login screen (tty
console) while using dom0=pvh?

Also, for some reason I still see the qemu process running (even tough
that I should not need it ut I should not need it for dom0 pvh):

 /usr/bin/qemu-system-i386 -xen-domid 0 -xen-attach -name dom0
-nographic -M xenpv -daemonize -monitor /dev/null -serial /dev/null
-parallel /dev/null -nodefaults -no-user-config -pidfile
/var/run/xen/qemu-dom0.pid

Thank you.

Part of the xl dmesg:
(XEN) Detected 2400.105 MHz processor.
(XEN) Initing memory sharing.
(XEN) Intel VT-d iommu 0 supported page sizes: 4kB.
(XEN) Intel VT-d Snoop Control enabled.
(XEN) Intel VT-d Dom0 DMA Passthrough not enabled.
(XEN) Intel VT-d Queued Invalidation enabled.
(XEN) Intel VT-d Interrupt Remapping enabled.
(XEN) Intel VT-d Posted Interrupt not enabled.
(XEN) Intel VT-d Shared EPT tables not enabled.
(XEN) I/O virtualisation enabled
(XEN)  - Dom0 mode: Relaxed
(XEN) Interrupt remapping enabled
(XEN) Enabled directed EOI with ioapic_ack_old on!
(XEN) ENABLING IO-APIC IRQs
(XEN)  -> Using old ACK method
(XEN) Allocated console ring of 32 KiB.
(XEN) VMX: Supported advanced features:
(XEN)  - APIC MMIO access virtualisation
(XEN)  - APIC TPR shadow
(XEN)  - Extended Page Tables (EPT)
(XEN)  - Virtual-Processor Identifiers (VPID)
(XEN)  - Virtual NMI
(XEN)  - MSR direct-access bitmap
(XEN)  - Unrestricted Guest
(XEN) HVM: ASIDs enabled.
(XEN) HVM: VMX enabled
(XEN) HVM: Hardware Assisted Paging (HAP) detected
(XEN) HVM: HAP page sizes: 4kB, 2MB, 1GB
(XEN) Brought up 16 CPUs
(XEN) Dom0 has maximum 816 PIRQs
(XEN) WARNING: PVH is an experimental mode with limited functionality
(XEN) Initial low memory virq threshold set at 0x4000 pages.
(XEN) Scrubbing Free RAM in background
(XEN) Std. Loglevel: Errors and warnings
(XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)


-- 

Éliás Tamás
Thomas Elias

ETIT[nwpro] KFT, Ügyvezető-Hálózatbiztonsági specialista
ETIT[nwpro] Ltd, General Manager-Network security specialist

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