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Date:   Sat, 13 May 2017 14:58:54 -0700
From:   PGNet Dev <pgnet.dev@...il.com>
To:     Valentin Vidic <Valentin.Vidic@...Net.hr>
Cc:     Andrew Cooper <andrew.cooper3@...rix.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Clemens Ladisch <clemens@...isch.de>,
        xen-devel@...ts.xenproject.org
Subject: Re: [Xen-devel] HPET enabled in BIOS, not presented as
 available_clocksource -- config, kernel code, &/or BIOS?

On 5/13/17 2:32 PM, Valentin Vidic wrote:
> On Sat, May 13, 2017 at 02:06:28PM -0700, PGNet Dev wrote:
>> xl dmesg | grep -i hpet   | grep -vi command
>>   [    1.365876] hpet_acpi_add: no address or irqs in _CRS
>>   [    1.365876] hpet_acpi_add: no address or irqs in _CRS
> 
> Ah, guess this is caused by console_to_ring boot option.
> 
> Better check you are not missing info from the Xen ring buffer.
> It should start with the Xen version like this:
> 

Interesting.

With, currently,

	GRUB_CMDLINE_LINUX_XEN_REPLACE="... systemd.log_level=debug systemd.log_target=kmsg earlyprintk=xen,keep debug loglevel=8"

and

	GRUB_CMDLINE_XEN=" ... console_timestamps console_to_ring conring_size=64 sched=credit2 sched_debug log_buf_len=16M iommu=verbose apic_verbosity=verbose loglvl=all guest_loglvl=all noreboot=false sync_console=true"

I've only

	xl dmesg | head
		299] sd 1:0:0:0: [sdb] 5860533168 512-byte logical blocks: (3.00 TB/2.73 TiB)
		[    9.449299] sd 1:0:0:0: [sdb] 5860533168 512-byte logical blocks: (3.00 TB/2.73 TiB)
		[    9.449300] sd 1:0:0:0: [sdb] 4096-byte physical blocks
		[    9.449300] sd 1:0:0:0: [sdb] 4096-byte physical blocks
		[    9.449328] sd 1:0:0:0: [sdb] Write Protect is off
		[    9.449328] sd 1:0:0:0: [sdb] Write Protect is off
		[    9.449329] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
		[    9.449329] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
		[    9.449347] sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
		[    9.449347] sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA

Whereas in serial console,

	    Booting `OpenSUSE, with Xen hypervisor'Booting `OpenSUSE, with Xen hypervisor'



	Loading Xen 4.9.0_04-493 with Linux 4.11.0-4.gcb15206-default ...Loading Xen 4.9.0_04-493 wit
	h Linux 4.11.0-4.gcb15206-default ...

	/EndEntire
	/EndEntire
	file path: file path: /ACPI(a0341d0,0)/ACPI(a0341d0,0)/PCI(1,1c)/PCI(1,1c)/PCI(0,0)/PCI(0,0)/
	PCI(0,1)/PCI(0,1)/PCI(0,0)/PCI(0,0)/HardwareVendor
	(cf31fac5-c24e-11d2-85f3-00a0c93ec93b)[1: 
	/HardwareVendor(cf31fac5-c24e-11d2-85f3-00a0c93ec93b)[1: 88 88 ]]/HD(2,1000,96000,c5cc9661271
	ee648
	,2,2)/HD(2,1000,96000,c5cc9661271ee648,2,2)/File(\EFI\OPENSUSE)
	/File(\EFI\OPENSUSE)/File(xen-4.9.0_04-493.efi)/File(xen-4.9.0_04-493.efi)/EndEntire
	/EndEntire
	Xen 4.9.0_04-493 (c/s ) EFI loader
	Using configuration file 'xen-4.9.0_04-493.cfg'
	vmlinuz-4.11.0-4.gcb15206-default: 0x000000008b986000-0x000000008c06bf60
	initrd-4.11.0-4.gcb15206-default: 0x000000008aab2000-0x000000008b985978
	0x0000:0x00:0x19.0x0: ROM: 0x10000 bytes at 0x928a7018
	0x0000:0x04:0x00.0x0: ROM: 0x8000 bytes at 0x9289e018
	0x0000:0x10:0x00.0x0: ROM: 0x10800 bytes at 0x9287d018
	 __  __            _  _   ___   ___     ___  _  _      _  _   ___ _____ 
	 \ \/ /___ _ __   | || | / _ \ / _ \   / _ \| || |    | || | / _ \___ / 
	  \  // _ \ '_ \  | || || (_) | | | | | | | | || |_ __| || || (_) ||_ \ 
	  /  \  __/ | | | |__   _\__, | |_| | | |_| |__   _|__|__   _\__, |__) |
	 /_/\_\___|_| |_|    |_|(_)/_(_)___/___\___/   |_|       |_|   /_/____/ 
	                                  |_____|                               
	(XEN) Xen version 4.9.0_04-493 (abuild@...e.de) (gcc (SUSE Linux) 4.8.5) debug=y  Wed May 10 
	21:26:38 UTC 2017
	(XEN) Latest ChangeSet: 
	(XEN) Console output is synchronous.
	(XEN) Bootloader: EFI
	(XEN) Command line: dom0_mem=4096M,max:4096M dom0_max_vcpus=4 vga=gfx-1920x1080x16 com1=11520
	0,8n1,pci console=com1,vga console_timestamps console_to_ring conring_size=64 sched=credit2 s
	ched_debug reboot=acpi log_buf_len=16M iommu=verbose apic_verbosity=verbose loglvl=all guest_
	loglvl=all noreboot=false sync_console=true
	(XEN) Xen image load base address: 0x8c200000
	(XEN) Video information:
	(XEN)  VGA is graphics mode 800x600, 32 bpp
	(XEN) Disc information:
	(XEN)  Found 0 MBR signatures
	(XEN)  Found 6 EDD information structures
	(XEN) EFI RAM map:
	(XEN)  0000000000000000 - 0000000000008000 (reserved)
	(XEN)  0000000000008000 - 0000000000048000 (usable)
	...

Searching the *console* output for 'hpet',

	grep -i hpet tmp.txt
		(XEN) ACPI: HPET 9E8298F8, 0038 (r1 SUPERM SMCI--MB  1072009 AMI.        5)
		(XEN) ACPI: HPET id: 0x8086a701 base: 0xfed00000
		(XEN) [VT-D] MSI HPET: 0000:f0:0f.0
		(XEN) Platform timer is 14.318MHz HPET
		=xvc console=tty0 console=hvc0 elevator=deadline cpuidle cpufreq=xen:ondemand hpet=force,verb
		ose clocksource=hpet net.ifnames=1 biosdevname=1 pcie_aspm=off m
		[    0.000000] ACPI: HPET 0x000000009E8298F8 000038 (v01 SUPERM SMCI--MB 01072009 AMI. 000000
		[    0.000000] ACPI: HPET id: 0x8086a701 base: 0xfed00000
		xencons=xvc console=tty0 console=hvc0 elevator=deadline cpuidle cpufreq=xen:ondemand hpet=for
		ce,verbose clocksource=hpet net.ifnames=1 biosdevname=1 pcie_asp
		=xvc console=tty0 console=hvc0 elevator=deadline cpuidle cpufreq=xen:ondemand hpet=force,verb
		ose clocksource=hpet net.ifnames=1 biosdevname=1 pcie_aspm=off m
		[    0.000000] ACPI: HPET 0x000000009E8298F8 000038 (v01 SUPERM SMCI--MB 01072009 AMI. 000000
		[    0.000000] ACPI: HPET id: 0x8086a701 base: 0xfed00000
		xencons=xvc console=tty0 console=hvc0 elevator=deadline cpuidle cpufreq=xen:ondemand hpet=for
		ce,verbose clocksource=hpet net.ifnames=1 biosdevname=1 pcie_asp
		[    8.489692] hpet_acpi_add: no address or irqs in _CRS
		[    8.489692] hpet_acpi_add: no address or irqs in _CRS
		(XEN) [2017-05-13 21:40:15] HVM1 save: HPET

and, still

	cat /sys/devices/system/clocksource/clocksource0/available_clocksource
		tsc xen
	cat /sys/devices/system/clocksource/clocksource0/current_clocksource
		tsc


Does this perhaps imply that Xen correctly uses HPET

	(XEN) [VT-D] MSI HPET: 0000:f0:0f.0
	(XEN) Platform timer is 14.318MHz HPET

, noting:

	"If h/w supports per-channel MSI delivery mode (intr via FSB)," it's the best broadcast mechanism known so far"

but that Dom0 does not

	current_clocksource
		tsc

?

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