From: "Alex Bennée" <alex.bennee@linaro.org>
To: Julien Grall <julien@xen.org>
Cc: xen-devel@lists.xenproject.org, masami.hiramatsu@linaro.org,
ehem+xen@m5p.com, bertrand.marquis@arm.com,
andre.przywara@arm.com, "Julien Grall" <jgrall@amazon.com>,
"Stefano Stabellini" <sstabellini@kernel.org>,
"Volodymyr Babchuk" <Volodymyr_Babchuk@epam.com>,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"George Dunlap" <george.dunlap@citrix.com>,
"Ian Jackson" <iwj@xenproject.org>,
"Jan Beulich" <jbeulich@suse.com>, "Wei Liu" <wl@xen.org>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [PATCH 0/4] xen/arm: Unbreak ACPI
Date: Wed, 30 Sep 2020 11:38:48 +0100 [thread overview]
Message-ID: <874knfpn0n.fsf@linaro.org> (raw)
In-Reply-To: <a42d2724-4d9b-a177-35c7-44bd0250f265@xen.org>
Julien Grall <julien@xen.org> writes:
> Hi Alex,
>
> On 29/09/2020 22:11, Alex Bennée wrote:
>>
>> Julien Grall <julien@xen.org> writes:
>>
>>> Hi Alex,
>>>
>>> On 29/09/2020 16:29, Alex Bennée wrote:
>>>>
>>>> Julien Grall <julien@xen.org> writes:
>>>>
>>>>> From: Julien Grall <jgrall@amazon.com>
>>>>>
>>>>> Hi all,
>>>>>
>>>>> Xen on ARM has been broken for quite a while on ACPI systems. This
>>>>> series aims to fix it.
>>>>>
>>>>> Unfortunately I don't have a system with ACPI v6.0 or later (QEMU seems
>>>>> to only support 5.1). So I did only some light testing.
>>>>
>>>> I was hoping to get more diagnostics out to get it working under QEMU
>>>> TCG so I think must of missed a step:
>>>>
>>>> Loading Xen 4.15-unstable ...
>>>> Loading Linux 4.19.0-11-arm64 ...
>>>> Loading initial ramdisk ...
>>>> Using modules provided by bootloader in FDT
>>>> Xen 4.15-unstable (c/s Sat Sep 26 21:55:42 2020 +0100 git:72f3d495d0) EFI loader
>>>> ...silence...
>>>>
>>>> I have a grub installed from testing on a buster base:
>>>>
>>>> dpkg --status grub-arm64-efi
>>>> Version: 2.04-8
>>>>
>>>> With:
>>>>
>>>> GRUB_CMDLINE_LINUX_DEFAULT=""
>>>> GRUB_CMDLINE_LINUX="console=ttyAMA0"
>>>> GRUB_CMDLINE_LINUX_XEN_REPLACE="console=hvc0 earlyprintk=xen"
>>>> GRUB_CMDLINE_XEN="loglvl=all guest_loglvl=all com1=115200,8n1,0x3e8,5console=com1,vg"
>>>>
>>>> And I built Xen with --enable-systemd and tweaked the hypervisor .config:
>>>>
>>>> CONFIG_EXPERT=y
>>>> CONFIG_ACPI=y
>>>>
>>>> So any pointers to make it more verbose would be helpful.
>>>
>>> The error is hapenning before Xen setup the console. You can get early
>>> output on QEMU if you rebuild Xen with the following .config options:
>>>
>>> CONFIG_DEBUG=y
>>> CONFIG_EARLY_UART_CHOICE_PL011=y
>>> CONFIG_EARLY_UART_PL011=y
>>> CONFIG_EARLY_PRINTK=y
>>> CONFIG_EARLY_UART_BASE_ADDRESS=0x09000000
>>> CONFIG_EARLY_UART_PL011_BAUD_RATE=0
>>> CONFIG_EARLY_PRINTK_INC="debug-pl011.inc"
>>
>> OK I can see it fails on the ACPI and then tries to fall back to FDT and
>> then fails to find the GIC:
>>
>> (XEN) CMDLINE[00000000f7bbe000]:chosen placeholder root=UUID=cf00cd3a-066b-4146-bedf-f811d3343077 ro console=hvc0 earlyprintk=xen
>> (XEN)
>> (XEN) Command line: placeholder loglvl=all guest_loglvl=all com1=115200,8n1,0x3e8,5console=com1,vg no-real-mode edd=off
>> (XEN) parameter "placeholder" unknown!
>> (XEN) parameter "no-real-mode" unknown!
>> (XEN) parameter "edd" unknown!
>> (XEN) ACPI: RSDP 138560000, 0024 (r2 BOCHS )
>> (XEN) ACPI: XSDT 138550000, 004C (r1 BOCHS BXPCFACP 1 1000013)
>> (XEN) ACPI: FACP 138510000, 010C (r5 BOCHS BXPCFACP 1 BXPC 1)
>> (XEN) ACPI: DSDT 138520000, 14A6 (r2 BOCHS BXPCDSDT 1 BXPC 1)
>> (XEN) ACPI: APIC 138500000, 018C (r3 BOCHS BXPCAPIC 1 BXPC 1)
>> (XEN) ACPI: GTDT 1384F0000, 0060 (r2 BOCHS BXPCGTDT 1 BXPC 1)
>> (XEN) ACPI: MCFG 1384E0000, 003C (r1 BOCHS BXPCMCFG 1 BXPC 1)
>> (XEN) ACPI: SPCR 1384D0000, 0050 (r2 BOCHS BXPCSPCR 1 BXPC 1)
>> (XEN) Unsupported FADT revision 5.1, should be 6.0+, will disable ACPI
>> (XEN) acpi_boot_table_init: FADT not found (-22)
>> (XEN) Domain heap initialised
>> (XEN) Booting using Device Tree
>> (XEN) Platform: Generic System
>> (XEN)
>> (XEN) ****************************************
>> (XEN) Panic on CPU 0:
>> (XEN) Unable to find compatible GIC in the device tree
>> (XEN) ****************************************
>> (XEN)
>> (XEN) Reboot in five seconds...
>>
>> Despite saying it is going to reboot it never manages to. Any idea how
>> it is trying to reset the system?
>
> This is a bit of chicken and eggs problem. To know the reset method, you
> need to parse the ACPI tables. As we can't parse then we don't know the
> reset method. So, Xen will just do an infinite loop.
Well you do get some ACPI tables - downgrading the minimum at least
restores the reset method detection. I wonder if it would be worth
defaulting to PSCI if you don't know rather than hang indefinitely?
FWIW the failure after that is failing to find the GIC - I'm just
looking at the MADT table parsing now. Why am I getting a sense of
DejaVu?
> It would probably be good to be more forthcoming with the users and say
> it will not reboot.
>
> Also, IIRC, the time subsystem is not yet initialized. So it might be
> possible to mdelay() doesn't work properly.
Surely that's an architectural subsystem so there is no reason that
couldn't be up and running.
>
> Cheers,
--
Alex Bennée
next prev parent reply other threads:[~2020-09-30 10:39 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-26 20:55 [PATCH 0/4] xen/arm: Unbreak ACPI Julien Grall
2020-09-26 20:55 ` [PATCH 1/4] xen/acpi: Rework acpi_os_map_memory() and acpi_os_unmap_memory() Julien Grall
2020-09-28 8:18 ` Jan Beulich
2020-09-28 9:58 ` Julien Grall
2020-09-28 10:09 ` Jan Beulich
2020-09-28 10:39 ` Julien Grall
2020-10-10 9:49 ` Julien Grall
2020-10-10 10:04 ` Julien Grall
2020-09-29 11:10 ` Rahul Singh
2020-10-01 0:06 ` Stefano Stabellini
2020-10-01 15:09 ` Julien Grall
2020-09-26 20:55 ` [PATCH 2/4] xen/arm: acpi: The fixmap area should always be cleared during failure/unmap Julien Grall
2020-09-29 11:13 ` Rahul Singh
2020-10-01 0:30 ` Stefano Stabellini
2020-10-01 15:14 ` Julien Grall
2020-09-26 20:55 ` [PATCH 3/4] xen/arm: Check if the platform is not using ACPI before initializing Dom0less Julien Grall
2020-09-29 11:17 ` Rahul Singh
2020-09-30 23:26 ` Stefano Stabellini
2020-09-26 20:55 ` [PATCH 4/4] xen/arm: Introduce fw_unreserved_regions() and use it Julien Grall
2020-09-30 23:40 ` Stefano Stabellini
2020-10-01 15:34 ` Julien Grall
2020-09-27 1:47 ` [PATCH 0/4] xen/arm: Unbreak ACPI Elliott Mitchell
2020-09-29 15:28 ` Elliott Mitchell
2020-09-28 6:47 ` Masami Hiramatsu
2020-09-28 12:41 ` [PATCH] xen: acpi: Hide UART address only if SPCR exists Masami Hiramatsu
2020-09-28 12:42 ` Masami Hiramatsu
2021-01-19 7:25 ` Elliott Mitchell
2021-01-20 18:05 ` Julien Grall
2020-09-28 13:00 ` [PATCH 0/4] xen/arm: Unbreak ACPI Masami Hiramatsu
2020-10-16 22:33 ` Xen-ARM EFI/ACPI problems (was: Re: [PATCH 0/4] xen/arm: Unbreak ACPI) Elliott Mitchell
2020-10-17 5:12 ` Elliott Mitchell
2020-10-08 18:39 ` [PATCH 0/4] xen/arm: Unbreak ACPI Elliott Mitchell
2020-10-09 9:39 ` Julien Grall
2020-10-09 14:22 ` Elliott Mitchell
2020-10-09 18:15 ` Julien Grall
2020-10-09 22:36 ` Elliott Mitchell
2020-10-09 21:49 ` Elliott Mitchell
2020-10-10 11:02 ` Julien Grall
2020-10-12 19:02 ` Stefano Stabellini
2020-10-12 21:34 ` Elliott Mitchell
2020-10-14 1:06 ` Stefano Stabellini
2020-10-14 1:37 ` Elliott Mitchell
2020-10-14 17:47 ` Julien Grall
2020-10-15 18:00 ` Stefano Stabellini
2020-10-14 17:44 ` Julien Grall
2020-09-29 11:10 ` Rahul Singh
2020-09-29 15:29 ` Alex Bennée
2020-09-29 17:07 ` Julien Grall
2020-09-29 21:11 ` Alex Bennée
2020-09-29 23:39 ` André Przywara
2020-09-30 8:51 ` Alex Bennée
2020-09-30 10:35 ` Julien Grall
2020-09-30 9:42 ` Julien Grall
2020-09-30 10:38 ` Alex Bennée [this message]
2020-09-30 11:10 ` Julien Grall
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