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Re: Question: Enable LINUX_EFI_MEMRESERVE_TABLE_GUID in EFI
- To: "leo.yan@xxxxxxxxxx" <leo.yan@xxxxxxxxxx>
- From: Rahul Singh <Rahul.Singh@xxxxxxx>
- Date: Fri, 5 Aug 2022 11:44:37 +0000
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Peter Griffin <peter.griffin@xxxxxxxxxx>, Jerome Forissier <jerome.forissier@xxxxxxxxxx>, Marc Zyngier <maz@xxxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>
- Delivery-date: Fri, 05 Aug 2022 11:44:53 +0000
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- Thread-topic: Question: Enable LINUX_EFI_MEMRESERVE_TABLE_GUID in EFI
Hi Leo,
> On 4 Aug 2022, at 9:12 am, Leo Yan <leo.yan@xxxxxxxxxx> wrote:
>
> Hi there,
>
> Now I am working on Ampere Altra SoC platform, with Xen (4.16) and Linux
> kernel (5.15.23).
>
> I observed a warning is reported by Linux kernel in the booting flow:
>
> [ 0.403737] ------------[ cut here ]------------
> [ 0.403738] WARNING: CPU: 30 PID: 0 at
> drivers/irqchip/irq-gic-v3-its.c:3074 its_cpu_init+0x814/0xae0
> [ 0.403745] Modules linked in:
> [ 0.403748] CPU: 30 PID: 0 Comm: swapper/30 Tainted: G W
> 5.15.23-ampere-lts-standard #1
> [ 0.403752] pstate: 600001c5 (nZCv dAIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [ 0.403755] pc : its_cpu_init+0x814/0xae0
> [ 0.403758] lr : its_cpu_init+0x810/0xae0
> [ 0.403761] sp : ffff800009c03ce0
> [ 0.403762] x29: ffff800009c03ce0 x28: 000000000000001e x27:
> ffff880711f43000
> [ 0.403767] x26: ffff80000a3c0070 x25: fffffc1ffe0a4400 x24:
> ffff80000a3c0000
> [ 0.403770] x23: ffff8000095bc998 x22: ffff8000090a6000 x21:
> ffff800009850cb0
> [ 0.403774] x20: ffff800009701a10 x19: ffff800009701000 x18:
> ffffffffffffffff
> [ 0.403777] x17: 3030303035303031 x16: 3030313030303078 x15:
> 303a30206e6f6967
> [ 0.403780] x14: 6572206530312072 x13: 3030303030353030 x12:
> 3130303130303030
> [ 0.403784] x11: 78303a30206e6f69 x10: 6765722065303120 x9 :
> ffff80000870e710
> [ 0.403788] x8 : 6964657220646e75 x7 : 0000000000000003 x6 :
> 0000000000000000
> [ 0.403791] x5 : 0000000000000000 x4 : fffffc0000000000 x3 :
> 0000000000000010
> [ 0.403794] x2 : 000000000000ffff x1 : 0000000000010000 x0 :
> 00000000ffffffed
> [ 0.403798] Call trace:
> [ 0.403799] its_cpu_init+0x814/0xae0
> [ 0.403802] gic_starting_cpu+0x48/0x90
> [ 0.403805] cpuhp_invoke_callback+0x16c/0x5b0
> [ 0.403808] cpuhp_invoke_callback_range+0x78/0xf0
> [ 0.403811] notify_cpu_starting+0xbc/0xdc
> [ 0.403814] secondary_start_kernel+0xe0/0x170
> [ 0.403817] __secondary_switched+0x94/0x98
> [ 0.403821] ---[ end trace f68728a0d3053b70 ]---
>
> Looked into the code, the GICv3 driver tries to create persistent
> reservations for pending pages, and the persistent reservation table
> can be used by kexec/kdump. For the persistent reservations, it
> relies on MEMRESERVE EFI configuration table, but this table is not
> supported by xen.efi, I think this is the reason for the above oops.
Yes, you are right above warning is observed because Xen does not support
memreserve efi table. I also observed a similar warning on the N1SDP board.
>
> I checked that if I boot a host Linux (without Xen), then the EFI has
> provided MEMRESERVE configuration table, I can get below log:
>
> # dmesg | grep MEMRESERVE
> [ 0.000000] efi: TPMFinalLog=0x807f9ef0000 ACPI 2.0=0x807fa0d0018 ...
> MEMRESERVE=0x807f8141e98
>
> Just want to confirm, is anyone working on enabling MEMRESERVE EFI
> configuration table for Xen? And welcome any comments and
> suggestions!
>
Regards,
Rahul
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