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Re: [PULL v2 1/1] loongarch: Change the UEFI loading mode to loongarch


From: lixianglai
Subject: Re: [PULL v2 1/1] loongarch: Change the UEFI loading mode to loongarch
Date: Thu, 7 Mar 2024 09:36:06 +0800
User-agent: Mozilla/5.0 (X11; Linux loongarch64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0

Hi huacai:

Hi, Xianglai,

How to pass the BIOS file to qemu after this patch? With the old
cmdline I get an RCU stall and freeze the kvm host.

The bios also has the corresponding code modification,

you can update the code from the UEFI community to recompile UEFI,

or you can directly obtain the compiled bios from the link below:

https://github.com/lixianglai/LoongarchVirtFirmware

Thanks,

Xianglai.


Huacai

On Sat, Mar 2, 2024 at 12:14 PM lixianglai <lixianglai@loongson.cn> wrote:
Hi Philippe:

On 29/2/24 12:38, Song Gao wrote:

From: Xianglai Li <lixianglai@loongson.cn>

The UEFI loading mode in loongarch is very different
from that in other architectures:loongarch's UEFI code
is in rom, while other architectures' UEFI code is in flash.

loongarch UEFI can be loaded as follows:
-machine virt,pflash=pflash0-format
-bios ./QEMU_EFI.fd

Other architectures load UEFI using the following methods:
-machine virt,pflash0=pflash0-format,pflash1=pflash1-format

loongarch's UEFI loading method makes qemu and libvirt incompatible
when using NVRAM, and the cost of loongarch's current loading method
far outweighs the benefits, so we decided to use the same UEFI loading
scheme as other architectures.


FYI I'm still trying to find a way to avoid that, planning to discuss
more with libvirt folks. Well, maybe it is a waste of my time and I
should just stop worrying / caring about this long standing issue.

Thank you so much for your attention to this issue

and your long-standing contributions to the community!!:-)

Best regards,

Xianglai.


Cc: Andrea Bolognani <abologna@redhat.com>
Cc: maobibo@loongson.cn
Cc: Philippe Mathieu-Daudé <philmd@linaro.org>
Cc: Song Gao <gaosong@loongson.cn>
Cc: zhaotianrui@loongson.cn
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Tested-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Message-Id: 
<0bd892aa9b88e0f4cc904cb70efd0251fc1cde29.1708336919.git.lixianglai@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
---
   hw/loongarch/acpi-build.c   |  29 +++++++++--
   hw/loongarch/virt.c         | 101 ++++++++++++++++++++++++++----------
   include/hw/loongarch/virt.h |  10 ++--
   3 files changed, 107 insertions(+), 33 deletions(-)







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