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

[lixianglai]

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(-)