On 9/27/2023 11:23 PM, Vladimir 'phcoder' Serbinenko wrote:
> That is not the correct solution. Correct solution is to use trampoline
> facility like e.g. ppc does. Can you post the full reproduction
> instructions?
>
1. prepare the host for pcie passthrough, e.g. on ubuntu, put something
like the following to kernel cmd, the pci ids are the pci devices to
passthrough:
intel_iommu=on iommu=pt vfio-pci.ids=10de:0f02,10de:0e08
2. apply the patch mentioned below to qemu commit ccb86f079a9e4
3. run qemu as follows:
qemu-system-riscv64
-nographic \
-M virt,pflash0=pflash0,pflash1=pflash1,acpi=off \
-m 3G -smp 2 \
-blockdev
node-name=pflash0,driver=file,read-only=on,filename=RISCV_VIRT_CODE.fd \
-blockdev node-name=pflash1,driver=file,filename=RISCV_VIRT_VARS.fd \
-device vfio-pci,host=01:00.0 -device vfio-pci,host=01:00.1 \
-device virtio-blk-device,drive=hd0 \
-drive file=fat:rw:/home/wufei/src/fat,id=hd0
4. build and put grub.efi to the directory 'fat'
5. on uefi shell, run grub.efi
Thanks,
Fei.
> Le lun. 25 sept. 2023, 10:53, Wu, Fei <[email protected]
> <mailto:[email protected]>> a écrit :
>
> Hi All,
>
> I'm enabling PCIe passthrough on qemu riscv, the physical memory
> range between 3GB and 4GB is reserved. Therefore if guest has 4GB ram,
> two ranges are created as [2G, 3G) and [4G, 7G). More details can be
> found here:
>
> https://lore.kernel.org/all/cakmqykmtazt5sacumd4vxyfgaqibpzqjahttsusb+yekhcy...@mail.gmail.com/T/
>
> <https://lore.kernel.org/all/cakmqykmtazt5sacumd4vxyfgaqibpzqjahttsusb+yekhcy...@mail.gmail.com/T/>
>
> When run grub.efi from uefi shell, a relocation problem happened in
> grub_arch_dl_relocate_symbols() of grub-core/kern/riscv/dl.c:
>
> case R_RISCV_CALL:
> case R_RISCV_CALL_PLT:
> {
> grub_uint32_t *abs_place = place;
> grub_ssize_t off = sym_addr - (grub_addr_t) place;
> grub_uint32_t hi20, lo12;
>
> if (off != (grub_int32_t) off)
> return grub_error (GRUB_ERR_BAD_MODULE, "relocation
> overflow");
>
> It requires `off' in the range of int32, but it's not enforced since the
> >4GB memory can be used. I'm not familiar with grub, but this patch does
> work for me:
>
> --- a/include/grub/riscv64/efi/memory.h
> +++ b/include/grub/riscv64/efi/memory.h
> @@ -1,6 +1,6 @@
> #ifndef GRUB_MEMORY_CPU_HEADER
> #include <grub/efi/memory.h>
>
> -#define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffffffffULL
> +#define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffffULL
>
> Any comments?
>
> Thanks,
> Fei.
>
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