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[Bug 1814343] Re: Initrd not loaded on riscv32

From: Thomas Huth
Subject: [Bug 1814343] Re: Initrd not loaded on riscv32
Date: Tue, 20 Apr 2021 08:17:19 -0000

The QEMU project is currently considering to move its bug tracking to another 
system. For this we need to know which bugs are still valid and which could be 
closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state 
back to "New" within the next 60 days, otherwise this report will be marked as 
"Expired". Or mark it as "Fix Released" if the problem has been solved with a 
newer version of QEMU already. Thank you and sorry for the inconvenience.

** Changed in: qemu
       Status: Confirmed => Incomplete

** Tags added: riscv

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  Initrd not loaded on riscv32

Status in QEMU:

Bug description:
  I attempted to run qemu with a ram disk. However, when reading the
  contents of the disk from within the VM I only get back zeros.

  I was able to trace the issue to a mismatch of expectations on line 93
  of hw/riscv/virt.c. Specifically, when running in 32-bit mode the
  value of kernel_entry is sign extended to 64-bits, but
  load_image_targphys expects the start address to not be sign extended.

  Straw man patch (works for 32-bit but would probably break 64-bit

  diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
  index e7f0716fb6..32216f993c 100644
  --- a/hw/riscv/virt.c
  +++ b/hw/riscv/virt.c
  @@ -90,7 +90,7 @@ static hwaddr load_initrd(const char *filename, uint64_t 
        * halfway into RAM, and for boards with 256MB of RAM or more we put
        * the initrd at 128MB.
  -    *start = kernel_entry + MIN(mem_size / 2, 128 * MiB);
  +    *start = (kernel_entry & 0xffffffff) + MIN(mem_size / 2, 128 * MiB);
       size = load_ramdisk(filename, *start, mem_size - *start);
       if (size == -1) {

  Run command:

  $ qemu/build/riscv32-softmmu/qemu-system-riscv32 -machine virt -kernel
  mykernel.elf -nographic -initrd payload

  Commit hash:


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