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[Bug 1902262] Re: vmstate_load_state return error into virtio_load funct

From: Launchpad Bug Tracker
Subject: [Bug 1902262] Re: vmstate_load_state return error into virtio_load function
Date: Fri, 09 Jul 2021 04:17:20 -0000

[Expired for QEMU because there has been no activity for 60 days.]

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

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  vmstate_load_state return error into virtio_load function

Status in QEMU:

Bug description:
  Qemu version 4.2.1

  In the function of virtio_load, the vmstate_load_state will return
  error in the following case.

  The virtio is legacy mode(disable-modern=on,disable-legacy=off),
  virtio_device is in reset state.

  In the the function of "vmstate_load_state", it will load all subsection. For 
the vmstate_virtio_extra_state subsection. 
  It will execute:
  vmstate_load_state   -->
            ret = field->info->get(f, curr_elem, size, field);    line 143  
                          -->  vmstate_load_state
  But if the f->buf_index is same with buf_size, qemu_peek_byte function will 
set "-EIO" error. 
  the field->info->get will return 0, then it will get the error "ret = 
qemu_file_get_error(f);". then the vmstate_load_state will return error.

  It output is "Failed to load virtio/extra_state:extra_state"

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