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[Bug 1294227] Re: migration wrong handling of KVM_GET_DIRTY_LOG ioctl


From: Thomas Huth
Subject: [Bug 1294227] Re: migration wrong handling of KVM_GET_DIRTY_LOG ioctl
Date: Tue, 09 Feb 2021 14:25:49 -0000

Patch has been merged here:
https://gitlab.com/qemu-project/qemu/-/commit/38e0b7904eca7cd32

** Changed in: qemu
       Status: Confirmed => Fix Committed

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https://bugs.launchpad.net/bugs/1294227

Title:
  migration wrong handling of KVM_GET_DIRTY_LOG ioctl

Status in QEMU:
  Fix Committed

Bug description:
  In the code below kvm_vm_ioctl(...) can return --errno != -1 from ioctl call, 
 but return only checks for -1. 
  Found during KVM-ARM migration which apperead to go through but was actually 
failing getting 
  memslot dirty bitmap.

  static int kvm_physical_sync_dirty_bitmap(....)
  {
   ....
   if(kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
     - err out
   }
   ... continue
  }

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