[Qemu-devel] [Bug 1735576] [NEW] Support more than 4G memory for guest with Intel HAXM acceleration

[Hu Jun]

Public bug reported:

setup:

host: windows 7 professional 64bit
guest: centos 7
qemu 2.10.92
haxm 6.2.1

issue: when assign 4096M or more memory to the guest, I got following error 
message:
E:\qemuvm\vm-svr>qemu-system-x86_64 -accel hax -hda centos-1.vdi -m 4096
HAX is working and emulator runs in fast virt mode.
Failed to allocate 0 memory
hax_transaction_commit: Failed mapping @0x0000000000000000+0xc0000000 flags 00
hax_transaction_commit: Failed mapping @0x0000000100000000+0x40000000 flags 00
VCPU shutdown request
VCPU shutdown request
if I change memory to 4095M, guest VM boot up without issue

E:\qemuvm\vm-svr>qemu-system-x86_64 -accel hax -hda centos-1.vdi -m 4095
HAX is working and emulator runs in fast virt mode.


This is known limitation, I already raised a request on HAXM github site for 
fix this: https://github.com/intel/haxm/issues/13, and it got accepted will be 
fixed in next haxm release; however it seems there is also qemu side work 
(according to haxm dev), so I raise this for qemu side fix;

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1735576

Title:
  Support more than 4G memory for guest with Intel HAXM acceleration

Status in QEMU:
  New

Bug description:
  setup:

  host: windows 7 professional 64bit
  guest: centos 7
  qemu 2.10.92
  haxm 6.2.1

  issue: when assign 4096M or more memory to the guest, I got following error 
message:
  E:\qemuvm\vm-svr>qemu-system-x86_64 -accel hax -hda centos-1.vdi -m 4096
  HAX is working and emulator runs in fast virt mode.
  Failed to allocate 0 memory
  hax_transaction_commit: Failed mapping @0x0000000000000000+0xc0000000 flags 00
  hax_transaction_commit: Failed mapping @0x0000000100000000+0x40000000 flags 00
  VCPU shutdown request
  VCPU shutdown request
  if I change memory to 4095M, guest VM boot up without issue

  E:\qemuvm\vm-svr>qemu-system-x86_64 -accel hax -hda centos-1.vdi -m 4095
  HAX is working and emulator runs in fast virt mode.

  
  This is known limitation, I already raised a request on HAXM github site for 
fix this: https://github.com/intel/haxm/issues/13, and it got accepted will be 
fixed in next haxm release; however it seems there is also qemu side work 
(according to haxm dev), so I raise this for qemu side fix;

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