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Disable PAT in linux VMs

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Apparently kernel patch "x86/cpa: Use pte_attrs instead of pte_flags on
CPA/set_p.._wb/wc operations" (in out repo) doesn't fully solve the
problem and sometimes qubes-gui agent crashes with message like
"qubes-gui:664 map pfn expected mapping type write-back for [mem
0x00093000-0x00093fff], got uncached-minus".
Because PAT we really need only in dom0 (lack of it dramatically
decrease performance of some graphics drivers), we can simply disable it
in VM - as it is currently done in upstream kernel.
This commit is contained in:
Marek Marczykowski-Górecki 2014-04-16 16:07:59 +02:00
parent 8694e4ffbb
commit ef09f2ed2a
1 changed files with 2 additions and 2 deletions
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core/qubes.py
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@ -80,8 +80,8 @@ vm_files = {
defaults = { defaults = {
'memory': 400, 'memory': 400,
'kernelopts': "", 'kernelopts': "nopat",
'kernelopts_pcidevs': "iommu=soft swiotlb=4096", 'kernelopts_pcidevs': "nopat iommu=soft swiotlb=4096",
'dom0_update_check_interval': 6*3600, 'dom0_update_check_interval': 6*3600,