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* Gabriel C <nix.or.die@googlemail.com> wrote: > Hi Ingo, > > When using an 64bit ( didn't got time to test 32bit now ) kernel[1] > with PAT enabled , kvm-intel does not work anymore. > > When modprobing kvm-intel , kvm is saying VT extension is disable by > BIOS which isn't true. When disabling PAT again ( no changes to BIOS ) > kvm-intel works again here. > > Is that an known problem ? no, that side-effect was not known. Cc:-ed more folks. > If you need more infos just let me know. > > Gabriel > > [1] 2.6.25-05096-gb1721d0-dirty > with following patches : > http://lkml.org/lkml/2008/4/26/37 > http://lkml.org/lkml/2008/4/26/24 > http://lkml.org/lkml/2008/4/25/107 thanks - that should be enough for now. We'll try to reproduce these problems. A blind guess: maybe it's the CONFIG_NONPROMISC_DEVMEM somehow breaks Qemu. With the patch below you'd be able to disable NONPROMISC_DEVMEM without disabling PAT. Ingo diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 4d350b5..4aa4180 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1049,9 +1049,9 @@ config MTRR See <file:Documentation/mtrr.txt> for more information. config X86_PAT - def_bool y + bool prompt "x86 PAT support" - depends on MTRR && NONPROMISC_DEVMEM + depends on MTRR help Use PAT attributes to setup page level cache control. | ||||||||||||
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