On 06/04/17 16:01, Kirill A. Shutemov wrote: > Most of things are in place and we can enable support of 5-level paging. > > Enabling XEN with 5-level paging requires more work. The patch makes XEN > dependent on !X86_5LEVEL. > > Signed-off-by: Kirill A. Shutemov <[email protected]> > --- > arch/x86/Kconfig | 5 +++++ > arch/x86/xen/Kconfig | 1 + > 2 files changed, 6 insertions(+) > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 4e153e93273f..7a76dcac357e 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -318,6 +318,7 @@ config FIX_EARLYCON_MEM > > config PGTABLE_LEVELS > int > + default 5 if X86_5LEVEL > default 4 if X86_64 > default 3 if X86_PAE > default 2 > @@ -1390,6 +1391,10 @@ config X86_PAE > has the cost of more pagetable lookup overhead, and also > consumes more pagetable space per process. > > +config X86_5LEVEL > + bool "Enable 5-level page tables support" > + depends on X86_64 > + > config ARCH_PHYS_ADDR_T_64BIT > def_bool y > depends on X86_64 || X86_PAE > diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig > index 76b6dbd627df..b90d481ce5a1 100644 > --- a/arch/x86/xen/Kconfig > +++ b/arch/x86/xen/Kconfig > @@ -5,6 +5,7 @@ > config XEN > bool "Xen guest support" > depends on PARAVIRT > + depends on !X86_5LEVEL > select PARAVIRT_CLOCK > select XEN_HAVE_PVMMU > select XEN_HAVE_VPMU >
Just a heads up: this last change will conflict with the Xen tree. Can't we just ignore the additional level in Xen pv mode and run with 4 levels instead? Juergen
