On Tue, 2018-06-19 at 08:32 -0700, Dave Hansen wrote: > > For 32-bit (albeit not supported at this point) it makes sense to always > > use kmap_atomic_pfn() as the virtua address area is very limited. > > That makes no sense. 32-bit kernels have plenty of virtual address > space if not using highmem. AFAIK the vmalloc area is located in the last 128MB that and ioremap() of EPC would consume a big portion of that. > > KVM works only with writable MSRs. Driver works both with writable > > and read-only MSRs. > > Could you help with my confusion by documenting this a bit? Sure. /Jarkko
