[RFC, PATCH] x86_64: KAISER - do not map kernel in user mode https://lkml.org/lkml/2017/5/4/220 … @mlqxyz @misc0110 @BloodyTangerine #ESSoS17 #ruhrsec
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oh, cool! that looks a lot like what paravirtualized Xen is already doing for 64-bit guests
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are you sure? what's with 0xffff800000000000 to 0xffff87ffffffffff ? https://wiki.xen.org/wiki/X86_Paravirtualised_Memory_Management#Virtual_Address_Space … looks like a shared address space...
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https://gist.github.com/thejh/b8be219d48084630ec0aed41ee71aee2 … user-mode pagetables of a 64-bit Xen PV guest. you can see that the hypervisor is mapped, but the guest kernel isn't
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(and it has to be that way because guest user and guest kernel run in the same ring)
5:47 AM - 4 May 2017
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