• Avi Kivity's avatar
    [PATCH] KVM: MMU: Perform access checks in walk_addr() · 7993ba43
    Avi Kivity authored
    Check pte permission bits in walk_addr(), instead of scattering the checks all
    over the code.  This has the following benefits:
    
    1. We no longer set the accessed bit for accessed which fail permission checks.
    2. Setting the accessed bit is simplified.
    3. Under some circumstances, we used to pretend a page fault was fixed when
       it would actually fail the access checks.  This caused an unnecessary
       vmexit.
    4. The error code for guest page faults is now correct.
    
    The fix helps netbsd further along booting, and allows kvm to pass the new mmu
    testsuite.
    Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    7993ba43
paging_tmpl.h 12.4 KB