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authorMarcelo Tosatti <mtosatti@redhat.com>2008-04-04 13:56:44 -0400
committerAvi Kivity <avi@qumranet.com>2008-04-27 05:00:58 -0400
commitbed1d1dfc4a458d82bcd258082638cbba860190d (patch)
tree344f9cbf54082161e54ba77164f55aec695b9403 /include/asm-um/archparam-i386.h
parentfcd6dbac9267c1c06a205ad8bb4bd027c0ace7f7 (diff)
KVM: MMU: prepopulate guest pages after write-protecting
Zdenek reported a bug where a looping "dmsetup status" eventually hangs on SMP guests. The problem is that kvm_mmu_get_page() prepopulates the shadow MMU before write protecting the guest page tables. By doing so, it leaves a window open where the guest can mark a pte as present while the host has shadow cached such pte as "notrap". Accesses to such address will fault in the guest without the host having a chance to fix the situation. Fix by moving the write protection before the pte prefetch. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'include/asm-um/archparam-i386.h')
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