path: root/arch/powerpc/kvm/book3s_hv_rm_mmu.c
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authorBharat Bhushan <r65777@freescale.com>2013-11-15 11:01:13 +0530
committerAlexander Graf <agraf@suse.de>2014-01-09 10:15:04 +0100
commit30a91fe24b7a6475d22d22fb0f772318ed435a1d (patch)
tree0c01cb9668342e5ce0bd15ff3e34e353a922bb92 /arch/powerpc/kvm/book3s_hv_rm_mmu.c
parent595e4f7e697e2e6fb252f6be6a83d5b9460b59a3 (diff)
kvm: booke: clear host tlb reference flag on guest tlb invalidation
On booke, "struct tlbe_ref" contains host tlb mapping information (pfn: for guest-pfn to pfn, flags: attribute associated with this mapping) for a guest tlb entry. So when a guest creates a TLB entry then "struct tlbe_ref" is set to point to valid "pfn" and set attributes in "flags" field of the above said structure. When a guest TLB entry is invalidated then flags field of corresponding "struct tlbe_ref" is updated to point that this is no more valid, also we selectively clear some other attribute bits, example: if E500_TLB_BITMAP was set then we clear E500_TLB_BITMAP, if E500_TLB_TLB0 is set then we clear this. Ideally we should clear complete "flags" as this entry is invalid and does not have anything to re-used. The other part of the problem is that when we use the same entry again then also we do not clear (started doing or-ing etc). So far it was working because the selectively clearing mentioned above actually clears "flags" what was set during TLB mapping. But the problem starts coming when we add more attributes to this then we need to selectively clear them and which is not needed. Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com> Reviewed-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_rm_mmu.c')
0 files changed, 0 insertions, 0 deletions

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