On 04/29/2010 09:09 PM, Marcelo Tosatti wrote:
You missed quadrant on 4mb large page emulation with shadow (see updated
patch below).
Good catch.
Also for some reason i can't understand the assumption
does not hold for large sptes with TDP, so reverted for now.
It's unrelated to TDP, same issue with shadow. I think the calculation
is correct. For example the 4th spte for a level=2 page will yield
gfn=4*512.
@@ -393,6 +393,27 @@ static void mmu_free_rmap_desc(struct kvm_rmap_desc *rd)
kfree(rd);
}
+static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index)
+{
+ gfn_t gfn;
+
+ if (!sp->role.direct)
+ return sp->gfns[index];
+
+ gfn = sp->gfn + index * (1<< (sp->role.level - 1) * PT64_LEVEL_BITS);
+ gfn += sp->role.quadrant<< PT64_LEVEL_BITS;
PT64_LEVEL_BITS * level
+
+ return gfn;
+}
+
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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