Marcelo Tosatti wrote: > On Thu, Apr 29, 2010 at 09:43:40PM +0300, Avi Kivity wrote: >> 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. > > Under testing i see sp at level 2, with sp->gfn == 4096, mmu_set_spte > setting index 8 to gfn 4096 (whereas kvm_mmu_page_get_gfn returns 4096 + > 8*512). > > Lai, can you please take a look at it? You should see the > kvm_mmu_page_set_gfn BUG_ON by using -mem-path on hugetlbfs. >
Could you tell me how you test it? It will be better if I follow your test steps. I also hit the kvm_mmu_page_set_gfn BUG_ON, It is because FNAME(fetch)() set sp->gfn wrong. The patch: [PATCH] kvm: calculate correct gfn for small host pages which emulates large guest pages fix it. I can not hit kvm_mmu_page_set_gfn BUG_ON after this patch also applied. So could you tell me your test steps: The host: ept/npt enabled? 64bit? testing codes in host? The guest: OS? PAE? 32bit? 64bit? testing codes in guest? Lai -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
