On Tue, May 04, 2010 at 05:50:50AM -0400, Avi Kivity wrote: > On 05/04/2010 12:45 PM, Avi Kivity wrote: > > > > > > Just a silly bug. kvm_pdptr_read() can cause a guest memory read on > > svm, in this case with the mmu lock taken. I'll post something to fix > > it. > > I guess this was not reported because most svm machines have npt, and > this requires npt=0 to trigger. Nonpae paging disables npt, so you were > hit. Interestingly, nsvm makes it more likely to appear, since npt on > i386+pae will need the pdptrs. Hmm, actually it happened on 32 bit with npt enabled. I think this can trigger when mmu_alloc_roots is called for an pae guest because it accidentially tries read the root_gfn from the guest before it figures out that it runs with tdp and omits the gfn read from the guest. I need to touch this for nested-npt and will look into a way improving this. Joerg -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
