On 27/08/20 19:11, Maxim Levitsky wrote: > + hsave_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); > + if (!hsave_page) > + goto error; > + I think an error here should be just an internal error userspace exit, or a -ENOMEM from KVM_RUN; not a #GP in the guest[1]. However, that's difficult to plug into KVM. Can you instead allocate nested state if KVM_SET_CPUID2 sets the SVM bit? Returning -ENOMEM from KVM_SET_CPUID2 is more likely to be something that userspace copes with. I queued patches 1-5, and 7 for 5.9-rc. Paolo [1] Though in practice an order 0 allocation will never fail
