Messages in this thread | | | From | Bandan Das <> | Subject | Re: [PATCH] KVM: nVMX: Don't return error on nested bitmap memory allocation failure | Date | Wed, 29 Apr 2015 12:08:46 -0400 |
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Paolo Bonzini <pbonzini@redhat.com> writes:
> On 29/04/2015 15:05, Jan Kiszka wrote: >> > Yeah... I hear you. Ok, let me put it this way - Assume that we can >> > defer this allocation up until the point that the nested subsystem is >> > actually used i.e L1 tries running a guest and we try to allocate this >> > area. If get_free_page() failed in that case, would we still want to >> > kill L1 too ? I guess no. >> >> We could block the hypervisor thread on the allocation, just like it >> would block on faults for swapped out pages or new ones that have to be >> reclaimed from the page cache first.
So, block on a failure hoping that eventually it will succeed ?
> In that case we should avoid making the allocation GFP_ATOMIC to begin with. > > If a GFP_KERNEL allocation failed, returning -ENOMEM from KVM_RUN (which > practically means killing the guest) would actually be a very real > possibility.
Sorry Paolo, I missed your point. Isn't the allocation already GFP_KERNEL ?
> Paolo
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