Messages in this thread | | | Date | Tue, 14 Dec 2021 11:16:12 +0100 | Subject | Re: [PATCH 09/19] kvm: x86: Prepare reallocation check | From | Paolo Bonzini <> |
| |
On 12/14/21 08:06, Tian, Kevin wrote: >> - if (dynamic_enabled & ~guest_fpu->user_perm) != 0, then this is a >> userspace error and you can #GP the guest without any issue. Userspace >> is buggy > > Is it a general guideline that an error caused by emulation itself (e.g. > due to no memory) can be reflected into the guest as #GP, even > when from guest p.o.v there is nothing wrong with its setting?
No memory is a tricky one, if possible it should propagate -ENOMEM up to KVM_RUN or KVM_SET_MSR. But it's basically an impossible case anyway, because even with 8K TILEDATA we're within the limit of PAGE_ALLOC_COSTLY_ORDER.
So, since it's not easy to do it right now, we can look at it later.
Paolo
| |