Messages in this thread | | | Date | Wed, 28 Dec 2022 14:21:51 +0100 | From | Paolo Bonzini <> | Subject | Re: [PATCH] KVM: x86: fix deadlock for KVM_XEN_EVTCHN_RESET |
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On 12/28/22 12:55, Woodhouse, David wrote: > > IIRC the send_port and type aren't used from hcall_send so we could > stick those in a union with a 'next' pointer and use it to build a list > instead of having to allocate the array (pathological worst case 32KiB).
Yeah I thought about using a list. The union is doable as you say, but I wasn't sure if things were going to change in kvm_xen_evtchn_send later.
And the worst case is order 3, which is within PAGE_ALLOC_COSTLY_ORDER, so I decided to go with the array which only consumes memory on reset rather than always; it's much more likely that the array will be smaller than a page.
Paolo
> Or if the union is a bit icky, we could just add the 'next' pointer > unconditionally. >
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