| Date | Sun, 15 Sep 2019 18:55:16 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH 4.19 042/190] KVM: x86: hyperv: keep track of mismatched VP indexes |
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On Fri 2019-09-13 14:04:57, Greg Kroah-Hartman wrote: > [ Upstream commit 87ee613d076351950b74383215437f841ebbeb75 ] > > In most common cases VP index of a vcpu matches its vcpu index. Userspace is, however, > free to set any mapping it wishes and we need to account for that when we need to find a > vCPU with a particular VP index. To keep search algorithms optimal in both cases > introduce 'num_mismatched_vp_indexes' counter showing how many vCPUs with mismatching VP > index we have. In case the counter is zero we can assume vp_index == vcpu_idx.
I don't see why this is stable material.
> u64 hv_reenlightenment_control; > u64 hv_tsc_emulation_control; > u64 hv_tsc_emulation_status; > + > + /* How many vCPUs have VP index != vCPU index */ > + atomic_t num_mismatched_vp_indexes; > }; >
It adds a write-only variable ...
Best regards, Pavel
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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