Messages in this thread | | | Subject | Re: [PATCH Part2 RFC v4 25/40] KVM: SVM: Reclaim the guest pages when SEV-SNP VM terminates | From | Brijesh Singh <> | Date | Tue, 20 Jul 2021 13:23:34 -0500 |
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On 7/20/21 11:40 AM, Sean Christopherson wrote: > On Mon, Jul 19, 2021, Brijesh Singh wrote: >> >> On 7/19/21 2:03 PM, Sean Christopherson wrote: >>> On Mon, Jul 19, 2021, Brijesh Singh wrote: >>> Ah, not firmwrare, gotcha. But we can still use a helper, e.g. an inner >>> double-underscore helper, __rmp_make_private(). >> >> In that case we are basically passing the all the fields defined in the >> 'struct rmpupdate' as individual arguments. > > Yes, but (a) not _all_ fields, (b) it would allow hiding "struct rmpupdate", and > (c) this is much friendlier to readers: > > __rmp_make_private(pfn, gpa, PG_LEVEL_4K, svm->asid, true); > > than: > > rmpupdate(&rmpupdate); >
Ok.
> For the former, I can see in a single line of code that KVM is creating a 4k > private, immutable guest page. With the latter, I need to go hunt down all code > that modifies rmpupdate to understand what the code is doing. > >> How about something like this: >> >> * core kernel exports the rmpupdate() >> * the include/linux/sev.h header file defines the helper functions >> >> int rmp_make_private(u64 pfn, u64 gpa, int psize, int asid) > > I think we'll want s/psize/level, i.e. make it more obvious clear that the input > is PG_LEVEL_*. >
ok, I will stick to x86 PG_LEVEL_*
thanks
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