Re: [PATCH RFC] KVM: nSVM: Fix L1 state corruption upon return from SMM
From: Paolo Bonzini <pbonzini@redhat.com>
Date: 2021-06-23 09:39:40
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On 23/06/21 09:44, Vitaly Kuznetsov wrote:
- RFC: I'm not 100% sure my 'smart' idea to use currently-unused HSAVE area is that smart. Also, we don't even seem to check that L1 set it up upon nested VMRUN so hypervisors which don't do that may remain broken. A very much needed selftest is also missing.
It's certainly a bit weird, but I guess it counts as smart too. It needs a few more comments, but I think it's a good solution. One could delay the backwards memcpy until vmexit time, but that would require a new flag so it's not worth it for what is a pretty rare and already expensive case. Paolo