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SubjectRe: [PATCH v8 18/18] KVM: SVM: Enable SEV live migration feature implicitly on Incoming VM(s).
Hello Paolo,

On Fri, Dec 04, 2020 at 12:22:48PM +0100, Paolo Bonzini wrote:
> On 05/05/20 23:22, Ashish Kalra wrote:
> > From: Ashish Kalra <ashish.kalra@amd.com>
> >
> > For source VM, live migration feature is enabled explicitly
> > when the guest is booting, for the incoming VM(s) it is implied.
> > This is required for handling A->B->C->... VM migrations case.
> >
> > Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
> > ---
> > arch/x86/kvm/svm/sev.c | 7 +++++++
> > 1 file changed, 7 insertions(+)
> >
> > diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
> > index 6f69c3a47583..ba7c0ebfa1f3 100644
> > --- a/arch/x86/kvm/svm/sev.c
> > +++ b/arch/x86/kvm/svm/sev.c
> > @@ -1592,6 +1592,13 @@ int svm_set_page_enc_bitmap(struct kvm *kvm,
> > if (ret)
> > goto unlock;
> > + /*
> > + * For source VM, live migration feature is enabled
> > + * explicitly when the guest is booting, for the
> > + * incoming VM(s) it is implied.
> > + */
> > + sev_update_migration_flags(kvm, KVM_SEV_LIVE_MIGRATION_ENABLED);
> > +
> > bitmap_copy(sev->page_enc_bmap + BIT_WORD(gfn_start), bitmap,
> > (gfn_end - gfn_start));
> >
>
> I would prefer that userspace does this using KVM_SET_MSR instead.
>
>

Ok.

But, this is for a VM which has already been migrated based on feature
support on host and guest and host negotation and enablement of the live
migration support, so i am assuming that a VM which has already been
migrated can have this support enabled implicitly for further migration.

Thanks,
Ashish

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