On 05/05/20 23:22, Ashish Kalra wrote:
From: Ashish Kalra <ashish.kalra@xxxxxxx>
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@xxxxxxx>
---
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.
Paolo
