linux-kernel - [PATCH v8 18/18] KVM: SVM: Enable SEV live migration feature implicitly on Incoming VM(s).

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Date:   Tue,  5 May 2020 21:22:21 +0000
From:   Ashish Kalra <Ashish.Kalra@....com>
To:     pbonzini@...hat.com
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        joro@...tes.org, bp@...e.de, Thomas.Lendacky@....com,
        x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        srutherford@...gle.com, rientjes@...gle.com,
        venu.busireddy@...cle.com, brijesh.singh@....com
Subject: [PATCH v8 18/18] KVM: SVM: Enable SEV live migration feature implicitly on Incoming VM(s).

From: Ashish Kalra <ashish.kalra@....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@....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));
 
-- 
2.17.1