On 10/20/21 3:43 PM, Peter Gonda wrote:
On Fri, Oct 15, 2021 at 3:36 PM Tom Lendacky <thomas.lendacky@xxxxxxx> wrote:
On 10/12/21 3:48 PM, Peter Gonda wrote:
For SEV-ES to work with intra host migration the VMSAs, GHCB metadata,
and other SEV-ES info needs to be preserved along with the guest's
memory.
Signed-off-by: Peter Gonda <pgonda@xxxxxxxxxx>
Reviewed-by: Marc Orr <marcorr@xxxxxxxxxx>
Cc: Marc Orr <marcorr@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Dr. David Alan Gilbert <dgilbert@xxxxxxxxxx>
Cc: Brijesh Singh <brijesh.singh@xxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Cc: Wanpeng Li <wanpengli@xxxxxxxxxxx>
Cc: Jim Mattson <jmattson@xxxxxxxxxx>
Cc: Joerg Roedel <joro@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
arch/x86/kvm/svm/sev.c | 48 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 47 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 42ff1ccfe1dc..a486ab08a766 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -1600,6 +1600,46 @@ static void sev_migrate_from(struct kvm_sev_info *dst,
list_replace_init(&src->regions_list, &dst->regions_list);
}
+static int sev_es_migrate_from(struct kvm *dst, struct kvm *src)
+{
+ int i;
+ struct kvm_vcpu *dst_vcpu, *src_vcpu;
+ struct vcpu_svm *dst_svm, *src_svm;
+
+ if (atomic_read(&src->online_vcpus) != atomic_read(&dst->online_vcpus))
+ return -EINVAL;
+
+ kvm_for_each_vcpu(i, src_vcpu, src) {
+ if (!src_vcpu->arch.guest_state_protected)
+ return -EINVAL;
+ }
+
+ kvm_for_each_vcpu(i, src_vcpu, src) {
+ src_svm = to_svm(src_vcpu);
+ dst_vcpu = kvm_get_vcpu(dst, i);
+ dst_svm = to_svm(dst_vcpu);
+
+ /*
+ * Transfer VMSA and GHCB state to the destination. Nullify and
+ * clear source fields as appropriate, the state now belongs to
+ * the destination.
+ */
+ dst_vcpu->vcpu_id = src_vcpu->vcpu_id;
+ memcpy(&dst_svm->sev_es, &src_svm->sev_es,
+ sizeof(dst_svm->sev_es));
+ dst_svm->vmcb->control.ghcb_gpa =
+ src_svm->vmcb->control.ghcb_gpa;
+ dst_svm->vmcb->control.vmsa_pa = __pa(dst_svm->sev_es.vmsa);
+ dst_vcpu->arch.guest_state_protected = true;
Maybe just add a blank line here to separate the setting and clearing
(only if you have to do another version).
+ src_svm->vmcb->control.ghcb_gpa = 0;
+ src_svm->vmcb->control.vmsa_pa = 0;
+ src_vcpu->arch.guest_state_protected = false;
In the previous patch you were clearing some of the fields that are now in
the vcpu_sev_es_state. Did you want to memset that to zero now?
Oops, making that an easy memset was one of the pros of the |sev_es|
refactor. Will fix and add newline in V11.
And totally up to you, but I think you can replace the memcpy() above with
a direct assignment, if you want:
dst_svm->sev_es = src_svm->sev_es;
Thanks,
Tom
Thanks,
Tom
+ }
+ to_kvm_svm(src)->sev_info.es_active = false;
+
+ return 0;
+}
+
