From: Ashish Kalra <ashish.kalra@amd.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
joro@8bytes.org, bp@suse.de, Thomas.Lendacky@amd.com,
x86@kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, srutherford@google.com,
rientjes@google.com, venu.busireddy@oracle.com,
brijesh.singh@amd.com
Subject: Re: [PATCH v8 18/18] KVM: SVM: Enable SEV live migration feature implicitly on Incoming VM(s).
Date: Fri, 4 Dec 2020 21:46:56 +0000 [thread overview]
Message-ID: <20201204214656.GC1424@ashkalra_ubuntu_server> (raw)
In-Reply-To: <7a3e57c5-8a8c-30dc-4414-cd46b201eed3@redhat.com>
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
next prev parent reply other threads:[~2020-12-04 21:47 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-05 21:13 [PATCH v8 00/18] Add AMD SEV guest live migration support Ashish Kalra
2020-05-05 21:14 ` [PATCH v8 01/18] KVM: SVM: Add KVM_SEV SEND_START command Ashish Kalra
2020-05-05 21:14 ` [PATCH v8 02/18] KVM: SVM: Add KVM_SEND_UPDATE_DATA command Ashish Kalra
2020-05-05 22:48 ` Venu Busireddy
2020-05-05 21:15 ` [PATCH v8 03/18] KVM: SVM: Add KVM_SEV_SEND_FINISH command Ashish Kalra
2020-05-05 22:51 ` Venu Busireddy
2020-05-05 21:15 ` [PATCH v8 04/18] KVM: SVM: Add support for KVM_SEV_RECEIVE_START command Ashish Kalra
2020-05-05 22:52 ` Venu Busireddy
2020-05-05 21:15 ` [PATCH v8 05/18] KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command Ashish Kalra
2020-05-05 21:16 ` [PATCH v8 06/18] KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command Ashish Kalra
2020-05-05 21:16 ` [PATCH v8 07/18] KVM: x86: Add AMD SEV specific Hypercall3 Ashish Kalra
2020-05-05 21:17 ` [PATCH v8 08/18] KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS hypercall Ashish Kalra
2020-05-30 2:05 ` Steve Rutherford
2020-05-05 21:17 ` [PATCH v8 09/18] KVM: x86: Introduce KVM_GET_PAGE_ENC_BITMAP ioctl Ashish Kalra
2020-05-30 2:05 ` Steve Rutherford
2020-05-05 21:17 ` [PATCH v8 10/18] mm: x86: Invoke hypercall when page encryption status is changed Ashish Kalra
2020-05-30 2:06 ` Steve Rutherford
2020-05-05 21:18 ` [PATCH v8 11/18] KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl Ashish Kalra
2020-05-30 2:06 ` Steve Rutherford
2020-05-05 21:18 ` [PATCH v8 12/18] KVM: SVM: Add support for static allocation of unified Page Encryption Bitmap Ashish Kalra
2020-05-30 2:07 ` Steve Rutherford
2020-05-30 5:49 ` Ashish Kalra
2020-12-04 11:08 ` Paolo Bonzini
2020-12-04 21:38 ` Ashish Kalra
2020-12-06 10:19 ` Paolo Bonzini
2020-05-05 21:19 ` [PATCH v8 13/18] KVM: x86: Introduce new KVM_FEATURE_SEV_LIVE_MIGRATION feature & Custom MSR Ashish Kalra
2020-05-30 2:07 ` Steve Rutherford
2020-12-04 11:20 ` Paolo Bonzini
2020-12-04 16:48 ` Sean Christopherson
2020-12-04 17:08 ` Ashish Kalra
2020-12-04 17:23 ` Sean Christopherson
2020-12-06 10:57 ` Paolo Bonzini
2020-12-06 14:09 ` Kalra, Ashish
2020-12-04 18:06 ` Ashish Kalra
2020-12-04 18:41 ` Sean Christopherson
2020-12-04 18:48 ` Kalra, Ashish
2020-12-04 19:02 ` Tom Lendacky
2020-12-04 21:42 ` Ashish Kalra
2020-05-05 21:20 ` [PATCH v8 14/18] EFI: Introduce the new AMD Memory Encryption GUID Ashish Kalra
2020-05-30 2:07 ` Steve Rutherford
2020-05-30 5:51 ` Ashish Kalra
2020-05-05 21:20 ` [PATCH v8 15/18] KVM: x86: Add guest support for detecting and enabling SEV Live Migration feature Ashish Kalra
2020-05-30 2:08 ` Steve Rutherford
2020-05-05 21:20 ` [PATCH v8 16/18] KVM: x86: Mark _bss_decrypted section variables as decrypted in page encryption bitmap Ashish Kalra
2020-05-30 2:08 ` Steve Rutherford
2020-05-05 21:21 ` [PATCH v8 17/18] KVM: x86: Add kexec support for SEV Live Migration Ashish Kalra
2020-05-30 2:08 ` Steve Rutherford
2020-05-05 21:22 ` [PATCH v8 18/18] KVM: SVM: Enable SEV live migration feature implicitly on Incoming VM(s) Ashish Kalra
2020-05-30 2:09 ` Steve Rutherford
2020-12-04 11:11 ` Paolo Bonzini
2020-12-04 11:22 ` Paolo Bonzini
2020-12-04 21:46 ` Ashish Kalra [this message]
2020-12-06 10:18 ` Paolo Bonzini
2020-05-18 19:07 ` [PATCH v8 00/18] Add AMD SEV guest live migration support Ashish Kalra
2020-06-01 20:02 ` Steve Rutherford
2020-06-03 22:14 ` Ashish Kalra
2020-08-05 18:29 ` Steve Rutherford
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