From: Paolo Bonzini <pbonzini@redhat.com>
To: Ashish Kalra <ashish.kalra@amd.com>, Andy Lutomirski <luto@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Radim Krcmar <rkrcmar@redhat.com>, Joerg Roedel <joro@8bytes.org>,
Borislav Petkov <bp@suse.de>,
Tom Lendacky <thomas.lendacky@amd.com>,
David Rientjes <rientjes@google.com>, X86 ML <x86@kernel.org>,
kvm list <kvm@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Brijesh Singh <brijesh.singh@amd.com>
Subject: Re: [PATCH 00/12] SEV Live Migration Patchset.
Date: Thu, 19 Mar 2020 14:05:21 +0100 [thread overview]
Message-ID: <101d137c-724a-2b79-f865-e7af8135ca86@redhat.com> (raw)
In-Reply-To: <20200217194959.GA14833@ashkalra_ubuntu_server>
On 17/02/20 20:49, Ashish Kalra wrote:
>> Also, you're making guest-side and host-side changes. What ensures
>> that you don't try to migrate a guest that doesn't support the
>> hypercall for encryption state tracking?
> This is a good question and it is still an open-ended question. There
> are two possibilities here: guest does not have any unencrypted pages
> (for e.g booting 32-bit) and so it does not make any hypercalls, and
> the other possibility is that the guest does not have support for
> the newer hypercall.
>
> In the first case, all the guest pages are then assumed to be
> encrypted and live migration happens as such.
>
> For the second case, we have been discussing this internally,
> and one option is to extend the KVM capabilites/feature bits to check for this ?
You could extend the hypercall to completely block live migration (e.g.
a0=a1=~0, a2=0 to unblock or 1 to block). The KVM_GET_PAGE_ENC_BITMAP
ioctl can also return the blocked/unblocked state.
Paolo
next prev parent reply other threads:[~2020-03-19 13:05 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-13 1:14 [PATCH 00/12] SEV Live Migration Patchset Ashish Kalra
2020-02-13 1:14 ` [PATCH 01/12] KVM: SVM: Add KVM_SEV SEND_START command Ashish Kalra
2020-03-09 21:28 ` Steve Rutherford
2020-03-10 0:19 ` Steve Rutherford
2020-02-13 1:15 ` [PATCH 02/12] KVM: SVM: Add KVM_SEND_UPDATE_DATA command Ashish Kalra
2020-03-10 1:04 ` Steve Rutherford
2020-03-12 1:49 ` Ashish Kalra
2020-02-13 1:16 ` [PATCH 03/12] KVM: SVM: Add KVM_SEV_SEND_FINISH command Ashish Kalra
2020-03-10 1:09 ` Steve Rutherford
2020-02-13 1:16 ` [PATCH 04/12] KVM: SVM: Add support for KVM_SEV_RECEIVE_START command Ashish Kalra
2020-03-10 1:41 ` Steve Rutherford
2020-03-12 0:38 ` Ashish Kalra
2020-03-12 2:55 ` Steve Rutherford
2020-02-13 1:16 ` [PATCH 05/12] KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command Ashish Kalra
2020-02-13 1:16 ` [PATCH 06/12] KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command Ashish Kalra
2020-02-13 1:17 ` [PATCH 07/12] KVM: x86: Add AMD SEV specific Hypercall3 Ashish Kalra
2020-02-13 1:17 ` [PATCH 08/12] KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS hypercall Ashish Kalra
2020-02-20 2:39 ` Steve Rutherford
2020-02-20 5:28 ` Ashish Kalra
2020-02-20 21:21 ` Ashish Kalra
2020-02-13 1:17 ` [PATCH 09/12] KVM: x86: Introduce KVM_GET_PAGE_ENC_BITMAP ioctl Ashish Kalra
2020-02-27 17:57 ` Venu Busireddy
2020-02-27 18:18 ` Venu Busireddy
2020-02-27 19:38 ` Ashish Kalra
2020-02-13 1:18 ` [PATCH 10/12] mm: x86: Invoke hypercall when page encryption status is changed Ashish Kalra
2020-02-13 5:42 ` Andy Lutomirski
2020-02-13 22:28 ` Ashish Kalra
2020-02-14 18:56 ` Andy Lutomirski
2020-02-14 20:36 ` Ashish Kalra
2020-02-20 1:58 ` Steve Rutherford
2020-02-20 2:12 ` Andy Lutomirski
2020-02-20 3:29 ` Steve Rutherford
2020-02-20 15:54 ` Brijesh Singh
2020-02-20 20:43 ` Steve Rutherford
2020-02-20 22:43 ` Brijesh Singh
2020-02-20 23:23 ` Steve Rutherford
2020-02-20 23:40 ` Andy Lutomirski
2020-02-13 1:18 ` [PATCH 11/12] KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl Ashish Kalra
2020-02-13 1:18 ` [PATCH 12/12] KVM: x86: Introduce KVM_PAGE_ENC_BITMAP_RESET ioctl Ashish Kalra
2020-02-13 5:43 ` [PATCH 00/12] SEV Live Migration Patchset Andy Lutomirski
2020-02-13 23:09 ` Ashish Kalra
2020-02-14 18:58 ` Andy Lutomirski
2020-02-17 19:49 ` Ashish Kalra
2020-03-03 1:05 ` Steve Rutherford
2020-03-03 4:42 ` Ashish Kalra
2020-03-19 13:05 ` Paolo Bonzini [this message]
2020-03-19 16:18 ` Ashish Kalra
2020-03-19 16:24 ` Paolo Bonzini
2020-02-14 2:10 ` Brijesh Singh
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