From: Paolo Bonzini <pbonzini@redhat.com>
To: Ashish Kalra <ashish.kalra@amd.com>
Cc: qemu-devel@nongnu.org, thomas.lendacky@amd.com,
brijesh.singh@amd.com, ehabkost@redhat.com, mst@redhat.com,
richard.henderson@linaro.org, jejb@linux.ibm.com, tobin@ibm.com,
dovmurik@linux.vnet.ibm.com, frankeh@us.ibm.com,
dgilbert@redhat.com, kvm@vger.kernel.org
Subject: Re: [RFC PATCH 00/13] Add support for Mirror VM.
Date: Mon, 16 Aug 2021 16:58:02 +0200 [thread overview]
Message-ID: <b25a1cf9-5675-99da-7dd6-302b04cc7bbc@redhat.com> (raw)
In-Reply-To: <20210816144413.GA29881@ashkalra_ubuntu_server>
On 16/08/21 16:44, Ashish Kalra wrote:
> I think that once the mirror VM starts booting and running the UEFI
> code, it might be only during the PEI or DXE phase where it will
> start actually running the MH code, so mirror VM probably still need
> to handles KVM_EXIT_IO when SEC phase does I/O, I can see PIC
> accesses and Debug Agent initialization stuff in SEC startup code.
That may be a design of the migration helper code that you were working
with, but it's not necessary.
The migration helper can be just some code that the guest "donates" to
the host. The entry point need not be the usual 0xfffffff0; it can be
booted directly in 64-bit mode with a CR3 and EIP that the guest
provides to the guest---for example with a UEFI GUIDed structure.
In fact, the migration helper can run even before the guest has booted
and while the guest is paused, so I don't think that it is possible to
make use of any device emulation code in it.
Paolo
next prev parent reply other threads:[~2021-08-16 14:58 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-16 13:25 [RFC PATCH 00/13] Add support for Mirror VM Ashish Kalra
2021-08-16 13:26 ` [RFC PATCH 01/13] machine: Add mirrorvcpus=N suboption to -smp Ashish Kalra
2021-08-16 21:23 ` Eric Blake
2021-08-16 13:27 ` [RFC PATCH 02/13] hw/boards: Add mirror_vcpu flag to CPUArchId Ashish Kalra
2021-08-16 13:27 ` [RFC PATCH 03/13] hw/i386: Mark mirror vcpus in possible_cpus Ashish Kalra
2021-08-16 13:27 ` [RFC PATCH 04/13] hw/acpi: Don't include mirror vcpus in ACPI tables Ashish Kalra
2021-08-16 13:28 ` [RFC PATCH 05/13] cpu: Add boolean mirror_vcpu field to CPUState Ashish Kalra
2021-08-16 13:28 ` [RFC PATCH 06/13] hw/i386: Set CPUState.mirror_vcpu=true for mirror vcpus Ashish Kalra
2021-08-16 13:29 ` [RFC PATCH 07/13] kvm: Add Mirror VM ioctl and enable cap interfaces Ashish Kalra
2021-08-16 13:29 ` [RFC PATCH 08/13] kvm: Add Mirror VM support Ashish Kalra
2021-08-16 13:29 ` [RFC PATCH 09/13] kvm: create Mirror VM and share primary VM's encryption context Ashish Kalra
2021-08-16 13:30 ` [RFC PATCH 10/13] softmmu/cpu: Skip mirror vcpu's for pause, resume and synchronization Ashish Kalra
2021-08-16 13:30 ` [RFC PATCH 11/13] kvm/apic: Disable in-kernel APIC support for mirror vcpu's Ashish Kalra
2021-08-16 13:31 ` [RFC PATCH 12/13] hw/acpi: disable modern CPU hotplug interface " Ashish Kalra
2021-08-16 13:31 ` [RFC PATCH 13/13] hw/i386/pc: reduce fw_cfg boot cpu count taking into account " Ashish Kalra
2021-08-16 14:01 ` [RFC PATCH 00/13] Add support for Mirror VM Claudio Fontana
2021-08-16 14:15 ` Paolo Bonzini
2021-08-16 14:23 ` Daniel P. Berrangé
2021-08-16 15:00 ` Paolo Bonzini
2021-08-16 15:16 ` Daniel P. Berrangé
2021-08-16 15:35 ` Paolo Bonzini
2021-08-16 14:44 ` Ashish Kalra
2021-08-16 14:58 ` Paolo Bonzini [this message]
2021-08-16 15:13 ` Ashish Kalra
2021-08-16 15:38 ` Paolo Bonzini
2021-08-16 15:48 ` Dr. David Alan Gilbert
2021-08-18 10:31 ` Ashish Kalra
2021-08-18 11:25 ` James Bottomley
2021-08-18 15:31 ` Dr. David Alan Gilbert
2021-08-18 15:35 ` James Bottomley
2021-08-18 15:43 ` Dr. David Alan Gilbert
2021-08-18 16:28 ` James Bottomley
2021-08-18 17:30 ` Dr. David Alan Gilbert
2021-08-18 18:51 ` James Bottomley
2021-08-16 17:23 ` Dr. David Alan Gilbert
2021-08-16 23:53 ` Steve Rutherford
2021-08-17 7:05 ` Michael S. Tsirkin
2021-08-17 8:38 ` Dr. David Alan Gilbert
2021-08-17 14:08 ` Ashish Kalra
2021-08-17 16:32 ` Paolo Bonzini
2021-08-17 20:50 ` Tobin Feldman-Fitzthum
2021-08-17 22:04 ` Steve Rutherford
2021-08-18 15:32 ` Tobin Feldman-Fitzthum
2021-08-18 19:04 ` Dr. David Alan Gilbert
2021-08-18 21:42 ` Tobin Feldman-Fitzthum
2021-08-19 8:22 ` Dr. David Alan Gilbert
2021-08-19 14:06 ` James Bottomley
2021-08-19 14:28 ` Dr. David Alan Gilbert
2021-08-19 22:10 ` James Bottomley
2021-08-23 12:26 ` Dr. David Alan Gilbert
2021-08-23 16:28 ` Tobin Feldman-Fitzthum
2021-08-19 14:07 ` Tobin Feldman-Fitzthum
2021-08-17 23:20 ` Paolo Bonzini
2021-08-17 21:54 ` Steve Rutherford
2021-08-17 22:37 ` Paolo Bonzini
2021-08-17 22:57 ` James Bottomley
2021-08-17 23:10 ` Steve Rutherford
2021-08-18 2:49 ` James Bottomley
2021-08-18 14:06 ` Ashish Kalra
2021-08-18 17:07 ` Ashish Kalra
2021-08-16 15:07 Tobin Feldman-Fitzthum
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