From: Paolo Bonzini <pbonzini@redhat.com>
To: "Kinney, Michael D" <michael.d.kinney@intel.com>,
Laszlo Ersek <lersek@redhat.com>,
"rfc@edk2.groups.io" <rfc@edk2.groups.io>,
"Yao, Jiewen" <jiewen.yao@intel.com>
Cc: "Chen, Yingwen" <yingwen.chen@intel.com>,
"devel@edk2.groups.io" <devel@edk2.groups.io>,
Phillip Goerl <phillip.goerl@oracle.com>,
qemu devel list <qemu-devel@nongnu.org>,
Alex Williamson <alex.williamson@redhat.com>,
"Nakajima, Jun" <jun.nakajima@intel.com>,
Igor Mammedov <imammedo@redhat.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Joao Marcal Lemos Martins <joao.m.martins@oracle.com>
Subject: Re: [Qemu-devel] [edk2-rfc] [edk2-devel] CPU hotplug using SMM with QEMU+OVMF
Date: Fri, 23 Aug 2019 01:11:51 +0200 [thread overview]
Message-ID: <3661c0c5-3da4-1453-a66a-3e4d4022e876@redhat.com> (raw)
In-Reply-To: <E92EE9817A31E24EB0585FDF735412F5B9DA218F@ORSMSX113.amr.corp.intel.com>
On 23/08/19 00:32, Kinney, Michael D wrote:
> Paolo,
>
> It is my understanding that real HW hot plug uses the SDM defined
> methods. Meaning the initial SMI is to 3000:8000 and they rebase
> to TSEG in the first SMI. They must have chipset specific methods
> to protect 3000:8000 from DMA.
It would be great if you could check.
> Can we add a chipset feature to prevent DMA to 64KB range from
> 0x30000-0x3FFFF and the UEFI Memory Map and ACPI content can be
> updated so the Guest OS knows to not use that range for DMA?
If real hardware does it at the chipset level, we will probably use
Igor's suggestion of aliasing A-seg to 3000:0000. Before starting the
new CPU, the SMI handler can prepare the SMBASE relocation trampoline at
A000:8000 and the hot-plugged CPU will find it at 3000:8000 when it
receives the initial SMI. Because this is backed by RAM at
0xA0000-0xAFFFF, DMA cannot access it and would still go through to RAM
at 0x30000.
Paolo
next prev parent reply other threads:[~2019-08-22 23:15 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-13 14:16 [Qemu-devel] CPU hotplug using SMM with QEMU+OVMF Laszlo Ersek
2019-08-13 16:09 ` Laszlo Ersek
2019-08-13 16:18 ` Laszlo Ersek
2019-08-14 13:20 ` Yao, Jiewen
2019-08-14 14:04 ` Paolo Bonzini
2019-08-15 9:55 ` Yao, Jiewen
2019-08-15 16:04 ` Paolo Bonzini
2019-08-15 15:00 ` [Qemu-devel] [edk2-devel] " Laszlo Ersek
2019-08-15 16:16 ` Igor Mammedov
2019-08-15 16:21 ` Paolo Bonzini
2019-08-16 2:46 ` Yao, Jiewen
2019-08-16 7:20 ` Paolo Bonzini
2019-08-16 7:49 ` Yao, Jiewen
2019-08-16 20:15 ` Laszlo Ersek
2019-08-16 22:19 ` Alex Williamson
2019-08-17 0:20 ` Yao, Jiewen
2019-08-18 19:50 ` Paolo Bonzini
2019-08-18 23:00 ` Yao, Jiewen
2019-08-19 14:10 ` Paolo Bonzini
2019-08-21 12:07 ` Laszlo Ersek
[not found] ` <E92EE9817A31E24EB0585FDF735412F5B9D9C671@ORSMSX113.amr.corp.intel.com>
2019-08-21 17:05 ` [Qemu-devel] [edk2-rfc] " Paolo Bonzini
[not found] ` <E92EE9817A31E24EB0585FDF735412F5B9D9D74A@ORSMSX113.amr.corp.intel.com>
2019-08-21 17:39 ` Paolo Bonzini
2019-08-21 20:17 ` Kinney, Michael D
2019-08-22 6:18 ` Paolo Bonzini
2019-08-22 18:29 ` Laszlo Ersek
2019-08-22 18:51 ` Paolo Bonzini
2019-08-23 14:53 ` Laszlo Ersek
2019-08-22 20:13 ` Kinney, Michael D
2019-08-22 17:59 ` Laszlo Ersek
2019-08-22 18:43 ` Paolo Bonzini
2019-08-22 20:06 ` Kinney, Michael D
2019-08-22 22:18 ` Paolo Bonzini
2019-08-22 22:32 ` Kinney, Michael D
2019-08-22 23:11 ` Paolo Bonzini [this message]
2019-08-23 1:02 ` Kinney, Michael D
2019-08-23 5:00 ` Yao, Jiewen
2019-08-23 15:25 ` Kinney, Michael D
2019-08-24 1:48 ` Yao, Jiewen
2019-08-27 18:31 ` Igor Mammedov
2019-08-29 17:01 ` Laszlo Ersek
2019-08-30 14:48 ` Igor Mammedov
2019-08-30 18:46 ` Laszlo Ersek
2019-09-02 8:45 ` Igor Mammedov
2019-09-02 19:09 ` Laszlo Ersek
2019-09-03 14:53 ` Igor Mammedov
2019-09-03 17:20 ` Laszlo Ersek
2019-09-04 9:52 ` Igor Mammedov
2019-09-05 13:08 ` Laszlo Ersek
2019-09-05 15:45 ` Igor Mammedov
2019-09-05 15:49 ` [Qemu-devel] [PATCH] q35: lpc: allow to lock down 128K RAM at default SMBASE address Igor Mammedov
2019-09-09 19:15 ` Laszlo Ersek
2019-09-09 19:20 ` Laszlo Ersek
2019-09-10 15:58 ` Igor Mammedov
2019-09-11 17:30 ` Laszlo Ersek
2019-09-17 13:11 ` [Qemu-devel] [edk2-devel] " Igor Mammedov
2019-08-26 15:30 ` [Qemu-devel] [edk2-rfc] [edk2-devel] CPU hotplug using SMM with QEMU+OVMF Laszlo Ersek
2019-08-27 16:23 ` Igor Mammedov
2019-08-27 20:11 ` Laszlo Ersek
2019-08-28 12:01 ` Igor Mammedov
2019-08-29 16:25 ` Laszlo Ersek
2019-08-30 13:49 ` Igor Mammedov
2019-08-22 17:53 ` Laszlo Ersek
2019-08-16 20:00 ` [Qemu-devel] " Laszlo Ersek
2019-08-15 16:07 ` [Qemu-devel] " Igor Mammedov
2019-08-15 16:24 ` Paolo Bonzini
2019-08-16 7:42 ` Igor Mammedov
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