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Re: [Qemu-arm] [PATCH v4 0/7] q35: add negotiable broadcast SMI
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From: |
Michael S. Tsirkin |
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Subject: |
Re: [Qemu-arm] [PATCH v4 0/7] q35: add negotiable broadcast SMI |
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Date: |
Tue, 10 Jan 2017 18:05:10 +0200 |
On Tue, Jan 10, 2017 at 04:23:41PM +0100, Laszlo Ersek wrote:
> On 01/10/17 16:06, Michael S. Tsirkin wrote:
> > On Thu, Dec 01, 2016 at 06:06:17PM +0100, Laszlo Ersek wrote:
> >> * This is version 4 of the series; the last version was at
> >> <http://lists.nongnu.org/archive/html/qemu-devel/2016-11/msg03582.html>.
> >>
> >> This version is practically a rewrite from scratch, seeking to address
> >> the v3 feedback. Here's what the individual patches do:
> >>
> >> - Patch #1 rebases and extends Michael's "writeable fw_cfg blobs"
> >> patch from Feb/March 2016. The changes relative to the original
> >> patch are documented in the commit message (the code changes are
> >> minimal).
> >>
> >> - Patches #2 and #3 turn the FW_CFG_FILE_SLOTS constant into a device
> >> property, and expose the desired number of fw_cfg file slots to
> >> board code. This is meant to address a concern raised by Paolo in
> >> the v2 review
> >>
> >> <http://lists.nongnu.org/archive/html/qemu-devel/2016-11/msg03125.html>,
> >> namely that we're about to run out of FW_CFG_FILE_SLOTS.
> >>
> >> - Patch #4 introduces the "pc-q35-2.9" and "pc-i440fx-2.9" machine
> >> types, which are allowed to take advantage of the new default for
> >> fw_cfg file slots (0x20 rather than 0x10).
> >>
> >> - Patch #5 introduces SMI feature negotiation via fw_cfg, with the
> >> following new files:
> >>
> >> - etc/smi/host-features
> >> - etc/smi/guest-features
> >> - etc/smi/features-ok
> >>
> >> This is supposed to follow Michael's recommendation re: imitating
> >> virtio
> >>
> >> <http://lists.nongnu.org/archive/html/qemu-devel/2016-11/msg03218.html>.
> >>
> >> The guest-features file is freely writeable by the guest (no write
> >> callbacks in fw_cfg), and the feature validation & lockdown occurs
> >> when the guest selects the features-ok file (for reading).
> >>
> >> Board code is allowed to choose the host feature bitmap to
> >> advertise.
> >>
> >> This patch doesn't add any specific SMI features yet.
> >>
> >> - Patch #6 adds the ICH9_LPC_SMI_F_BROADCAST feature.
> >>
> >> - Patch #7 introduces the PCMachineClass.get_smi_host_features method,
> >> and implements it for "pc-q35-2.9" and later. The idea is to tie the
> >> SMI host features to machine types, and let the machine types
> >> calculate their host features with code (i.e., not just a constant).
> >>
> >> In this patch, the "pc-q35-2.9" machine type exposes the
> >> ICH9_LPC_SMI_F_BROADCAST feature iff (smp_cpus == max_cpus), that
> >> is, when VCPU hotplug is not possible. (Also from Paolo's v3
> >> feedback, in
> >>
> >> <http://lists.nongnu.org/archive/html/qemu-devel/2016-11/msg04919.html>.)
> >>
> >> * I've written the OVMF side patches too and tested them together
> >> (including gdb / debug messages for "white box" testing).
> >>
> >> * Note that this version depends on the following PULL req from Michael:
> >>
> >> [Qemu-devel] [PULL 0/5] virtio, vhost, pc: fixes
> >> http://lists.nongnu.org/archive/html/qemu-devel/2016-11/msg05503.html
> >>
> >> In particular on the following patch:
> >> "loader: fix handling of custom address spaces when adding ROM blobs"
> >>
> >> Cc: "Gabriel L. Somlo" <address@hidden>
> >> Cc: "Michael S. Tsirkin" <address@hidden>
> >> Cc: Eduardo Habkost <address@hidden>
> >> Cc: Gerd Hoffmann <address@hidden>
> >> Cc: Igor Mammedov <address@hidden>
> >> Cc: Michael Walle <address@hidden>
> >> Cc: Paolo Bonzini <address@hidden>
> >> Cc: Peter Maydell <address@hidden>
> >> Cc: Shannon Zhao <address@hidden>
> >> Cc: address@hidden
> >>
> >> Thanks
> >> Laszlo
> >
> > So I reviewed fw cfg stuff, looks good to me.
>
> Thank you.
>
> I should note that Igor suggested / requested changes for patches #2 and
> #3; the sub-threads start at
>
> http://lists.nongnu.org/archive/html/qemu-devel/2016-12/msg00695.html
> msg-id: <address@hidden>
>
> http://lists.nongnu.org/archive/html/qemu-devel/2016-12/msg00706.html
> msg-id: <address@hidden>
>
> I was about to rework the patches based on his feedback. Should we
> resume those discussions?
If you both agree, pls go ahead and make these changes.
> > I'd prefer Paolo to review
> > and merge broadcast SMI stuff as appropriate. Paolo, makes sense?
>
> If it helps, I can split the series into two "waves", and deal only with
> fw_cfg first.
>
> Thanks!
> Laszlo
I don't mind either way.
> >
> >
> >> Laszlo Ersek (6):
> >> fw-cfg: turn FW_CFG_FILE_SLOTS into a device property
> >> fw-cfg: expose "file_slots" parameter in fw_cfg_init_io_dma()
> >> hw/i386/pc: introduce 2.9 machine types with 0x20 fw_cfg file slots
> >> hw/isa/lpc_ich9: add SMI feature negotiation via fw_cfg
> >> hw/isa/lpc_ich9: add broadcast SMI feature
> >> hw/i386/pc_q35: advertise broadcast SMI if VCPU hotplug is turned off
> >>
> >> Michael S. Tsirkin (1):
> >> fw-cfg: support writeable blobs
> >>
> >> docs/specs/fw_cfg.txt | 36 +++++++++---
> >> hw/lm32/lm32_hwsetup.h | 2 +-
> >> include/hw/compat.h | 11 ++++
> >> include/hw/i386/ich9.h | 15 ++++-
> >> include/hw/i386/pc.h | 4 ++
> >> include/hw/loader.h | 7 ++-
> >> include/hw/nvram/fw_cfg.h | 5 +-
> >> include/hw/nvram/fw_cfg_keys.h | 7 ++-
> >> hw/arm/virt-acpi-build.c | 2 +-
> >> hw/core/loader.c | 18 +++---
> >> hw/i386/acpi-build.c | 4 +-
> >> hw/i386/pc.c | 3 +-
> >> hw/i386/pc_piix.c | 16 +++++-
> >> hw/i386/pc_q35.c | 37 ++++++++++++-
> >> hw/isa/lpc_ich9.c | 92 +++++++++++++++++++++++++++++-
> >> hw/nvram/fw_cfg.c | 123
> >> +++++++++++++++++++++++++++++++++++------
> >> 16 files changed, 326 insertions(+), 56 deletions(-)
> >>
> >> --
> >> 2.9.2