QEMU-Devel Archive on lore.kernel.org
 help / color / Atom feed
From: Markus Armbruster <armbru@redhat.com>
To: "Philippe Mathieu-Daudé" <philmd@redhat.com>
Cc: 'Eduardo Habkost' <ehabkost@redhat.com>,
	'Jason Andryuk' <jandryuk@gmail.com>,
	'Paul Durrant' <pdurrant@amazon.com>,
	paul@xen.org, qemu-devel@nongnu.org,
	"'Michael S. Tsirkin'" <mst@redhat.com>,
	'Paolo Bonzini' <pbonzini@redhat.com>,
	xen-devel@lists.xenproject.org,
	'Richard Henderson' <rth@twiddle.net>
Subject: Re: [PATCH 2/2] xen: cleanup unrealized flash devices
Date: Wed, 01 Jul 2020 07:59:01 +0200
Message-ID: <877dvndbdm.fsf@dusky.pond.sub.org> (raw)
In-Reply-To: <9e591254-d215-d5af-38d2-fd5b65f84a43@redhat.com> ("Philippe =?utf-8?Q?Mathieu-Daud=C3=A9=22's?= message of "Tue, 30 Jun 2020 19:27:22 +0200")

Philippe Mathieu-Daudé <philmd@redhat.com> writes:

> On 6/30/20 5:44 PM, Paul Durrant wrote:
>>> -----Original Message-----
>>> From: Philippe Mathieu-Daudé <philmd@redhat.com>
>>> Sent: 30 June 2020 16:26
>>> To: Paul Durrant <paul@xen.org>; xen-devel@lists.xenproject.org; qemu-devel@nongnu.org
>>> Cc: Eduardo Habkost <ehabkost@redhat.com>; Michael S. Tsirkin <mst@redhat.com>; Paul Durrant
>>> <pdurrant@amazon.com>; Jason Andryuk <jandryuk@gmail.com>; Paolo Bonzini <pbonzini@redhat.com>;
>>> Richard Henderson <rth@twiddle.net>
>>> Subject: Re: [PATCH 2/2] xen: cleanup unrealized flash devices
>>>
>>> On 6/24/20 2:18 PM, Paul Durrant wrote:
>>>> From: Paul Durrant <pdurrant@amazon.com>
>>>>
>>>> The generic pc_machine_initfn() calls pc_system_flash_create() which creates
>>>> 'system.flash0' and 'system.flash1' devices. These devices are then realized
>>>> by pc_system_flash_map() which is called from pc_system_firmware_init() which
>>>> itself is called via pc_memory_init(). The latter however is not called when
>>>> xen_enable() is true and hence the following assertion fails:
>>>>
>>>> qemu-system-i386: hw/core/qdev.c:439: qdev_assert_realized_properly:
>>>> Assertion `dev->realized' failed
>>>>
>>>> These flash devices are unneeded when using Xen so this patch avoids the
>>>> assertion by simply removing them using pc_system_flash_cleanup_unused().
>>>>
>>>> Reported-by: Jason Andryuk <jandryuk@gmail.com>
>>>> Fixes: ebc29e1beab0 ("pc: Support firmware configuration with -blockdev")
>>>> Signed-off-by: Paul Durrant <pdurrant@amazon.com>
>>>> Tested-by: Jason Andryuk <jandryuk@gmail.com>
>>>> ---
>>>> Cc: Paolo Bonzini <pbonzini@redhat.com>
>>>> Cc: Richard Henderson <rth@twiddle.net>
>>>> Cc: Eduardo Habkost <ehabkost@redhat.com>
>>>> Cc: "Michael S. Tsirkin" <mst@redhat.com>
>>>> Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
>>>> ---
>>>>  hw/i386/pc_piix.c    | 9 ++++++---
>>>>  hw/i386/pc_sysfw.c   | 2 +-
>>>>  include/hw/i386/pc.h | 1 +
>>>>  3 files changed, 8 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
>>>> index 1497d0e4ae..977d40afb8 100644
>>>> --- a/hw/i386/pc_piix.c
>>>> +++ b/hw/i386/pc_piix.c
>>>> @@ -186,9 +186,12 @@ static void pc_init1(MachineState *machine,
>>>>      if (!xen_enabled()) {
>>>>          pc_memory_init(pcms, system_memory,
>>>>                         rom_memory, &ram_memory);
>>>> -    } else if (machine->kernel_filename != NULL) {
>>>> -        /* For xen HVM direct kernel boot, load linux here */
>>>> -        xen_load_linux(pcms);
>>>> +    } else {
>>>> +        pc_system_flash_cleanup_unused(pcms);
>>>
>>> TIL pc_system_flash_cleanup_unused().
>>>
>>> What about restricting at the source?
>>>
>> 
>> And leave the devices in place? They are not relevant for Xen, so why not clean up?
>
> No, I meant to not create them in the first place, instead of
> create+destroy.

Better.  Opinion, not demand :)

[...]



  reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-24 12:18 [PATCH 0/2] fix assertion failures when using Xen Paul Durrant
2020-06-24 12:18 ` [PATCH 1/2] xen: fix legacy 'xen-sysdev' and 'xen-backend' bus types Paul Durrant
2020-06-30 15:19   ` Philippe Mathieu-Daudé
2020-06-24 12:18 ` [PATCH 2/2] xen: cleanup unrealized flash devices Paul Durrant
2020-06-30 15:08   ` Anthony PERARD
2020-06-30 15:17     ` Paul Durrant
2020-07-01  5:56     ` Markus Armbruster
2020-06-30 15:25   ` Philippe Mathieu-Daudé
2020-06-30 15:44     ` Paul Durrant
2020-06-30 17:27       ` Philippe Mathieu-Daudé
2020-07-01  5:59         ` Markus Armbruster [this message]
2020-07-01  7:03         ` Paul Durrant
2020-07-01 12:25           ` Jason Andryuk
2020-07-01 12:40             ` Philippe Mathieu-Daudé
2020-07-01 12:55               ` Philippe Mathieu-Daudé
2020-07-01 14:59                 ` Jason Andryuk
2020-07-01 15:10                   ` Philippe Mathieu-Daudé
2020-07-02  3:55             ` Markus Armbruster

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=877dvndbdm.fsf@dusky.pond.sub.org \
    --to=armbru@redhat.com \
    --cc=ehabkost@redhat.com \
    --cc=jandryuk@gmail.com \
    --cc=mst@redhat.com \
    --cc=paul@xen.org \
    --cc=pbonzini@redhat.com \
    --cc=pdurrant@amazon.com \
    --cc=philmd@redhat.com \
    --cc=qemu-devel@nongnu.org \
    --cc=rth@twiddle.net \
    --cc=xen-devel@lists.xenproject.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

QEMU-Devel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/qemu-devel/0 qemu-devel/git/0.git
	git clone --mirror https://lore.kernel.org/qemu-devel/1 qemu-devel/git/1.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 qemu-devel qemu-devel/ https://lore.kernel.org/qemu-devel \
		qemu-devel@nongnu.org
	public-inbox-index qemu-devel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.nongnu.qemu-devel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git