From: Avi Kivity <avi@redhat.com>
To: Blue Swirl <blauwirbel@gmail.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>,
Jan Kiszka <jan.kiszka@web.de>,
qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset
Date: Sun, 02 Oct 2011 18:56:26 +0200 [thread overview]
Message-ID: <4E8897BA.2060400@redhat.com> (raw)
In-Reply-To: <CAAu8pHt3zGodeLMNtOcbgbCi8VWbkiV6wyp2heE0p7yiOdaY7Q@mail.gmail.com>
On 10/01/2011 10:31 AM, Blue Swirl wrote:
> Therefore it is incorrect to perform any qemu_irq activities during
> reset (also VM restore like the original example), don't you agree?
It is not incorrect. Real hardware updates outputs on RESET assertion,
and real hardware deals with devices entering reset at different times
(due to signal propagation delay or slow devices).
> If we continued to reset all the devices (call the reset handlers
> multiple times), eventually machine state should stabilize (equivalent
> of real HW with nice long reset pulses), but on QEMU the reset event
> is infinitely short so we have to be more careful.
calling qemu_irq_pulse(reset) simulates a reset signal of any length
(since nothing happens between the two edges).
> Actually I don't think that even a two-phase reset with qemu_irq or
> Pin activity on the second phase would produce correct results in
> every obscure case. Though this may be detectable since the start
> state would be known.
The output signals have to stabilize before the second edge of the reset
signal.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2011-10-02 16:56 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-28 11:00 [Qemu-devel] [PATCH 00/22] Rework i8259 and PC interrupt models Jan Kiszka
2011-09-28 11:00 ` [Qemu-devel] [PATCH 01/22] pc: Drop useless test from isa_irq_handler Jan Kiszka
2011-09-28 11:00 ` [Qemu-devel] [PATCH 02/22] pc: Generalize ISA IRQs to GSIs Jan Kiszka
2011-09-28 11:00 ` [Qemu-devel] [PATCH 03/22] pc: Convert GSIState::i8259_irq into array Jan Kiszka
2011-09-28 11:00 ` [Qemu-devel] [PATCH 04/22] pc: Fix and clean up PIC-to-APIC IRQ path Jan Kiszka
2011-09-28 11:00 ` [Qemu-devel] [PATCH 05/22] i8259: Remove premature inline function attributes Jan Kiszka
2011-09-28 11:00 ` [Qemu-devel] [PATCH 06/22] i8259: Drop obsolete prototypes Jan Kiszka
2011-09-28 11:00 ` [Qemu-devel] [PATCH 07/22] i8259: Move pic_set_irq1 after pic_update_irq Jan Kiszka
2011-09-28 11:00 ` [Qemu-devel] [PATCH 08/22] i8239: Introduce per-PIC output interrupt Jan Kiszka
2011-09-28 11:00 ` [Qemu-devel] [PATCH 09/22] i8259: Do not update IRQ output after spurious pic_poll_read Jan Kiszka
2011-09-28 11:00 ` [Qemu-devel] [PATCH 10/22] i8259: Reorder intack in pic_read_irq Jan Kiszka
2011-09-28 11:00 ` [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset Jan Kiszka
2011-09-28 18:01 ` Blue Swirl
2011-09-28 18:09 ` Peter Maydell
2011-09-28 18:42 ` Blue Swirl
2011-09-28 21:38 ` Peter Maydell
2011-09-29 19:35 ` Blue Swirl
2011-09-28 21:18 ` Jan Kiszka
2011-09-29 19:45 ` Blue Swirl
2011-09-30 6:47 ` Jan Kiszka
2011-09-30 9:14 ` Peter Maydell
2011-09-30 20:52 ` Blue Swirl
2011-09-30 20:47 ` Blue Swirl
2011-10-01 6:47 ` Jan Kiszka
2011-10-01 7:31 ` Blue Swirl
2011-10-02 16:27 ` Jan Kiszka
2011-10-02 19:01 ` Blue Swirl
2011-10-02 16:56 ` Avi Kivity [this message]
2011-10-02 19:13 ` Blue Swirl
2011-10-02 19:20 ` Avi Kivity
2011-10-02 19:39 ` Blue Swirl
2011-10-02 19:44 ` Avi Kivity
2011-10-02 19:49 ` Blue Swirl
2011-10-02 19:52 ` Avi Kivity
2011-10-02 19:59 ` Blue Swirl
2011-10-02 20:03 ` Avi Kivity
2011-10-02 20:11 ` Blue Swirl
2011-10-02 20:17 ` Avi Kivity
2011-10-02 20:26 ` Blue Swirl
2011-10-02 20:31 ` Avi Kivity
2011-10-02 20:36 ` Blue Swirl
2011-10-02 20:41 ` Avi Kivity
2011-10-02 20:55 ` Blue Swirl
2011-10-03 7:21 ` Paolo Bonzini
2011-10-04 12:12 ` Avi Kivity
2011-10-01 11:20 ` Peter Maydell
2011-10-02 16:39 ` Avi Kivity
2011-10-02 17:46 ` Jan Kiszka
2011-10-02 19:07 ` Avi Kivity
2011-10-02 19:15 ` Blue Swirl
2011-10-02 19:47 ` Jan Kiszka
2011-10-02 19:50 ` Avi Kivity
2011-10-02 19:06 ` Blue Swirl
2011-10-02 19:08 ` Avi Kivity
2011-10-02 19:26 ` Blue Swirl
2011-10-02 19:35 ` Avi Kivity
2011-10-02 19:40 ` Blue Swirl
2011-10-02 19:47 ` Avi Kivity
2011-10-02 19:52 ` Blue Swirl
2011-10-02 19:58 ` Avi Kivity
2011-10-02 20:05 ` Blue Swirl
2011-10-02 20:14 ` Avi Kivity
2011-10-02 20:18 ` Blue Swirl
2011-10-02 20:21 ` Avi Kivity
2011-10-02 20:30 ` Blue Swirl
2011-10-02 20:39 ` Avi Kivity
2011-10-02 20:53 ` Blue Swirl
2011-09-28 11:00 ` [Qemu-devel] [PATCH 12/22] i8259: Switch to per-PIC IRQ update Jan Kiszka
2011-09-28 11:00 ` [Qemu-devel] [PATCH 13/22] i8259: Fix poll command Jan Kiszka
2011-09-28 11:01 ` [Qemu-devel] [PATCH 14/22] i8259: Clean up pic_ioport_read Jan Kiszka
2011-09-28 11:01 ` [Qemu-devel] [PATCH 15/22] i8259: PREP: Replace pic_intack_read with pic_read_irq Jan Kiszka
2011-09-28 11:15 ` Alexander Graf
2011-09-28 11:01 ` [Qemu-devel] [PATCH 16/22] i8259: Replace PicState::pics_state with master flag Jan Kiszka
2011-09-28 11:01 ` [Qemu-devel] [PATCH 17/22] i8259: Eliminate PicState2 Jan Kiszka
2011-09-28 16:23 ` Richard Henderson
2011-09-28 16:29 ` Richard Henderson
2011-09-28 11:01 ` [Qemu-devel] [PATCH 18/22] qdev: Add HEX8 property Jan Kiszka
2011-09-28 11:01 ` [Qemu-devel] [PATCH 19/22] i8259: Convert to qdev Jan Kiszka
2011-09-28 11:01 ` [Qemu-devel] [PATCH 20/22] i8259: Fix coding style Jan Kiszka
2011-09-28 11:01 ` [Qemu-devel] [PATCH 21/22] monitor: Restrict pic/irq_info to supporting targets Jan Kiszka
2011-09-28 18:19 ` Blue Swirl
2011-09-28 21:26 ` Jan Kiszka
2011-09-29 19:29 ` Blue Swirl
2011-09-30 6:50 ` [Qemu-devel] [PATCH v2 " Jan Kiszka
2011-09-30 20:32 ` Blue Swirl
2011-09-28 11:01 ` [Qemu-devel] [PATCH 22/22] i8259: Move to hw library Jan Kiszka
2011-09-28 18:21 ` Blue Swirl
2011-09-28 21:50 ` [Qemu-devel] [PATCH v2 " Jan Kiszka
2011-09-28 16:39 ` [Qemu-devel] [PATCH 00/22] Rework i8259 and PC interrupt models Richard Henderson
2011-09-28 21:53 ` Jan Kiszka
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