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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1725446643; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=eSq36wEoFMQt1F3L+hqPt13HrcODhRNsn708OxHwApw=; b=MKWS7diOhGt4p3jpBey7KR6XadL4DDsv/v7cfij9s0FmSLamanXGimgKmmZMAe9Z4pHjf/ 1EcPRTDVG6MPUbg171hZIfmrGLFZPnlX5NFOgkKL1Ix5QNBkjHJ+1SWQlkAtpui65Mt76D OrcFFYjXqNSO6mG3+Q9zcYnBvtCkTC8= X-MC-Unique: oSqZ8Bo1NJuYaNltTtPxYg-1 From: Juraj Marcin To: qemu-devel@nongnu.org Cc: Juraj Marcin , David Hildenbrand , Peter Maydell Subject: [PATCH v3 2/4] reset: Add RESET_TYPE_WAKEUP Date: Wed, 4 Sep 2024 12:37:13 +0200 Message-ID: <20240904103722.946194-3-jmarcin@redhat.com> In-Reply-To: <20240904103722.946194-1-jmarcin@redhat.com> References: <20240904103722.946194-1-jmarcin@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" Some devices need to distinguish cold start reset from waking up from a suspended state. This patch adds new value to the enum, and updates the i386 wakeup method to use this new reset type. Signed-off-by: Juraj Marcin Reviewed-by: David Hildenbrand --- docs/devel/reset.rst | 11 +++++++++++ hw/i386/pc.c | 2 +- include/hw/resettable.h | 2 ++ 3 files changed, 14 insertions(+), 1 deletion(-) diff --git a/docs/devel/reset.rst b/docs/devel/reset.rst index 9746a4e8a0..bb94271c1c 100644 --- a/docs/devel/reset.rst +++ b/docs/devel/reset.rst @@ -44,6 +44,17 @@ The Resettable interface handles reset types with an enu= m ``ResetType``: value on each cold reset, such as RNG seed information, and which they must not reinitialize on a snapshot-load reset. =20 +``RESET_TYPE_WAKEUP`` + If the machine supports waking up from a suspended state and needs to re= set + its devices during wake-up (from the ``MachineClass::wakeup()`` method),= this + reset type should be used for such a request. Devices can utilize this r= eset + type to differentiate the reset requested during machine wake-up from ot= her + reset requests. For example, RAM content must not be lost during wake-up= , and + memory devices like virtio-mem that provide additional RAM must not reset + such state during wake-ups, but might do so during cold resets. However,= this + reset type should not be used for wake-up detection, as not every machine + type issues a device reset request during wake-up. + Devices which implement reset methods must treat any unknown ``ResetType`` as equivalent to ``RESET_TYPE_COLD``; this will reduce the amount of existing code we need to change if we add more types in future. diff --git a/hw/i386/pc.c b/hw/i386/pc.c index d5cf2309c9..fc7d363f59 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1726,7 +1726,7 @@ static void pc_machine_reset(MachineState *machine, R= esetType type) static void pc_machine_wakeup(MachineState *machine) { cpu_synchronize_all_states(); - pc_machine_reset(machine, RESET_TYPE_COLD); + pc_machine_reset(machine, RESET_TYPE_WAKEUP); cpu_synchronize_all_post_reset(); } =20 diff --git a/include/hw/resettable.h b/include/hw/resettable.h index 7e249deb8b..edb1f1361b 100644 --- a/include/hw/resettable.h +++ b/include/hw/resettable.h @@ -29,6 +29,7 @@ typedef struct ResettableState ResettableState; * Types of reset. * * + Cold: reset resulting from a power cycle of the object. + * + Wakeup: reset resulting from a wake-up from a suspended state. * * TODO: Support has to be added to handle more types. In particular, * ResettableState structure needs to be expanded. @@ -36,6 +37,7 @@ typedef struct ResettableState ResettableState; typedef enum ResetType { RESET_TYPE_COLD, RESET_TYPE_SNAPSHOT_LOAD, + RESET_TYPE_WAKEUP, } ResetType; =20 /* --=20 2.46.0