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[Qemu-devel] [PATCH v9 1/3] qmp: query-current-machine with wakeup-suspe
From: |
Daniel Henrique Barboza |
Subject: |
[Qemu-devel] [PATCH v9 1/3] qmp: query-current-machine with wakeup-suspend-support |
Date: |
Tue, 18 Sep 2018 15:52:44 -0300 |
When issuing the qmp/hmp 'system_wakeup' command, what happens in a
nutshell is:
- qmp_system_wakeup_request set runstate to RUNNING, sets a wakeup_reason
and notify the event
- in the main_loop, all vcpus are paused, a system reset is issued, all
subscribers of wakeup_notifiers receives a notification, vcpus are then
resumed and the wake up QAPI event is fired
Note that this procedure alone doesn't ensure that the guest will awake
from SUSPENDED state - the subscribers of the wake up event must take
action to resume the guest, otherwise the guest will simply reboot. At
this moment, only the ACPI machines via acpi_pm1_cnt_init has wake-up
from suspend support.
However, only the presence of 'system_wakeup' is required for QGA to
support 'guest-suspend-ram' and 'guest-suspend-hybrid' at this moment.
This means that the user/management will expect to suspend the guest using
one of those suspend commands and then resume execution using system_wakeup,
regardless of the support offered in system_wakeup in the first place.
This patch creates a new API called query-current-machine [1], that holds
a new flag called 'wakeup-suspend-support' that indicates if the guest
supports wake up from suspend via system_wakeup. The machine is considered
to implement wake-up support if a call to a new 'qemu_register_wakeup_support'
is made during its init, as it is now being done inside acpi_pm1_cnt_init.
This allows for any other machine type to declare wake-up support regardless
of ACPI state or wakeup_notifiers subscription, making easier for
newer implementations that might have its own mechanisms in the future.
This is the expected output of query-current-machine when running a x86
guest:
{"execute" : "query-current-machine"}
{"return": {"wakeup-suspend-support": true}}
Running the same x86 guest, but with the --no-acpi option:
{"execute" : "query-current-machine"}
{"return": {"wakeup-suspend-support": false}}
This is the output when running a pseries guest:
{"execute" : "query-current-machine"}
{"return": {"wakeup-suspend-support": false}}
With this extra tool, management can avoid situations where a guest
that does not have proper suspend/wake capabilities ends up in
inconsistent state (e.g.
https://github.com/open-power-host-os/qemu/issues/31).
[1] the decision of creating the query-current-machine API is based
on discussions in the QEMU mailing list where it was decided that
query-target wasn't a proper place to store the wake-up flag, neither
was query-machines because this isn't a static property of the
machine object. This new API can then be used to store other
dynamic machine properties that are scattered around the code
ATM. More info at:
https://lists.gnu.org/archive/html/qemu-devel/2018-05/msg04235.html
Reported-by: Balamuruhan S <address@hidden>
Signed-off-by: Daniel Henrique Barboza <address@hidden>
---
hw/acpi/core.c | 1 +
include/sysemu/sysemu.h | 1 +
qapi/misc.json | 24 ++++++++++++++++++++++++
vl.c | 19 +++++++++++++++++++
4 files changed, 45 insertions(+)
diff --git a/hw/acpi/core.c b/hw/acpi/core.c
index b8d39012cd..2dea893245 100644
--- a/hw/acpi/core.c
+++ b/hw/acpi/core.c
@@ -617,6 +617,7 @@ void acpi_pm1_cnt_init(ACPIREGS *ar, MemoryRegion *parent,
ar->pm1.cnt.s4_val = s4_val;
ar->wakeup.notify = acpi_notify_wakeup;
qemu_register_wakeup_notifier(&ar->wakeup);
+ qemu_register_wakeup_support();
memory_region_init_io(&ar->pm1.cnt.io, memory_region_owner(parent),
&acpi_pm_cnt_ops, ar, "acpi-cnt", 2);
memory_region_add_subregion(parent, 4, &ar->pm1.cnt.io);
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 8d6095d98b..0446adacc6 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -77,6 +77,7 @@ void qemu_register_suspend_notifier(Notifier *notifier);
void qemu_system_wakeup_request(WakeupReason reason);
void qemu_system_wakeup_enable(WakeupReason reason, bool enabled);
void qemu_register_wakeup_notifier(Notifier *notifier);
+void qemu_register_wakeup_support(void);
void qemu_system_shutdown_request(ShutdownCause reason);
void qemu_system_powerdown_request(void);
void qemu_register_powerdown_notifier(Notifier *notifier);
diff --git a/qapi/misc.json b/qapi/misc.json
index d450cfef21..b616d385a4 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -2003,6 +2003,30 @@
##
{ 'command': 'query-machines', 'returns': ['MachineInfo'] }
+##
+# @CurrentMachineParams:
+#
+# Information describing the running machine parameters.
+#
+# @wakeup-suspend-support: true if the target supports wake up from
+# suspend
+#
+# Since: 3.1.0
+##
+{ 'struct': 'CurrentMachineParams',
+ 'data': { 'wakeup-suspend-support': 'bool'} }
+
+##
+# @query-current-machine:
+#
+# Return a list of parameters of the running machine.
+#
+# Returns: CurrentMachineParams
+#
+# Since: 3.1.0
+##
+{ 'command': 'query-current-machine', 'returns': 'CurrentMachineParams' }
+
##
# @CpuDefinitionInfo:
#
diff --git a/vl.c b/vl.c
index 5ba06adf78..f78947f69c 100644
--- a/vl.c
+++ b/vl.c
@@ -184,6 +184,7 @@ bool boot_strict;
uint8_t *boot_splash_filedata;
size_t boot_splash_filedata_size;
uint8_t qemu_extra_params_fw[2];
+bool wakeup_suspend_enabled;
int icount_align_option;
@@ -1753,6 +1754,24 @@ void qemu_register_wakeup_notifier(Notifier *notifier)
notifier_list_add(&wakeup_notifiers, notifier);
}
+void qemu_register_wakeup_support(void)
+{
+ wakeup_suspend_enabled = true;
+}
+
+static bool qemu_wakeup_suspend_enabled(void)
+{
+ return wakeup_suspend_enabled;
+}
+
+CurrentMachineParams *qmp_query_current_machine(Error **errp)
+{
+ CurrentMachineParams *params = g_malloc0(sizeof(*params));
+ params->wakeup_suspend_support = qemu_wakeup_suspend_enabled();
+
+ return params;
+}
+
void qemu_system_killed(int signal, pid_t pid)
{
shutdown_signal = signal;
--
2.17.1