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Re: [libvirt] [PATCH 01/12] qemu: qemuDomainPMSuspendForDuration: Check availability of agent

On a Friday in 2020, Erik Skultety wrote:
On Fri, Sep 11, 2020 at 03:06:08PM +0800, Lin Ma wrote:
It requires a guest agent configured and running in the domain's guest
OS, So check qemu agent during qemuDomainPMSuspendForDuration().

Signed-off-by: Lin Ma <lma suse de>

qemuDomainPMSuspendAgent later in that same function already checks it, we
don't need to check it twice.

It only does so after calling qemuDomainQueryWakeupSuspendSupport, which
requires grabbing a MODIFY job and executing a QMP command.

I think doing this check upfront is reasonable. We will error out as
soon as we know it, just for the price for two extra duplicit lines.



 src/qemu/qemu_driver.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 2e46931c71..bd287f259e 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -16820,6 +16820,9 @@ qemuDomainPMSuspendForDuration(virDomainPtr dom,
     if (virDomainPMSuspendForDurationEnsureACL(dom->conn, vm->def) < 0)
         goto cleanup;

+    if (!qemuDomainAgentAvailable(vm, true))
+        goto cleanup;
      * The case we want to handle here is when QEMU has the API (i.e.
      * QEMU_CAPS_QUERY_CURRENT_MACHINE is set). Otherwise, do not interfere

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