[libvirt] [PATCH] docs: Document the real behaviour of suspend-to-{mem, disk}
We get a question every now and then about why hibernation works when suspend-to-disk is disabled and similar. Let's hope that, by documenting the obvious more blatantly, people will get more informed. Signed-off-by: Martin Kletzander <mkletzan@redhat.com> --- docs/formatdomain.html.in | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in index 5bdcb569c4c0..5dcf2fedb01c 100644 --- a/docs/formatdomain.html.in +++ b/docs/formatdomain.html.in @@ -1664,7 +1664,11 @@ <dd>These elements enable ('yes') or disable ('no') BIOS support for S3 (suspend-to-mem) and S4 (suspend-to-disk) ACPI sleep states. If nothing is specified, then the hypervisor will be - left with its default value.</dd> + left with its default value.<br/> + Note: This setting cannot prevent the guest OS from performing + a suspend as the guest OS itself can choose to circumvent the + unavailability of the sleep states (e.g. S4 by turning off + completely).</dd> </dl> <h3><a id="elementsFeatures">Hypervisor features</a></h3> -- 2.14.2
On Fri, Sep 29, 2017 at 02:55:05PM +0200, Martin Kletzander wrote:
We get a question every now and then about why hibernation works when suspend-to-disk is disabled and similar. Let's hope that, by documenting the obvious more blatantly, people will get more informed.
Signed-off-by: Martin Kletzander <mkletzan@redhat.com> --- docs/formatdomain.html.in | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in index 5bdcb569c4c0..5dcf2fedb01c 100644 --- a/docs/formatdomain.html.in +++ b/docs/formatdomain.html.in @@ -1664,7 +1664,11 @@ <dd>These elements enable ('yes') or disable ('no') BIOS support for S3 (suspend-to-mem) and S4 (suspend-to-disk) ACPI sleep states. If nothing is specified, then the hypervisor will be - left with its default value.</dd> + left with its default value.<br/> + Note: This setting cannot prevent the guest OS from performing + a suspend as the guest OS itself can choose to circumvent the + unavailability of the sleep states (e.g. S4 by turning off + completely).</dd> </dl>
So according to what I found, kernel can present shutdown as the default action for hibernation support, maybe a bit strange to me, but documenting it reasonable, I have to dig deeper though to understand the ACPI more. Reviewed-by: Erik Skultety <eskultet@redhat.com>
participants (2)
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Erik Skultety -
Martin Kletzander