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Kirill Smelkov
linux
Commits
186af6bb
Commit
186af6bb
authored
May 20, 2022
by
Paolo Bonzini
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Documentation: kvm: reorder ARM-specific section about KVM_SYSTEM_EVENT_SUSPEND
Signed-off-by:
Paolo Bonzini
<
pbonzini@redhat.com
>
parent
baec4f5a
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Documentation/virt/kvm/api.rst
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186af6bb
...
...
@@ -6176,32 +6176,6 @@ Valid values for 'type' are:
-
KVM_SYSTEM_EVENT_SUSPEND
--
the
guest
has
requested
a
suspension
of
the
VM
.
For
arm
/
arm64
:
--------------
KVM_SYSTEM_EVENT_SUSPEND
exits
are
enabled
with
the
KVM_CAP_ARM_SYSTEM_SUSPEND
VM
capability
.
If
a
guest
invokes
the
PSCI
SYSTEM_SUSPEND
function
,
KVM
will
exit
to
userspace
with
this
event
type
.
It
is
the
sole
responsibility
of
userspace
to
implement
the
PSCI
SYSTEM_SUSPEND
call
according
to
ARM
DEN0022D
.
b
5.19
"SYSTEM_SUSPEND"
.
KVM
does
not
change
the
vCPU
's state before exiting to userspace, so
the call parameters are left in-place in the vCPU registers.
Userspace is _required_ to take action for such an exit. It must
either:
- Honor the guest request to suspend the VM. Userspace can request
in-kernel emulation of suspension by setting the calling vCPU'
s
state
to
KVM_MP_STATE_SUSPENDED
.
Userspace
must
configure
the
vCPU
's
state according to the parameters passed to the PSCI function when
the calling vCPU is resumed. See ARM DEN0022D.b 5.19.1 "Intended use"
for details on the function parameters.
- Deny the guest request to suspend the VM. See ARM DEN0022D.b 5.19.2
"Caller responsibilities" for possible return values.
If
KVM_CAP_SYSTEM_EVENT_DATA
is
present
,
the
'data'
field
can
contain
architecture
specific
information
for
the
system
-
level
event
.
Only
the
first
`
ndata
`
items
(
possibly
zero
)
of
the
data
array
are
valid
.
...
...
@@ -6217,6 +6191,32 @@ Previous versions of Linux defined a `flags` member in this struct. The
field
is
now
aliased
to
`
data
[
0
]`.
Userspace
can
assume
that
it
is
only
written
if
ndata
is
greater
than
0.
For
arm
/
arm64
:
--------------
KVM_SYSTEM_EVENT_SUSPEND
exits
are
enabled
with
the
KVM_CAP_ARM_SYSTEM_SUSPEND
VM
capability
.
If
a
guest
invokes
the
PSCI
SYSTEM_SUSPEND
function
,
KVM
will
exit
to
userspace
with
this
event
type
.
It
is
the
sole
responsibility
of
userspace
to
implement
the
PSCI
SYSTEM_SUSPEND
call
according
to
ARM
DEN0022D
.
b
5.19
"SYSTEM_SUSPEND"
.
KVM
does
not
change
the
vCPU
's state before exiting to userspace, so
the call parameters are left in-place in the vCPU registers.
Userspace is _required_ to take action for such an exit. It must
either:
- Honor the guest request to suspend the VM. Userspace can request
in-kernel emulation of suspension by setting the calling vCPU'
s
state
to
KVM_MP_STATE_SUSPENDED
.
Userspace
must
configure
the
vCPU
's
state according to the parameters passed to the PSCI function when
the calling vCPU is resumed. See ARM DEN0022D.b 5.19.1 "Intended use"
for details on the function parameters.
- Deny the guest request to suspend the VM. See ARM DEN0022D.b 5.19.2
"Caller responsibilities" for possible return values.
::
/* KVM_EXIT_IOAPIC_EOI */
...
...
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