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Documentation: kvm: reorder ARM-specific section about KVM_SYSTEM_EVENT_SUSPEND

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini 2022-05-20 07:22:46 -04:00
parent baec4f5a01
commit 186af6bb40
1 changed files with 26 additions and 26 deletions
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52
Documentation/virt/kvm/api.rst
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@ -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 */