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KVM: arm64: Add support for userspace to suspend a vCPU

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Introduce a new MP state, KVM_MP_STATE_SUSPENDED, which indicates a vCPU
is in a suspended state. In the suspended state the vCPU will block
until a wakeup event (pending interrupt) is recognized.

Add a new system event type, KVM_SYSTEM_EVENT_WAKEUP, to indicate to
userspace that KVM has recognized one such wakeup event. It is the
responsibility of userspace to then make the vCPU runnable, or leave it
suspended until the next wakeup event.

Signed-off-by: Oliver Upton <oupton@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220504032446.4133305-7-oupton@google.com
This commit is contained in:
Oliver Upton 2022-05-04 03:24:40 +00:00 • committed by Marc Zyngier
parent 3fdd04592d
commit 7b33a09d03
4 changed files with 89 additions and 2 deletions
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2
include/uapi/linux/kvm.h
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@ -444,6 +444,7 @@ struct kvm_run {
#define KVM_SYSTEM_EVENT_SHUTDOWN 1
#define KVM_SYSTEM_EVENT_RESET 2
#define KVM_SYSTEM_EVENT_CRASH 3
#define KVM_SYSTEM_EVENT_WAKEUP 4
__u32 type;
__u32 ndata;
union {
@ -646,6 +647,7 @@ struct kvm_vapic_addr {
#define KVM_MP_STATE_OPERATING 7
#define KVM_MP_STATE_LOAD 8
#define KVM_MP_STATE_AP_RESET_HOLD 9
#define KVM_MP_STATE_SUSPENDED 10
struct kvm_mp_state {
__u32 mp_state;