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KVM: Add KVM_EXIT_SYSTEM_EVENT to user space API header 

Currently, we don't have an exit reason to notify user space about
a system-level event (for e.g. system reset or shutdown) triggered
by the VCPU. This patch adds exit reason KVM_EXIT_SYSTEM_EVENT for
this purpose. We can also inform user space about the 'type' and
architecture specific 'flags' of a system-level event using the
kvm_run structure.

This newly added KVM_EXIT_SYSTEM_EVENT will be used by KVM ARM/ARM64
in-kernel PSCI v0.2 support to reset/shutdown VMs.

Signed-off-by: Anup Patel <anup.patel@linaro.org>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Anup Patel 2014-04-29 11:24:19 +05:30 committed by Christoffer Dall
parent e8e7fcc5e2
commit 8ad6b63492
2 changed files with 23 additions and 0 deletions
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15
Documentation/virtual/kvm/api.txt
View File

@ -2740,6 +2740,21 @@ It gets triggered whenever both KVM_CAP_PPC_EPR are enabled and an
external interrupt has just been delivered into the guest. User space
should put the acknowledged interrupt vector into the 'epr' field.
/* KVM_EXIT_SYSTEM_EVENT */
struct {
#define KVM_SYSTEM_EVENT_SHUTDOWN 1
#define KVM_SYSTEM_EVENT_RESET 2
__u32 type;
__u64 flags;
} system_event;
If exit_reason is KVM_EXIT_SYSTEM_EVENT then the vcpu has triggered
a system-level event using some architecture specific mechanism (hypercall
or some special instruction). In case of ARM/ARM64, this is triggered using
HVC instruction based PSCI call from the vcpu. The 'type' field describes
the system-level event type. The 'flags' field describes architecture
specific flags for the system-level event.
/* Fix the size of the union. */
char padding[256];
};

8
include/uapi/linux/kvm.h
View File

@ -171,6 +171,7 @@ struct kvm_pit_config {
#define KVM_EXIT_WATCHDOG 21
#define KVM_EXIT_S390_TSCH 22
#define KVM_EXIT_EPR 23
#define KVM_EXIT_SYSTEM_EVENT 24
/* For KVM_EXIT_INTERNAL_ERROR */
/* Emulate instruction failed. */
@ -301,6 +302,13 @@ struct kvm_run {
struct {
__u32 epr;
} epr;
/* KVM_EXIT_SYSTEM_EVENT */
struct {
#define KVM_SYSTEM_EVENT_SHUTDOWN 1
#define KVM_SYSTEM_EVENT_RESET 2
__u32 type;
__u64 flags;
} system_event;
/* Fix the size of the union. */
char padding[256];
};