| Message ID | 1397542455-354-7-git-send-email-anup.patel@linaro.org |
|---|---|
| State | New |
| Headers | show |
On Tue, Apr 15 2014 at 7:14:09 am BST, Anup Patel <anup.patel@linaro.org> wrote: > 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> This patch should be posted on the main KVM ML, and reviewed by the KVM maintainers (shouldn't be controvertial though). Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> > --- > Documentation/virtual/kvm/api.txt | 15 +++++++++++++++ > include/uapi/linux/kvm.h | 8 ++++++++ > 2 files changed, 23 insertions(+) > > diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt > index 6dc1db5..c02d725 100644 > --- a/Documentation/virtual/kvm/api.txt > +++ b/Documentation/virtual/kvm/api.txt > @@ -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]; > }; > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > index 01c5624..e86c36a 100644 > --- a/include/uapi/linux/kvm.h > +++ b/include/uapi/linux/kvm.h > @@ -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]; > };
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 6dc1db5..c02d725 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -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]; }; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 01c5624..e86c36a 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -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]; };