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KVM: x86: API changes for SMM support

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This patch includes changes to the external API for SMM support.
Userspace can predicate the availability of the new fields and
ioctls on a new capability, KVM_CAP_X86_SMM, which is added at the end
of the patch series.

Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2015-04-01 15:06:40 +02:00
parent a584539b24
commit f077825a87
7 changed files with 99 additions and 10 deletions
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40
Documentation/virtual/kvm/api.txt
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@@ -820,11 +820,21 @@ struct kvm_vcpu_events {
} nmi;
__u32 sipi_vector;
__u32 flags;
struct {
__u8 smm;
__u8 pending;
__u8 smm_inside_nmi;
__u8 latched_init;
} smi;
};
KVM_VCPUEVENT_VALID_SHADOW may be set in the flags field to signal that
interrupt.shadow contains a valid state. Otherwise, this field is undefined.
Only two fields are defined in the flags field:
- KVM_VCPUEVENT_VALID_SHADOW may be set in the flags field to signal that
interrupt.shadow contains a valid state.
- KVM_VCPUEVENT_VALID_SMM may be set in the flags field to signal that
smi contains a valid state.
4.32 KVM_SET_VCPU_EVENTS
@@ -841,17 +851,20 @@ vcpu.
See KVM_GET_VCPU_EVENTS for the data structure.
Fields that may be modified asynchronously by running VCPUs can be excluded
from the update. These fields are nmi.pending and sipi_vector. Keep the
corresponding bits in the flags field cleared to suppress overwriting the
current in-kernel state. The bits are:
from the update. These fields are nmi.pending, sipi_vector, smi.smm,
smi.pending. Keep the corresponding bits in the flags field cleared to
suppress overwriting the current in-kernel state. The bits are:
KVM_VCPUEVENT_VALID_NMI_PENDING - transfer nmi.pending to the kernel
KVM_VCPUEVENT_VALID_SIPI_VECTOR - transfer sipi_vector
KVM_VCPUEVENT_VALID_SMM - transfer the smi sub-struct.
If KVM_CAP_INTR_SHADOW is available, KVM_VCPUEVENT_VALID_SHADOW can be set in
the flags field to signal that interrupt.shadow contains a valid state and
shall be written into the VCPU.
KVM_VCPUEVENT_VALID_SMM can only be set if KVM_CAP_X86_SMM is available.
4.33 KVM_GET_DEBUGREGS
@@ -2979,6 +2992,16 @@ len must be a multiple of sizeof(struct kvm_s390_irq). It must be > 0
and it must not exceed (max_vcpus + 32) * sizeof(struct kvm_s390_irq),
which is the maximum number of possibly pending cpu-local interrupts.
4.90 KVM_SMI
Capability: KVM_CAP_X86_SMM
Architectures: x86
Type: vcpu ioctl
Parameters: none
Returns: 0 on success, -1 on error
Queues an SMI on the thread's vcpu.
5. The kvm_run structure
------------------------
@@ -3014,7 +3037,12 @@ an interrupt can be injected now with KVM_INTERRUPT.
The value of the current interrupt flag. Only valid if in-kernel
local APIC is not used.
__u8 padding2[2];
__u16 flags;
More architecture-specific flags detailing state of the VCPU that may
affect the device's behavior. The only currently defined flag is
KVM_RUN_X86_SMM, which is valid on x86 machines and is set if the
VCPU is in system management mode.
/* in (pre_kvm_run), out (post_kvm_run) */
__u64 cr8;