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KVM: x86/xen: intercept EVTCHNOP_send from guests

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Userspace registers a sending @port to either deliver to an @eventfd
or directly back to a local event channel port.

After binding events the guest or host may wish to bind those
events to a particular vcpu. This is usually done for unbound
and and interdomain events. Update requests are handled via the
KVM_XEN_EVTCHN_UPDATE flag.

Unregistered ports are handled by the emulator.

Co-developed-by: Ankur Arora <ankur.a.arora@oracle.com>
Co-developed-By: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220303154127.202856-10-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Joao Martins
2022-03-03 15:41:19 +00:00
committed by Paolo Bonzini
parent 35025735a7
commit 2fd6df2f2b
3 changed files with 309 additions and 15 deletions
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28
include/uapi/linux/kvm.h
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@@ -1686,6 +1686,32 @@ struct kvm_xen_hvm_attr {
struct {
__u64 gfn;
} shared_info;
struct {
__u32 send_port;
__u32 type; /* EVTCHNSTAT_ipi / EVTCHNSTAT_interdomain */
__u32 flags;
#define KVM_XEN_EVTCHN_DEASSIGN (1 << 0)
#define KVM_XEN_EVTCHN_UPDATE (1 << 1)
#define KVM_XEN_EVTCHN_RESET (1 << 2)
/*
* Events sent by the guest are either looped back to
* the guest itself (potentially on a different port#)
* or signalled via an eventfd.
*/
union {
struct {
__u32 port;
__u32 vcpu;
__u32 priority;
} port;
struct {
__u32 port; /* Zero for eventfd */
__s32 fd;
} eventfd;
__u32 padding[4];
} deliver;
} evtchn;
__u64 pad[8];
} u;
};
@@ -1694,6 +1720,8 @@ struct kvm_xen_hvm_attr {
#define KVM_XEN_ATTR_TYPE_LONG_MODE 0x0
#define KVM_XEN_ATTR_TYPE_SHARED_INFO 0x1
#define KVM_XEN_ATTR_TYPE_UPCALL_VECTOR 0x2
/* Available with KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_EVTCHN_SEND */
#define KVM_XEN_ATTR_TYPE_EVTCHN 0x3
/* Per-vCPU Xen attributes */
#define KVM_XEN_VCPU_GET_ATTR _IOWR(KVMIO, 0xca, struct kvm_xen_vcpu_attr)