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    Subject[PATCH RFC 39/39] KVM: x86: declare Xen HVM Dom0 capability
    Date
    Add new capability for domid, interdomain/unbound event channel types
    and grant table support in hypervisor. This would be used to drive Xen
    kernel backends.

    Co-developed-by: Ankur Arora <ankur.a.arora@oracle.com>
    Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
    Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
    ---
    Documentation/virtual/kvm/api.txt | 10 ++++++++++
    arch/x86/kvm/x86.c | 4 ++++
    include/uapi/linux/kvm.h | 3 +++
    3 files changed, 17 insertions(+)

    diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
    index 36d9386415fa..311dcded5e28 100644
    --- a/Documentation/virtual/kvm/api.txt
    +++ b/Documentation/virtual/kvm/api.txt
    @@ -5046,3 +5046,13 @@ This capability indicates KVM's support for the event channel offload.
    Implies support for KVM_IRQ_ROUTING_XEN_EVTCHN irq routing, and
    for attribute KVM_XEN_ATTR_TYPE_EVTCHN in KVM_XEN_HVM_GET_ATTR or
    KVM_XEN_HVM_SET_ATTR.
    +
    +8.24 KVM_CAP_XEN_HVM_DOM0
    +
    +Architectures: x86
    +
    +This capability indicates support for assigning domid and handling kernel
    +backends in the hypervisor. Also implies that attributes
    +KVM_XEN_ATTR_TYPE_DOMID, KVM_XEN_ATTR_TYPE_GNTTAB are supported. For the
    +existing KVM_XEN_ATTR_TYPE_EVTCHN attribute, it indicates support for
    +interdomain and unbound event channels.
    diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
    index cb95f7f8bed9..e8c3494b10cb 100644
    --- a/arch/x86/kvm/x86.c
    +++ b/arch/x86/kvm/x86.c
    @@ -71,6 +71,7 @@
    #include <asm/mshyperv.h>
    #include <asm/hypervisor.h>
    #include <asm/intel_pt.h>
    +#include <xen/xen.h>

    #define CREATE_TRACE_POINTS
    #include "trace.h"
    @@ -3049,6 +3050,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
    case KVM_CAP_ADJUST_CLOCK:
    r = KVM_CLOCK_TSC_STABLE;
    break;
    + case KVM_CAP_XEN_HVM_DOM0:
    + r = xen_shim_domain();
    + break;
    case KVM_CAP_X86_DISABLE_EXITS:
    r |= KVM_X86_DISABLE_EXITS_HLT | KVM_X86_DISABLE_EXITS_PAUSE;
    if(kvm_can_mwait_in_guest())
    diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
    index 74d877792dfa..d817a7bbf507 100644
    --- a/include/uapi/linux/kvm.h
    +++ b/include/uapi/linux/kvm.h
    @@ -1005,6 +1005,7 @@ struct kvm_ppc_resize_hpt {
    #define KVM_CAP_HYPERV_CPUID 167
    #define KVM_CAP_XEN_HVM_GUEST 168
    #define KVM_CAP_XEN_HVM_EVTCHN 169
    +#define KVM_CAP_XEN_HVM_DOM0 170

    #ifdef KVM_CAP_IRQ_ROUTING

    @@ -1485,6 +1486,7 @@ struct kvm_xen_hvm_attr {

    #define XEN_EVTCHN_TYPE_VIRQ 0
    #define XEN_EVTCHN_TYPE_IPI 1
    +/* Available with KVM_CAP_XEN_HVM_DOM0 */
    #define XEN_EVTCHN_TYPE_INTERDOM 2
    #define XEN_EVTCHN_TYPE_UNBOUND 3
    __u32 type;
    @@ -1536,6 +1538,7 @@ struct kvm_xen_hvm_attr {
    #define KVM_XEN_ATTR_TYPE_VCPU_RUNSTATE 0x3
    /* Available with KVM_CAP_XEN_HVM_EVTCHN */
    #define KVM_XEN_ATTR_TYPE_EVTCHN 0x4
    +/* Available with KVM_CAP_XEN_HVM_DOM0 */
    #define KVM_XEN_ATTR_TYPE_DOMID 0x5
    #define KVM_XEN_ATTR_TYPE_GNTTAB 0x6

    --
    2.11.0
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