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Peter Anvin" , x86@kernel.org Subject: [PATCH RFC 39/39] KVM: x86: declare Xen HVM Dom0 capability Date: Wed, 20 Feb 2019 20:16:09 +0000 Message-Id: <20190220201609.28290-40-joao.m.martins@oracle.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190220201609.28290-1-joao.m.martins@oracle.com> References: <20190220201609.28290-1-joao.m.martins@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9173 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=699 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902200138 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Signed-off-by: Joao Martins Signed-off-by: Ankur Arora --- 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 #include #include +#include #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