From: Zhou Wang <wangzhou1@hisilicon.com> virt inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IC7KH5 ------------------------------------------------------------------------ Introduce a paravirtualization interface for KVM/arm64 to PV-sgi. A hypercall interface is provided for the guest to interrogate the hypervisor's support for IPIV. In the previous IPIV implementation, the MPIDR value of the vCPU needs to be changed to prevent guests from sending multicast and broadcast. This series of bugfix patches provide a method: Add the SMCCC interface to the kernel so that the guest OS can control the enabling of IPIV. When IPIV is enabled, the guest OS uses multiple unicast to implement multicast. (Broadcasting cannot be implemented due to hardware limitations. If a guest sends a broadcast, an exception message is displayed on the host.) In this way, do not need to modify the MPIDR. Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com> Signed-off-by: Jinqian Yang <yangjinqian1@huawei.com> --- Documentation/virt/kvm/arm/pvsgi.rst | 33 ++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 Documentation/virt/kvm/arm/pvsgi.rst diff --git a/Documentation/virt/kvm/arm/pvsgi.rst b/Documentation/virt/kvm/arm/pvsgi.rst new file mode 100644 index 000000000000..5f12a3aaccd2 --- /dev/null +++ b/Documentation/virt/kvm/arm/pvsgi.rst @@ -0,0 +1,33 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Paravirtualized SGI support for HiSilicon +========================================== + +KVM/arm64 provides some hypervisor service calls to support a paravirtualized +SGI(software generated interrupt) in HiSilicon Hip12 SoC. + +Some SMCCC compatible hypercalls are defined: + +* PV_SGI_FEATURES: 0xC6000090 +* PV_SGI_ENABLE: 0xC6000091 + +The existence of the PV_SGI hypercall should be probed using the SMCCC 1.1 +ARCH_FEATURES mechanism before calling it. + +PV_SGI_FEATURES + + ============= ======== ========== + Function ID: (uint32) 0xC6000090 + PV_call_id: (uint32) The function to query for support. + Currently only PV_SGI_ENABLE is supported. + Return value: (int64) NOT_SUPPORTED (-1) or SUCCESS (0) if the relevant + PV-sgi feature is supported by the hypervisor. + ============= ======== ========== + +PV_SGI_ENABLE + + ============= ======== ========== + Function ID: (uint32) 0xC6000091 + Return value: (int64) NOT_SUPPORTED (-1) or SUCCESS (0) if this feature + has been enabled. + ============= ======== ========== -- 2.33.0