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Fri, 20 Jan 2023 22:47:36 GMT Received: from hu-eberman-lv.qualcomm.com (10.49.16.6) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.36; Fri, 20 Jan 2023 14:47:35 -0800 From: Elliot Berman To: Bjorn Andersson , Alex Elder , Elliot Berman , Murali Nalajala CC: Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Prakruthi Deepak Heragu , Dmitry Baryshkov , Arnd Bergmann , "Greg Kroah-Hartman" , Rob Herring , Krzysztof Kozlowski , Jonathan Corbet , Bagas Sanjaya , Catalin Marinas , Will Deacon , Marc Zyngier , Jassi Brar , Sudeep Holla , , , , , Subject: [PATCH v9 05/27] virt: gunyah: Identify hypervisor version Date: Fri, 20 Jan 2023 14:46:04 -0800 Message-ID: <20230120224627.4053418-6-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230120224627.4053418-1-quic_eberman@quicinc.com> References: <20230120224627.4053418-1-quic_eberman@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01c.na.qualcomm.com (10.47.97.35) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: 6Upn7tBCYYsP4iIn8eZYgneASuW-c2Kd X-Proofpoint-ORIG-GUID: 6Upn7tBCYYsP4iIn8eZYgneASuW-c2Kd X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-01-20_11,2023-01-20_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxlogscore=999 spamscore=0 suspectscore=0 mlxscore=0 adultscore=0 clxscore=1015 impostorscore=0 priorityscore=1501 bulkscore=0 malwarescore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301200218 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230120_144746_770898_A8AAAFC7 X-CRM114-Status: GOOD ( 21.41 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Export the version of Gunyah which is reported via the hyp_identify hypercall. Increments of the major API version indicate possibly backwards incompatible changes. Export the hypervisor identity so that Gunyah drivers can act according to the major API version. Signed-off-by: Elliot Berman --- drivers/virt/Makefile | 1 + drivers/virt/gunyah/Makefile | 3 ++ drivers/virt/gunyah/gunyah.c | 54 ++++++++++++++++++++++++++++++++++++ 3 files changed, 58 insertions(+) create mode 100644 drivers/virt/gunyah/Makefile create mode 100644 drivers/virt/gunyah/gunyah.c diff --git a/drivers/virt/Makefile b/drivers/virt/Makefile index e9aa6fc96fab..a5817e2d7d71 100644 --- a/drivers/virt/Makefile +++ b/drivers/virt/Makefile @@ -12,3 +12,4 @@ obj-$(CONFIG_ACRN_HSM) += acrn/ obj-$(CONFIG_EFI_SECRET) += coco/efi_secret/ obj-$(CONFIG_SEV_GUEST) += coco/sev-guest/ obj-$(CONFIG_INTEL_TDX_GUEST) += coco/tdx-guest/ +obj-y += gunyah/ diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile new file mode 100644 index 000000000000..34f32110faf9 --- /dev/null +++ b/drivers/virt/gunyah/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_GUNYAH) += gunyah.o diff --git a/drivers/virt/gunyah/gunyah.c b/drivers/virt/gunyah/gunyah.c new file mode 100644 index 000000000000..776e83c6920d --- /dev/null +++ b/drivers/virt/gunyah/gunyah.c @@ -0,0 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#define pr_fmt(fmt) "gunyah: " fmt + +#include +#include +#include +#include + +static struct gh_hypercall_hyp_identify_resp gunyah_api; + +u16 gh_api_version(void) +{ + return FIELD_GET(GH_API_INFO_API_VERSION_MASK, gunyah_api.api_info); +} +EXPORT_SYMBOL_GPL(gh_api_version); + +bool gh_api_has_feature(enum gh_api_feature feature) +{ + switch (feature) { + case GH_API_FEATURE_DOORBELL: + return !!(gunyah_api.flags[0] & GH_IDENTIFY_DOORBELL); + case GH_API_FEATURE_MSGQUEUE: + return !!(gunyah_api.flags[0] & GH_IDENTIFY_MSGQUEUE); + case GH_API_FEATURE_VCPU: + return !!(gunyah_api.flags[0] & GH_IDENTIFY_VCPU); + case GH_API_FEATURE_MEMEXTENT: + return !!(gunyah_api.flags[0] & GH_IDENTIFY_MEMEXTENT); + default: + return false; + } +} +EXPORT_SYMBOL_GPL(gh_api_has_feature); + +static int __init gunyah_init(void) +{ + if (!arch_is_gunyah_guest()) + return -ENODEV; + + gh_hypercall_hyp_identify(&gunyah_api); + + pr_info("Running under Gunyah hypervisor %llx/v%u\n", + FIELD_GET(GH_API_INFO_VARIANT_MASK, gunyah_api.api_info), + gh_api_version()); + + return 0; +} +arch_initcall(gunyah_init); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Gunyah Hypervisor Driver");