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Tue, 13 Jun 2023 17:21:24 +0000 Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 35DHLMkP020980 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 13 Jun 2023 17:21:22 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 15.2.986.42; Tue, 13 Jun 2023 10:21:21 -0700 From: Elliot Berman To: Alex Elder , Srinivas Kandagatla , Catalin Marinas , Will Deacon , Elliot Berman , Prakruthi Deepak Heragu CC: Murali Nalajala , Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Dmitry Baryshkov , Bjorn Andersson , "Konrad Dybcio" , Arnd Bergmann , "Greg Kroah-Hartman" , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Corbet , Bagas Sanjaya , Andy Gross , Jassi Brar , , , , , Subject: [PATCH v14 04/25] virt: gunyah: Add hypercalls to identify Gunyah Date: Tue, 13 Jun 2023 10:20:32 -0700 Message-ID: <20230613172054.3959700-5-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230613172054.3959700-1-quic_eberman@quicinc.com> References: <20230613172054.3959700-1-quic_eberman@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) 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-ORIG-GUID: h2ZyjYsrTu6891F2Bz--4fthh2Mhu1P1 X-Proofpoint-GUID: h2ZyjYsrTu6891F2Bz--4fthh2Mhu1P1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-06-13_19,2023-06-12_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 bulkscore=0 adultscore=0 mlxscore=0 mlxlogscore=999 clxscore=1015 impostorscore=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306130153 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE, T_SCC_BODY_TEXT_LINE,T_SPF_TEMPERROR,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1768609876110798783?= X-GMAIL-MSGID: =?utf-8?q?1768609876110798783?= Add hypercalls to identify when Linux is running a virtual machine under Gunyah. There are two calls to help identify Gunyah: 1. gh_hypercall_get_uid() returns a UID when running under a Gunyah hypervisor. 2. gh_hypercall_hyp_identify() returns build information and a set of feature flags that are supported by Gunyah. Reviewed-by: Srinivas Kandagatla Reviewed-by: Alex Elder Signed-off-by: Elliot Berman --- arch/arm64/Kbuild | 1 + arch/arm64/gunyah/Makefile | 3 ++ arch/arm64/gunyah/gunyah_hypercall.c | 58 ++++++++++++++++++++++++++++ drivers/virt/Kconfig | 2 + drivers/virt/gunyah/Kconfig | 13 +++++++ include/linux/gunyah.h | 31 +++++++++++++++ 6 files changed, 108 insertions(+) create mode 100644 arch/arm64/gunyah/Makefile create mode 100644 arch/arm64/gunyah/gunyah_hypercall.c create mode 100644 drivers/virt/gunyah/Kconfig diff --git a/arch/arm64/Kbuild b/arch/arm64/Kbuild index 5bfbf7d79c99b..e4847ba0e3c95 100644 --- a/arch/arm64/Kbuild +++ b/arch/arm64/Kbuild @@ -3,6 +3,7 @@ obj-y += kernel/ mm/ net/ obj-$(CONFIG_KVM) += kvm/ obj-$(CONFIG_XEN) += xen/ obj-$(subst m,y,$(CONFIG_HYPERV)) += hyperv/ +obj-$(CONFIG_GUNYAH) += gunyah/ obj-$(CONFIG_CRYPTO) += crypto/ # for cleaning diff --git a/arch/arm64/gunyah/Makefile b/arch/arm64/gunyah/Makefile new file mode 100644 index 0000000000000..84f1e38cafb1e --- /dev/null +++ b/arch/arm64/gunyah/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_GUNYAH) += gunyah_hypercall.o diff --git a/arch/arm64/gunyah/gunyah_hypercall.c b/arch/arm64/gunyah/gunyah_hypercall.c new file mode 100644 index 0000000000000..ef48e0b8b5448 --- /dev/null +++ b/arch/arm64/gunyah/gunyah_hypercall.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include +#include +#include +#include + +/* {c1d58fcd-a453-5fdb-9265-ce36673d5f14} */ +static const uuid_t GUNYAH_UUID = + UUID_INIT(0xc1d58fcd, 0xa453, 0x5fdb, 0x92, 0x65, 0xce, 0x36, 0x67, 0x3d, 0x5f, 0x14); + +bool arch_is_gh_guest(void) +{ + struct arm_smccc_res res; + uuid_t uuid; + u32 *up; + + arm_smccc_1_1_hvc(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, &res); + + up = (u32 *)&uuid.b[0]; + up[0] = lower_32_bits(res.a0); + up[1] = lower_32_bits(res.a1); + up[2] = lower_32_bits(res.a2); + up[3] = lower_32_bits(res.a3); + + return uuid_equal(&uuid, &GUNYAH_UUID); +} +EXPORT_SYMBOL_GPL(arch_is_gh_guest); + +#define GH_HYPERCALL(fn) ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_64, \ + ARM_SMCCC_OWNER_VENDOR_HYP, \ + fn) + +#define GH_HYPERCALL_HYP_IDENTIFY GH_HYPERCALL(0x8000) + +/** + * gh_hypercall_hyp_identify() - Returns build information and feature flags + * supported by Gunyah. + * @hyp_identity: filled by the hypercall with the API info and feature flags. + */ +void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identity) +{ + struct arm_smccc_res res; + + arm_smccc_1_1_hvc(GH_HYPERCALL_HYP_IDENTIFY, &res); + + hyp_identity->api_info = res.a0; + hyp_identity->flags[0] = res.a1; + hyp_identity->flags[1] = res.a2; + hyp_identity->flags[2] = res.a3; +} +EXPORT_SYMBOL_GPL(gh_hypercall_hyp_identify); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Gunyah Hypervisor Hypercalls"); diff --git a/drivers/virt/Kconfig b/drivers/virt/Kconfig index f79ab13a5c28b..85bd6626ffc90 100644 --- a/drivers/virt/Kconfig +++ b/drivers/virt/Kconfig @@ -54,4 +54,6 @@ source "drivers/virt/coco/sev-guest/Kconfig" source "drivers/virt/coco/tdx-guest/Kconfig" +source "drivers/virt/gunyah/Kconfig" + endif diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig new file mode 100644 index 0000000000000..1a737694c333d --- /dev/null +++ b/drivers/virt/gunyah/Kconfig @@ -0,0 +1,13 @@ +# SPDX-License-Identifier: GPL-2.0-only + +config GUNYAH + tristate "Gunyah Virtualization drivers" + depends on ARM64 + depends on MAILBOX + help + The Gunyah drivers are the helper interfaces that run in a guest VM + such as basic inter-VM IPC and signaling mechanisms, and higher level + services such as memory/device sharing, IRQ sharing, and so on. + + Say Y/M here to enable the drivers needed to interact in a Gunyah + virtual environment. diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h index a4e8ec91961d1..6b36cf4787efb 100644 --- a/include/linux/gunyah.h +++ b/include/linux/gunyah.h @@ -6,8 +6,10 @@ #ifndef _LINUX_GUNYAH_H #define _LINUX_GUNYAH_H +#include #include #include +#include /******************************************************************************/ /* Common arch-independent definitions for Gunyah hypercalls */ @@ -80,4 +82,33 @@ static inline int gh_error_remap(enum gh_error gh_error) } } +enum gh_api_feature { + GH_FEATURE_DOORBELL = 1, + GH_FEATURE_MSGQUEUE = 2, + GH_FEATURE_VCPU = 5, + GH_FEATURE_MEMEXTENT = 6, +}; + +bool arch_is_gh_guest(void); + +#define GH_API_V1 1 + +/* Other bits reserved for future use and will be zero */ +#define GH_API_INFO_API_VERSION_MASK GENMASK_ULL(13, 0) +#define GH_API_INFO_BIG_ENDIAN BIT_ULL(14) +#define GH_API_INFO_IS_64BIT BIT_ULL(15) +#define GH_API_INFO_VARIANT_MASK GENMASK_ULL(63, 56) + +struct gh_hypercall_hyp_identify_resp { + u64 api_info; + u64 flags[3]; +}; + +static inline u16 gh_api_version(const struct gh_hypercall_hyp_identify_resp *gh_api) +{ + return FIELD_GET(GH_API_INFO_API_VERSION_MASK, gh_api->api_info); +} + +void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identity); + #endif