Add /sys/hypervisor support when detecting that Linux is running in a Gunyah environment. Export the version of Gunyah which is reported via the hyp_identify hypercall. Signed-off-by: Elliot Berman <quic_eberman@xxxxxxxxxxx> --- .../ABI/testing/sysfs-hypervisor-gunyah | 37 +++++ MAINTAINERS | 2 + arch/arm64/include/asm/gunyah.h | 4 + drivers/virt/Kconfig | 1 + drivers/virt/Makefile | 1 + drivers/virt/gunyah/Kconfig | 13 ++ drivers/virt/gunyah/Makefile | 4 + drivers/virt/gunyah/sysfs.c | 139 ++++++++++++++++++ 8 files changed, 201 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-hypervisor-gunyah create mode 100644 drivers/virt/gunyah/Kconfig create mode 100644 drivers/virt/gunyah/Makefile create mode 100644 drivers/virt/gunyah/sysfs.c diff --git a/Documentation/ABI/testing/sysfs-hypervisor-gunyah b/Documentation/ABI/testing/sysfs-hypervisor-gunyah new file mode 100644 index 000000000000..ebbdd0aead7b --- /dev/null +++ b/Documentation/ABI/testing/sysfs-hypervisor-gunyah @@ -0,0 +1,37 @@ +What: /sys/hypervisor/type +Date: January 2022 +KernelVersion: 5.17 +Contact: linux-arm-msm@xxxxxxxxxxxxxxx +Description: If running under Gunyah: + Type of hypervisor: + "gunyah": Gunyah hypervisor + +What: /sys/hypervisor/features +Date: January 2022 +KernelVersion: 5.17 +Contact: linux-arm-msm@xxxxxxxxxxxxxxx +Description: If running under Gunyah: + Space separated list of features supported by Linux and Gunyah: + "cspace": Gunyah devices + "doorbell": Sending/receiving virtual interrupts via Gunyah doorbells + "message-queue": Sending/receiving messages via Gunyah message queues + "vic": Interrupt lending + "vpm": Virtual platform management + "vcpu": Virtual CPU management + "memextent": Memory lending/management + "trace": Gunyah hypervisor tracing + + +What: /sys/hypervisor/version/api +Date: April 2020 +KernelVersion: 5.17 +Contact: linux-arm-msm@xxxxxxxxxxxxxxx +Description: If running under Gunyah: + The Gunyah API version. + +What: /sys/hypervisor/version/variant +Date: April 2020 +KernelVersion: 5.17 +Contact: linux-arm-msm@xxxxxxxxxxxxxxx +Description: If running under Gunyah: + The Gunyah variant (build) version. \ No newline at end of file diff --git a/MAINTAINERS b/MAINTAINERS index 405a13e1f4d7..5d46c1f91b92 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8740,9 +8740,11 @@ M: Elliot Berman <quic_eberman@xxxxxxxxxxx> M: Murali Nalajala <quic_mnalajal@xxxxxxxxxxx> L: linux-arm-msm@xxxxxxxxxxxxxxx S: Maintained +F: Documentation/ABI/testing/sysfs-hypervisor-gunyah F: Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml F: Documentation/virt/gunyah/ F: arch/arm64/include/asm/gunyah.h +F: drivers/virt/gunyah/ F: include/linux/gunyah.h HABANALABS PCI DRIVER diff --git a/arch/arm64/include/asm/gunyah.h b/arch/arm64/include/asm/gunyah.h index 2dbef08d58d7..3eef2a9ea299 100644 --- a/arch/arm64/include/asm/gunyah.h +++ b/arch/arm64/include/asm/gunyah.h @@ -19,11 +19,15 @@ (GH_CALL_TYPE_SERVICE << GH_CALL_TYPE_SHIFT) \ | ((fn) & GH_CALL_FUNCTION_NUM_MASK)) +#define GH_HYPERCALL_CALL_UID GH_SERVICE(0x3f01) + #define GH_HYPERCALL(fn) ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_64, \ ARM_SMCCC_OWNER_VENDOR_HYP, \ (GH_CALL_TYPE_HYPERCALL << GH_CALL_TYPE_SHIFT) \ | ((fn) & GH_CALL_FUNCTION_NUM_MASK)) +#define GH_HYPERCALL_HYP_IDENTIFY GH_HYPERCALL(0x0000) + #define ___gh_count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x #define __gh_count_args(...) \ diff --git a/drivers/virt/Kconfig b/drivers/virt/Kconfig index 87ef258cec64..259dc2be6cad 100644 --- a/drivers/virt/Kconfig +++ b/drivers/virt/Kconfig @@ -52,4 +52,5 @@ source "drivers/virt/coco/efi_secret/Kconfig" source "drivers/virt/coco/sev-guest/Kconfig" +source "drivers/virt/gunyah/Kconfig" endif diff --git a/drivers/virt/Makefile b/drivers/virt/Makefile index 093674e05c40..ec4fdfa8eef1 100644 --- a/drivers/virt/Makefile +++ b/drivers/virt/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_FSL_HV_MANAGER) += fsl_hypervisor.o obj-$(CONFIG_VMGENID) += vmgenid.o obj-y += vboxguest/ +obj-$(CONFIG_GUNYAH) += gunyah/ obj-$(CONFIG_NITRO_ENCLAVES) += nitro_enclaves/ obj-$(CONFIG_ACRN_HSM) += acrn/ diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig new file mode 100644 index 000000000000..e88289963518 --- /dev/null +++ b/drivers/virt/gunyah/Kconfig @@ -0,0 +1,13 @@ +# SPDX-License-Identifier: GPL-2.0-only + +config GUNYAH + tristate "Gunyah Virtualization drivers" + depends on ARM64 + select SYS_HYPERVISOR + help + The Gunyah drivers are the helper interfaces that runs in a guest VM + such as basic inter-VM IPC and signaling mechanism,s and higher level + services such as memory/device sharing, IRQ sharing, and so on. + + Say Y here to enable the drivers needed to interact in a Gunyah + virtual environment. diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile new file mode 100644 index 000000000000..0aa086f9149f --- /dev/null +++ b/drivers/virt/gunyah/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only + +gunyah-y += sysfs.o +obj-$(CONFIG_GUNYAH) += gunyah.o \ No newline at end of file diff --git a/drivers/virt/gunyah/sysfs.c b/drivers/virt/gunyah/sysfs.c new file mode 100644 index 000000000000..253433a939cf --- /dev/null +++ b/drivers/virt/gunyah/sysfs.c @@ -0,0 +1,139 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#define pr_fmt(fmt) "gunyah: " fmt + +#include <linux/kobject.h> +#include <linux/gunyah.h> +#include <linux/module.h> +#include <linux/printk.h> +#include <linux/init.h> +#include <linux/of.h> + +#define QC_HYP_UID0 0x19bd54bd +#define QC_HYP_UID1 0x0b37571b +#define QC_HYP_UID2 0x946f609b +#define QC_HYP_UID3 0x54539de6 + +#define GUNYAH_UID0 0x673d5f14 +#define GUNYAH_UID1 0x9265ce36 +#define GUNYAH_UID2 0xa4535fdb +#define GUNYAH_UID3 0xc1d58fcd + +#define gh_uid_matches(prefix, uid) \ + ((uid)[0] == prefix ## _UID0 && (uid)[1] == prefix ## _UID1 && \ + (uid)[2] == prefix ## _UID2 && (uid)[3] == prefix ## _UID3) + +#define GH_API_INFO_API_VERSION(x) (((x) >> 0) & 0x3fff) +#define GH_API_INFO_BIG_ENDIAN(x) (((x) >> 14) & 1) +#define GH_API_INFO_IS_64BIT(x) (((x) >> 15) & 1) +#define GH_API_INFO_VARIANT(x) (((x) >> 56) & 0xff) + +#define GH_IDENTIFY_PARTITION_CSPACE(flags) (((flags)[0] >> 0) & 1) +#define GH_IDENTIFY_DOORBELL(flags) (((flags)[0] >> 1) & 1) +#define GH_IDENTIFY_MSGQUEUE(flags) (((flags)[0] >> 2) & 1) +#define GH_IDENTIFY_VIC(flags) (((flags)[0] >> 3) & 1) +#define GH_IDENTIFY_VPM(flags) (((flags)[0] >> 4) & 1) +#define GH_IDENTIFY_VCPU(flags) (((flags)[0] >> 5) & 1) +#define GH_IDENTIFY_MEMEXTENT(flags) (((flags)[0] >> 6) & 1) +#define GH_IDENTIFY_TRACE_CTRL(flags) (((flags)[0] >> 7) & 1) + +struct gh_hypercall_hyp_identify_resp { + u64 api_info; + u64 flags[3]; +}; + +static struct gh_hypercall_hyp_identify_resp gunyah_api; + +static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr, char *buffer) +{ + return sysfs_emit(buffer, "gunyah\n"); +} +static struct kobj_attribute type_attr = __ATTR_RO(type); + +static ssize_t api_show(struct kobject *kobj, struct kobj_attribute *attr, char *buffer) +{ + return sysfs_emit(buffer, "%d\n", (int)GH_API_INFO_API_VERSION(gunyah_api.api_info)); +} +static struct kobj_attribute api_attr = __ATTR_RO(api); + +static ssize_t variant_show(struct kobject *kobj, struct kobj_attribute *attr, char *buffer) +{ + return sysfs_emit(buffer, "%d\n", (int)GH_API_INFO_VARIANT(gunyah_api.api_info)); +} +static struct kobj_attribute variant_attr = __ATTR_RO(variant); + +static ssize_t features_show(struct kobject *kobj, struct kobj_attribute *attr, char *buffer) +{ + return sysfs_emit(buffer, "\n"); +} +static struct kobj_attribute features_attr = __ATTR_RO(features); + +static struct attribute *version_attrs[] = { + &api_attr.attr, + &variant_attr.attr, + NULL +}; + +static const struct attribute_group version_group = { + .name = "version", + .attrs = version_attrs, +}; + +static int __init gh_sysfs_register(void) +{ + int ret; + + ret = sysfs_create_file(hypervisor_kobj, &type_attr.attr); + if (ret) + return ret; + + ret = sysfs_create_group(hypervisor_kobj, &version_group); + if (ret) + return ret; + + return sysfs_create_file(hypervisor_kobj, &features_attr.attr); +} + +static void gh_sysfs_unregister(void) +{ + sysfs_remove_file(hypervisor_kobj, &type_attr.attr); + sysfs_remove_group(hypervisor_kobj, &version_group); +} + +static int __init gunyah_init(void) +{ + unsigned long uid[4]; + + arch_gh_hypercall(GH_HYPERCALL_CALL_UID, 0, uid[0], uid[1], uid[2], uid[3]); + + if (!(gh_uid_matches(GUNYAH, uid) || gh_uid_matches(QC_HYP, uid))) + return 0; + + arch_gh_hypercall(GH_HYPERCALL_HYP_IDENTIFY, 0, gunyah_api.api_info, + gunyah_api.flags[0], gunyah_api.flags[1], gunyah_api.flags[2]); + + if (GH_API_INFO_API_VERSION(gunyah_api.api_info) != 1) { + pr_warn("Unrecognized gunyah version: %llu. Currently supported: 1\n", + GH_API_INFO_API_VERSION(gunyah_api.api_info)); + return 0; + } + + pr_notice("Running under Gunyah hypervisor v%lld/%llx\n", + GH_API_INFO_API_VERSION(gunyah_api.api_info), + GH_API_INFO_VARIANT(gunyah_api.api_info)); + + return gh_sysfs_register(); +} +module_init(gunyah_init); + +static void __exit gunyah_exit(void) +{ + gh_sysfs_unregister(); +} +module_exit(gunyah_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Gunyah Hypervisor Driver"); -- 2.25.1