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. Signed-off-by: Elliot Berman <quic_eberman@xxxxxxxxxxx> --- MAINTAINERS | 2 + arch/arm64/Kbuild | 1 + arch/arm64/gunyah/Makefile | 1 + arch/arm64/gunyah/gunyah_hypercall.c | 69 ++++++++++++++++++++++++++++ drivers/virt/Kconfig | 1 + drivers/virt/gunyah/Kconfig | 12 +++++ include/linux/gunyah.h | 25 ++++++++++ 7 files changed, 111 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/MAINTAINERS b/MAINTAINERS index c0d46ab5b199..69c1835b3bb4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8945,6 +8945,8 @@ L: linux-arm-msm@xxxxxxxxxxxxxxx S: Supported F: Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml F: Documentation/virt/gunyah/ +F: arch/arm64/gunyah/ +F: drivers/virt/gunyah/ F: include/linux/gunyah.h HABANALABS PCI DRIVER diff --git a/arch/arm64/Kbuild b/arch/arm64/Kbuild index 5bfbf7d79c99..e4847ba0e3c9 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 000000000000..9fbc720b6fb6 --- /dev/null +++ b/arch/arm64/gunyah/Makefile @@ -0,0 +1 @@ +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 000000000000..0beb3123d650 --- /dev/null +++ b/arch/arm64/gunyah/gunyah_hypercall.c @@ -0,0 +1,69 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include <linux/arm-smccc.h> +#include <linux/module.h> +#include <linux/gunyah.h> + +#define GH_CALL_TYPE_PLATFORM_CALL 0 +#define GH_CALL_TYPE_HYPERCALL 2 +#define GH_CALL_TYPE_SERVICE 3 +#define GH_CALL_TYPE_SHIFT 14 +#define GH_CALL_FUNCTION_NUM_MASK 0x3fff + +#define GH_FN_ID(type, num) ((type) << GH_CALL_TYPE_SHIFT | ((num) & GH_CALL_FUNCTION_NUM_MASK)) + +#define GH_SERVICE(fn) ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \ + ARM_SMCCC_OWNER_VENDOR_HYP, \ + GH_FN_ID(GH_CALL_TYPE_SERVICE, fn)) + +#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_FN_ID(GH_CALL_TYPE_HYPERCALL, fn)) + +#define GH_HYPERCALL_HYP_IDENTIFY GH_HYPERCALL(0x0000) + +/** + * gh_hypercall_get_uid() - Returns a UID when running under a Gunyah hypervisor + * @uid: An array of 4 u32's (u32 uid[4];) + * + * Caller should compare the resulting UID to a list of known Gunyah UIDs to + * confirm that Linux is running as a guest of Gunyah. + */ +void gh_hypercall_get_uid(u32 uid[4]) +{ + struct arm_smccc_res res; + + arm_smccc_1_1_hvc(GH_HYPERCALL_CALL_UID, &res); + + uid[0] = res.a0; + uid[1] = res.a1; + uid[2] = res.a2; + uid[3] = res.a3; +} +EXPORT_SYMBOL_GPL(gh_hypercall_get_uid); + +/** + * 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 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/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig new file mode 100644 index 000000000000..127156a678a6 --- /dev/null +++ b/drivers/virt/gunyah/Kconfig @@ -0,0 +1,12 @@ +# SPDX-License-Identifier: GPL-2.0-only + +config GUNYAH + tristate "Gunyah Virtualization drivers" + depends on ARM64 + help + The Gunyah drivers are the helper interfaces that runs 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 824e20a11d27..2765d2b40198 100644 --- a/include/linux/gunyah.h +++ b/include/linux/gunyah.h @@ -6,6 +6,7 @@ #ifndef _GUNYAH_H #define _GUNYAH_H +#include <linux/bitfield.h> #include <linux/types.h> #include <linux/errno.h> @@ -71,4 +72,28 @@ static inline int gh_remap_error(int gh_error) } } +#define GUNYAH_API_V1 1 + +#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) + +#define GH_IDENTIFY_PARTITION_CSPACE BIT_ULL(0) +#define GH_IDENTIFY_DOORBELL BIT_ULL(1) +#define GH_IDENTIFY_MSGQUEUE BIT_ULL(2) +#define GH_IDENTIFY_VIC BIT_ULL(3) +#define GH_IDENTIFY_VPM BIT_ULL(4) +#define GH_IDENTIFY_VCPU BIT_ULL(5) +#define GH_IDENTIFY_MEMEXTENT BIT_ULL(6) +#define GH_IDENTIFY_TRACE_CTRL BIT_ULL(7) + +struct gh_hypercall_hyp_identify_resp { + u64 api_info; + u64 flags[3]; +}; + +void gh_hypercall_get_uid(u32 uid[4]); +void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identity); + #endif -- 2.25.1