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 <quic_eberman@xxxxxxxxxxx> --- drivers/virt/Makefile | 1 + drivers/virt/gunyah/Makefile | 1 + drivers/virt/gunyah/gunyah.c | 46 ++++++++++++++++++++++++++++++++++++ include/linux/gunyah.h | 6 +++++ 4 files changed, 54 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 093674e05c40..92b7e5311548 100644 --- a/drivers/virt/Makefile +++ b/drivers/virt/Makefile @@ -11,3 +11,4 @@ obj-$(CONFIG_NITRO_ENCLAVES) += nitro_enclaves/ obj-$(CONFIG_ACRN_HSM) += acrn/ obj-$(CONFIG_EFI_SECRET) += coco/efi_secret/ obj-$(CONFIG_SEV_GUEST) += coco/sev-guest/ +obj-y += gunyah/ diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile new file mode 100644 index 000000000000..2ac4ee64b89d --- /dev/null +++ b/drivers/virt/gunyah/Makefile @@ -0,0 +1 @@ +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..c34c9046fc08 --- /dev/null +++ b/drivers/virt/gunyah/gunyah.c @@ -0,0 +1,46 @@ +// 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/gunyah.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/printk.h> + +struct gh_hypercall_hyp_identify_resp gunyah_api; +EXPORT_SYMBOL_GPL(gunyah_api); + +static const uint32_t gunyah_known_uuids[][4] = { + {0x19bd54bd, 0x0b37571b, 0x946f609b, 0x54539de6}, /* QC_HYP (Qualcomm's build) */ + {0x673d5f14, 0x9265ce36, 0xa4535fdb, 0xc1d58fcd}, /* GUNYAH (open source build) */ +}; + +static int __init gunyah_init(void) +{ + u32 uid[4]; + int i; + + gh_hypercall_get_uid(uid); + + for (i = 0; i < ARRAY_SIZE(gunyah_known_uuids); i++) + if (!memcmp(uid, gunyah_known_uuids[i], sizeof(uid))) + break; + + if (i == ARRAY_SIZE(gunyah_known_uuids)) + 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"); diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h index 2765d2b40198..166156f69df9 100644 --- a/include/linux/gunyah.h +++ b/include/linux/gunyah.h @@ -92,6 +92,12 @@ struct gh_hypercall_hyp_identify_resp { u64 api_info; u64 flags[3]; }; +extern struct gh_hypercall_hyp_identify_resp gunyah_api; + +static inline u16 gh_api_version(void) +{ + return FIELD_GET(GH_API_INFO_API_VERSION_MASK, gunyah_api.api_info); +} void gh_hypercall_get_uid(u32 uid[4]); void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identity); -- 2.25.1