| Message ID | 20230304010632.2127470-6-quic_eberman@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | Drivers for gunyah hypervisor | expand |
On 3/3/23 7:06 PM, Elliot Berman wrote: > 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@quicinc.com> Looks good. Reviewed-by: Alex Elder <elder@linaro.org> > --- > drivers/virt/Makefile | 1 + > drivers/virt/gunyah/Makefile | 3 ++ > drivers/virt/gunyah/gunyah.c | 57 ++++++++++++++++++++++++++++++++++++ > 3 files changed, 61 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-$(CONFIG_GUNYAH) += gunyah.o > diff --git a/drivers/virt/gunyah/gunyah.c b/drivers/virt/gunyah/gunyah.c > new file mode 100644 > index 000000000000..4b7e6f3edaff > --- /dev/null > +++ b/drivers/virt/gunyah/gunyah.c > @@ -0,0 +1,57 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. > + */ > + > +#define pr_fmt(fmt) "gunyah: " fmt > + > +#include <linux/gunyah.h> > +#include <linux/init.h> > +#include <linux/module.h> > +#include <linux/printk.h> > + > +static struct gh_hypercall_hyp_identify_resp gh_api; > + > +u16 gh_api_version(void) > +{ > + return FIELD_GET(GH_API_INFO_API_VERSION_MASK, gh_api.api_info); > +} > +EXPORT_SYMBOL_GPL(gh_api_version); > + > +bool gh_api_has_feature(enum gh_api_feature feature) > +{ > + switch (feature) { > + case GH_FEATURE_DOORBELL: > + case GH_FEATURE_MSGQUEUE: > + case GH_FEATURE_VCPU: > + case GH_FEATURE_MEMEXTENT: > + return !!(gh_api.flags[0] & BIT_ULL(feature)); > + default: > + return false; > + } > +} > +EXPORT_SYMBOL_GPL(gh_api_has_feature); > + > +static int __init gh_init(void) > +{ > + if (!arch_is_gh_guest()) > + return -ENODEV; > + > + gh_hypercall_hyp_identify(&gh_api); > + > + pr_info("Running under Gunyah hypervisor %llx/v%u\n", > + FIELD_GET(GH_API_INFO_VARIANT_MASK, gh_api.api_info), > + gh_api_version()); > + > + /* We might move this out to individual drivers if there's ever an API version bump */ > + if (gh_api_version() != GH_API_V1) { > + pr_info("Unsupported Gunyah version: %u\n", gh_api_version()); > + return -ENODEV; > + } > + > + return 0; > +} > +arch_initcall(gh_init); > + > +MODULE_LICENSE("GPL"); > +MODULE_DESCRIPTION("Gunyah Hypervisor Driver");
diff --git a/drivers/virt/Makefile b/drivers/virt/Makefile index e9aa6fc96fab..a5817e2d7d71 100644 --- a/drivers/virt/Makefile +++ b/drivers/virt/Makefile @@ -12,3 +12,4 @@ obj-$(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..4b7e6f3edaff --- /dev/null +++ b/drivers/virt/gunyah/gunyah.c @@ -0,0 +1,57 @@ +// 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 <linux/gunyah.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/printk.h> + +static struct gh_hypercall_hyp_identify_resp gh_api; + +u16 gh_api_version(void) +{ + return FIELD_GET(GH_API_INFO_API_VERSION_MASK, gh_api.api_info); +} +EXPORT_SYMBOL_GPL(gh_api_version); + +bool gh_api_has_feature(enum gh_api_feature feature) +{ + switch (feature) { + case GH_FEATURE_DOORBELL: + case GH_FEATURE_MSGQUEUE: + case GH_FEATURE_VCPU: + case GH_FEATURE_MEMEXTENT: + return !!(gh_api.flags[0] & BIT_ULL(feature)); + default: + return false; + } +} +EXPORT_SYMBOL_GPL(gh_api_has_feature); + +static int __init gh_init(void) +{ + if (!arch_is_gh_guest()) + return -ENODEV; + + gh_hypercall_hyp_identify(&gh_api); + + pr_info("Running under Gunyah hypervisor %llx/v%u\n", + FIELD_GET(GH_API_INFO_VARIANT_MASK, gh_api.api_info), + gh_api_version()); + + /* We might move this out to individual drivers if there's ever an API version bump */ + if (gh_api_version() != GH_API_V1) { + pr_info("Unsupported Gunyah version: %u\n", gh_api_version()); + return -ENODEV; + } + + return 0; +} +arch_initcall(gh_init); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Gunyah Hypervisor Driver");
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@quicinc.com> --- drivers/virt/Makefile | 1 + drivers/virt/gunyah/Makefile | 3 ++ drivers/virt/gunyah/gunyah.c | 57 ++++++++++++++++++++++++++++++++++++ 3 files changed, 61 insertions(+) create mode 100644 drivers/virt/gunyah/Makefile create mode 100644 drivers/virt/gunyah/gunyah.c