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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen master] xen/arm: add generic TEE mediator framework
commit 637d7a395b9d8bc0f0c47137665e1f18e41d83a7
Author: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
AuthorDate: Tue Jun 11 18:46:17 2019 +0000
Commit: Julien Grall <julien.grall@xxxxxxx>
CommitDate: Wed Jun 19 11:53:18 2019 +0100
xen/arm: add generic TEE mediator framework
This patch adds basic framework for TEE mediators. Guests can't talk
to TEE directly, we need some entity that will intercept request
and decide what to do with them. "TEE mediator" is a such entity.
This is how it works: user can build XEN with multiple TEE mediators
(see the next patches, where OP-TEE mediator is introduced).
TEE mediator register self with REGISTER_TEE_MEDIATOR() macro in the
same way, as device drivers use DT_DEVICE_START()/DT_DEVICE_END()
macros.
At run-time, during initialization, framework calls probe() function
for each available mediator driver to find which TEE is installed
on the platform. Then generic vSMC handler will call selected mediator
when it intercept SMC/HVC that belongs to TEE OS or TEE application.
Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
Reviewed-by: Julien Grall <julien.grall@xxxxxxx>
Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
MAINTAINERS | 6 +++
xen/arch/arm/Kconfig | 7 +++
xen/arch/arm/Makefile | 1 +
xen/arch/arm/domain.c | 18 +++++++
xen/arch/arm/setup.c | 2 +
xen/arch/arm/tee/Makefile | 1 +
xen/arch/arm/tee/tee.c | 98 ++++++++++++++++++++++++++++++++++++
xen/arch/arm/vsmc.c | 5 ++
xen/arch/arm/xen.lds.S | 7 +++
xen/include/asm-arm/domain.h | 1 +
xen/include/asm-arm/tee/tee.h | 112 ++++++++++++++++++++++++++++++++++++++++++
xen/include/public/arch-arm.h | 5 ++
12 files changed, 263 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 6fbdc2bdcb..ab32e7f409 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -381,6 +381,12 @@ F: config/Stubdom.mk.in
F: m4/stubdom.m4
F: stubdom/
+TEE MEDIATORS
+M: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
+S: Supported
+F: xen/arch/arm/tee/
+F: xen/include/asm-arm/tee
+
TOOLSTACK
M: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
M: Wei Liu <wl@xxxxxxx>
diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index 585b57f023..caaf377a33 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -106,6 +106,13 @@ config HARDEN_BRANCH_PREDICTOR
If unsure, say Y.
+config TEE
+ bool "Enable TEE mediators support" if EXPERT = "y"
+ default n
+ help
+ This option enables generic TEE mediators support. It allows guests
+ to access real TEE via one of TEE mediators implemented in XEN.
+
endmenu
menu "ARM errata workaround via the alternative framework"
diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 872a155b60..70f532e42a 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -5,6 +5,7 @@ subdir-$(CONFIG_ACPI) += acpi
ifneq ($(CONFIG_NO_PLAT),y)
subdir-y += platforms
endif
+subdir-$(CONFIG_TEE) += tee
obj-$(CONFIG_HAS_ALTERNATIVE) += alternative.o
obj-y += bootfdt.init.o
diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index ef0c656b6f..f84a8ae90e 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -33,6 +33,7 @@
#include <asm/platform.h>
#include <asm/procinfo.h>
#include <asm/regs.h>
+#include <asm/tee/tee.h>
#include <asm/vfp.h>
#include <asm/vgic.h>
#include <asm/vtimer.h>
@@ -648,6 +649,12 @@ int arch_sanitise_domain_config(struct
xen_domctl_createdomain *config)
return -EINVAL;
}
+ if ( config->arch.tee_type != XEN_DOMCTL_CONFIG_TEE_NONE )
+ {
+ dprintk(XENLOG_INFO, "Unsupported TEE type\n");
+ return -EINVAL;
+ }
+
return 0;
}
@@ -705,6 +712,9 @@ int arch_domain_create(struct domain *d,
if ( (rc = domain_vtimer_init(d, &config->arch)) != 0 )
goto fail;
+ if ( (rc = tee_domain_init(d, config->arch.tee_type)) != 0 )
+ goto fail;
+
update_domain_wallclock_time(d);
/*
@@ -949,6 +959,14 @@ int domain_relinquish_resources(struct domain *d)
*/
domain_vpl011_deinit(d);
+ d->arch.relmem = RELMEM_tee;
+ /* Fallthrough */
+
+ case RELMEM_tee:
+ ret = tee_relinquish_resources(d);
+ if (ret )
+ return ret;
+
d->arch.relmem = RELMEM_xen;
/* Fallthrough */
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 2112715579..4156c0ebb3 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -50,6 +50,7 @@
#include <asm/platform.h>
#include <asm/procinfo.h>
#include <asm/setup.h>
+#include <asm/tee/tee.h>
#include <xsm/xsm.h>
#include <asm/acpi.h>
@@ -903,6 +904,7 @@ void __init start_xen(unsigned long boot_phys_offset,
dom0_cfg.arch.nr_spis = min(gic_number_lines(), (unsigned int) 992) - 32;
if ( gic_number_lines() > 992 )
printk(XENLOG_WARNING "Maximum number of vGIC IRQs exceeded.\n");
+ dom0_cfg.arch.tee_type = tee_get_type();
dom0_cfg.max_vcpus = dom0_max_vcpus();
dom0 = domain_create(0, &dom0_cfg, true);
diff --git a/xen/arch/arm/tee/Makefile b/xen/arch/arm/tee/Makefile
new file mode 100644
index 0000000000..c54d4796ff
--- /dev/null
+++ b/xen/arch/arm/tee/Makefile
@@ -0,0 +1 @@
+obj-y += tee.o
diff --git a/xen/arch/arm/tee/tee.c b/xen/arch/arm/tee/tee.c
new file mode 100644
index 0000000000..3964a8a5cd
--- /dev/null
+++ b/xen/arch/arm/tee/tee.c
@@ -0,0 +1,98 @@
+/*
+ * xen/arch/arm/tee/tee.c
+ *
+ * Generic part of TEE mediator subsystem
+ *
+ * Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
+ * Copyright (c) 2018-2019 EPAM Systems.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <xen/errno.h>
+#include <xen/init.h>
+#include <xen/types.h>
+
+#include <asm/tee/tee.h>
+
+extern const struct tee_mediator_desc _steemediator[], _eteemediator[];
+static const struct tee_mediator_desc __read_mostly *cur_mediator;
+
+/*
+ * TODO: Add function to alter Dom0 DTB, so we can properly describe
+ * present TEE.
+ */
+
+bool tee_handle_call(struct cpu_user_regs *regs)
+{
+ if ( unlikely(!cur_mediator) )
+ return false;
+
+ return cur_mediator->ops->handle_call(regs);
+}
+
+int tee_domain_init(struct domain *d, uint16_t tee_type)
+{
+ if ( tee_type == XEN_DOMCTL_CONFIG_TEE_NONE )
+ return 0;
+
+ if ( !cur_mediator )
+ return -ENODEV;
+
+ if ( cur_mediator->tee_type != tee_type )
+ return -EINVAL;
+
+ return cur_mediator->ops->domain_init(d);
+}
+
+int tee_relinquish_resources(struct domain *d)
+{
+ if ( !cur_mediator )
+ return 0;
+
+ return cur_mediator->ops->relinquish_resources(d);
+}
+
+uint16_t tee_get_type(void)
+{
+ if ( !cur_mediator )
+ return XEN_DOMCTL_CONFIG_TEE_NONE;
+
+ return cur_mediator->tee_type;
+}
+
+
+static int __init tee_init(void)
+{
+ const struct tee_mediator_desc *desc;
+
+ for ( desc = _steemediator; desc != _eteemediator; desc++ )
+ {
+ if ( desc->ops->probe() )
+ {
+ printk(XENLOG_INFO "Using TEE mediator for %s\n", desc->name);
+ cur_mediator = desc;
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+__initcall(tee_init);
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/vsmc.c b/xen/arch/arm/vsmc.c
index c72b9a04ff..f8e350311d 100644
--- a/xen/arch/arm/vsmc.c
+++ b/xen/arch/arm/vsmc.c
@@ -23,6 +23,7 @@
#include <asm/monitor.h>
#include <asm/regs.h>
#include <asm/smccc.h>
+#include <asm/tee/tee.h>
#include <asm/traps.h>
#include <asm/vpsci.h>
#include <asm/platform.h>
@@ -276,6 +277,10 @@ static bool vsmccc_handle_call(struct cpu_user_regs *regs)
case ARM_SMCCC_OWNER_SIP:
handled = platform_smc(regs);
break;
+ case ARM_SMCCC_OWNER_TRUSTED_APP ... ARM_SMCCC_OWNER_TRUSTED_APP_END:
+ case ARM_SMCCC_OWNER_TRUSTED_OS ... ARM_SMCCC_OWNER_TRUSTED_OS_END:
+ handled = tee_handle_call(regs);
+ break;
}
}
diff --git a/xen/arch/arm/xen.lds.S b/xen/arch/arm/xen.lds.S
index 1e72906477..e664c4441a 100644
--- a/xen/arch/arm/xen.lds.S
+++ b/xen/arch/arm/xen.lds.S
@@ -137,6 +137,13 @@ SECTIONS
_aedevice = .;
} :text
+ . = ALIGN(8);
+ .teemediator.info : {
+ _steemediator = .;
+ *(.teemediator.info)
+ _eteemediator = .;
+ } :text
+
. = ALIGN(PAGE_SIZE); /* Init code and data */
__init_begin = .;
.init.text : {
diff --git a/xen/include/asm-arm/domain.h b/xen/include/asm-arm/domain.h
index 312fec8932..0f15372098 100644
--- a/xen/include/asm-arm/domain.h
+++ b/xen/include/asm-arm/domain.h
@@ -58,6 +58,7 @@ struct arch_domain
/* Continuable domain_relinquish_resources(). */
enum {
RELMEM_not_started,
+ RELMEM_tee,
RELMEM_xen,
RELMEM_page,
RELMEM_mapping,
diff --git a/xen/include/asm-arm/tee/tee.h b/xen/include/asm-arm/tee/tee.h
new file mode 100644
index 0000000000..f483986385
--- /dev/null
+++ b/xen/include/asm-arm/tee/tee.h
@@ -0,0 +1,112 @@
+/*
+ * xen/include/asm-arm/tee/tee.h
+ *
+ * Generic part of TEE mediator subsystem
+ *
+ * Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
+ * Copyright (c) 2018 EPAM Systems.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ARCH_ARM_TEE_TEE_H__
+#define __ARCH_ARM_TEE_TEE_H__
+
+#include <xen/lib.h>
+#include <xen/types.h>
+
+#include <asm/regs.h>
+
+#ifdef CONFIG_TEE
+
+struct tee_mediator_ops {
+ /*
+ * Probe for TEE. Should return true if TEE found and
+ * mediator is initialized.
+ */
+ bool (*probe)(void);
+
+ /*
+ * Called during domain construction if toolstack requests to enable
+ * TEE support so mediator can inform TEE about new
+ * guest and create own structures for the new domain.
+ */
+ int (*domain_init)(struct domain *d);
+
+ /*
+ * Called during domain destruction to relinquish resources used
+ * by mediator itself. This function can return -ERESTART to indicate
+ * that it does not finished work and should be called again.
+ */
+ int (*relinquish_resources)(struct domain *d);
+
+ /* Handle SMCCC call for current domain. */
+ bool (*handle_call)(struct cpu_user_regs *regs);
+};
+
+struct tee_mediator_desc {
+ /* Printable name of the TEE. */
+ const char *name;
+
+ /* Mediator callbacks as described above. */
+ const struct tee_mediator_ops *ops;
+
+ /*
+ * ID of TEE. Corresponds to xen_arch_domainconfig.tee_type.
+ * Should be one of XEN_DOMCTL_CONFIG_TEE_xxx
+ */
+ uint16_t tee_type;
+};
+
+bool tee_handle_call(struct cpu_user_regs *regs);
+int tee_domain_init(struct domain *d, uint16_t tee_type);
+int tee_relinquish_resources(struct domain *d);
+uint16_t tee_get_type(void);
+
+#define REGISTER_TEE_MEDIATOR(_name, _namestr, _type, _ops) \
+static const struct tee_mediator_desc __tee_desc_##_name __used \
+__section(".teemediator.info") = { \
+ .name = _namestr, \
+ .ops = _ops, \
+ .tee_type = _type \
+}
+
+#else
+
+static inline bool tee_handle_call(struct cpu_user_regs *regs)
+{
+ return false;
+}
+
+static inline int tee_domain_init(struct domain *d, uint16_t tee_type)
+{
+ if ( likely(tee_type == XEN_DOMCTL_CONFIG_TEE_NONE) )
+ return 0;
+
+ return -ENODEV;
+}
+
+static inline int tee_relinquish_resources(struct domain *d)
+{
+ return 0;
+}
+
+static inline uint16_t tee_get_type(void)
+{
+ return XEN_DOMCTL_CONFIG_TEE_NONE;
+}
+
+#endif /* CONFIG_TEE */
+
+#endif /* __ARCH_ARM_TEE_TEE_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/public/arch-arm.h b/xen/include/public/arch-arm.h
index eb424e8286..bb69c380ec 100644
--- a/xen/include/public/arch-arm.h
+++ b/xen/include/public/arch-arm.h
@@ -304,10 +304,15 @@ DEFINE_XEN_GUEST_HANDLE(vcpu_guest_context_t);
#define XEN_DOMCTL_CONFIG_GIC_NATIVE 0
#define XEN_DOMCTL_CONFIG_GIC_V2 1
#define XEN_DOMCTL_CONFIG_GIC_V3 2
+
+#define XEN_DOMCTL_CONFIG_TEE_NONE 0
+
struct xen_arch_domainconfig {
/* IN/OUT */
uint8_t gic_version;
/* IN */
+ uint16_t tee_type;
+ /* IN */
uint32_t nr_spis;
/*
* OUT
--
generated by git-patchbot for /home/xen/git/xen.git#master
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