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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [RFC PATCH 04/21] xen/arm: vIOMMU: add generic vIOMMU framework
This patch adds basic framework for vIOMMU.
Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
---
xen/arch/arm/domain.c | 17 +++++++
xen/arch/arm/domain_build.c | 3 ++
xen/arch/arm/include/asm/viommu.h | 70 ++++++++++++++++++++++++++++
xen/drivers/passthrough/Kconfig | 6 +++
xen/drivers/passthrough/arm/Makefile | 1 +
xen/drivers/passthrough/arm/viommu.c | 48 +++++++++++++++++++
xen/include/public/arch-arm.h | 4 ++
7 files changed, 149 insertions(+)
create mode 100644 xen/arch/arm/include/asm/viommu.h
create mode 100644 xen/drivers/passthrough/arm/viommu.c
diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index 38e22f12af..2a85209736 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -37,6 +37,7 @@
#include <asm/tee/tee.h>
#include <asm/vfp.h>
#include <asm/vgic.h>
+#include <asm/viommu.h>
#include <asm/vtimer.h>
#include "vpci.h"
@@ -691,6 +692,13 @@ int arch_sanitise_domain_config(struct
xen_domctl_createdomain *config)
return -EINVAL;
}
+ if ( config->arch.viommu_type != XEN_DOMCTL_CONFIG_VIOMMU_NONE )
+ {
+ dprintk(XENLOG_INFO,
+ "vIOMMU type requested not supported by the platform or
Xen\n");
+ return -EINVAL;
+ }
+
return 0;
}
@@ -783,6 +791,9 @@ int arch_domain_create(struct domain *d,
if ( (rc = domain_vpci_init(d)) != 0 )
goto fail;
+ if ( (rc = domain_viommu_init(d, config->arch.viommu_type)) != 0 )
+ goto fail;
+
return 0;
fail:
@@ -998,6 +1009,7 @@ static int relinquish_memory(struct domain *d, struct
page_list_head *list)
enum {
PROG_pci = 1,
PROG_tee,
+ PROG_viommu,
PROG_xen,
PROG_page,
PROG_mapping,
@@ -1048,6 +1060,11 @@ int domain_relinquish_resources(struct domain *d)
if (ret )
return ret;
+ PROGRESS(viommu):
+ ret = viommu_relinquish_resources(d);
+ if (ret )
+ return ret;
+
PROGRESS(xen):
ret = relinquish_memory(d, &d->xenpage_list);
if ( ret )
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index bd30d3798c..abbaf37a2e 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -27,6 +27,7 @@
#include <asm/setup.h>
#include <asm/cpufeature.h>
#include <asm/domain_build.h>
+#include <asm/viommu.h>
#include <xen/event.h>
#include <xen/irq.h>
@@ -3858,6 +3859,7 @@ void __init create_domUs(void)
struct domain *d;
struct xen_domctl_createdomain d_cfg = {
.arch.gic_version = XEN_DOMCTL_CONFIG_GIC_NATIVE,
+ .arch.viommu_type = viommu_get_type(),
.flags = XEN_DOMCTL_CDF_hvm | XEN_DOMCTL_CDF_hap,
/*
* The default of 1023 should be sufficient for guests because
@@ -4052,6 +4054,7 @@ void __init create_dom0(void)
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_cfg.arch.viommu_type = viommu_get_type();
if ( iommu_enabled )
dom0_cfg.flags |= XEN_DOMCTL_CDF_iommu;
diff --git a/xen/arch/arm/include/asm/viommu.h
b/xen/arch/arm/include/asm/viommu.h
new file mode 100644
index 0000000000..7cd3818a12
--- /dev/null
+++ b/xen/arch/arm/include/asm/viommu.h
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
+#ifndef __ARCH_ARM_VIOMMU_H__
+#define __ARCH_ARM_VIOMMU_H__
+
+#ifdef CONFIG_VIRTUAL_IOMMU
+
+#include <xen/lib.h>
+#include <xen/types.h>
+#include <public/xen.h>
+
+struct viommu_ops {
+ /*
+ * Called during domain construction if toolstack requests to enable
+ * vIOMMU support.
+ */
+ int (*domain_init)(struct domain *d);
+
+ /*
+ * Called during domain destruction to free resources used by vIOMMU.
+ */
+ int (*relinquish_resources)(struct domain *d);
+};
+
+struct viommu_desc {
+ /* vIOMMU domains init/free operations described above. */
+ const struct viommu_ops *ops;
+
+ /*
+ * ID of vIOMMU. Corresponds to xen_arch_domainconfig.viommu_type.
+ * Should be one of XEN_DOMCTL_CONFIG_VIOMMU_xxx
+ */
+ uint16_t viommu_type;
+};
+
+int domain_viommu_init(struct domain *d, uint16_t viommu_type);
+int viommu_relinquish_resources(struct domain *d);
+uint16_t viommu_get_type(void);
+
+#else
+
+static inline uint8_t viommu_get_type(void)
+{
+ return XEN_DOMCTL_CONFIG_VIOMMU_NONE;
+}
+
+static inline int domain_viommu_init(struct domain *d, uint16_t viommu_type)
+{
+ if ( likely(viommu_type == XEN_DOMCTL_CONFIG_VIOMMU_NONE) )
+ return 0;
+
+ return -ENODEV;
+}
+
+static inline int viommu_relinquish_resources(struct domain *d)
+{
+ return 0;
+}
+
+#endif /* CONFIG_VIRTUAL_IOMMU */
+
+#endif /* __ARCH_ARM_VIOMMU_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/drivers/passthrough/Kconfig b/xen/drivers/passthrough/Kconfig
index 479d7de57a..19924fa2de 100644
--- a/xen/drivers/passthrough/Kconfig
+++ b/xen/drivers/passthrough/Kconfig
@@ -35,6 +35,12 @@ config IPMMU_VMSA
(H3 ES3.0, M3-W+, etc) or Gen4 SoCs which IPMMU hardware supports
stage 2
translation table format and is able to use CPU's P2M table as is.
+config VIRTUAL_IOMMU
+ bool "Virtual IOMMU Support (UNSUPPORTED)" if UNSUPPORTED
+ default n
+ help
+ Support virtual IOMMU infrastructure to implement vIOMMU.
+
endif
config IOMMU_FORCE_PT_SHARE
diff --git a/xen/drivers/passthrough/arm/Makefile
b/xen/drivers/passthrough/arm/Makefile
index c5fb3b58a5..4cc54f3f4d 100644
--- a/xen/drivers/passthrough/arm/Makefile
+++ b/xen/drivers/passthrough/arm/Makefile
@@ -2,3 +2,4 @@ obj-y += iommu.o iommu_helpers.o iommu_fwspec.o
obj-$(CONFIG_ARM_SMMU) += smmu.o
obj-$(CONFIG_IPMMU_VMSA) += ipmmu-vmsa.o
obj-$(CONFIG_ARM_SMMU_V3) += smmu-v3.o
+obj-$(CONFIG_VIRTUAL_IOMMU) += viommu.o
diff --git a/xen/drivers/passthrough/arm/viommu.c
b/xen/drivers/passthrough/arm/viommu.c
new file mode 100644
index 0000000000..7ab6061e34
--- /dev/null
+++ b/xen/drivers/passthrough/arm/viommu.c
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
+
+#include <xen/errno.h>
+#include <xen/init.h>
+#include <xen/types.h>
+
+#include <asm/viommu.h>
+
+const struct viommu_desc __read_mostly *cur_viommu;
+
+int domain_viommu_init(struct domain *d, uint16_t viommu_type)
+{
+ if ( viommu_type == XEN_DOMCTL_CONFIG_VIOMMU_NONE )
+ return 0;
+
+ if ( !cur_viommu )
+ return -ENODEV;
+
+ if ( cur_viommu->viommu_type != viommu_type )
+ return -EINVAL;
+
+ return cur_viommu->ops->domain_init(d);
+}
+
+int viommu_relinquish_resources(struct domain *d)
+{
+ if ( !cur_viommu )
+ return 0;
+
+ return cur_viommu->ops->relinquish_resources(d);
+}
+
+uint16_t viommu_get_type(void)
+{
+ if ( !cur_viommu )
+ return XEN_DOMCTL_CONFIG_VIOMMU_NONE;
+
+ return cur_viommu->viommu_type;
+}
+
+/*
+ * 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 1528ced509..33d32835e7 100644
--- a/xen/include/public/arch-arm.h
+++ b/xen/include/public/arch-arm.h
@@ -297,10 +297,14 @@ DEFINE_XEN_GUEST_HANDLE(vcpu_guest_context_t);
#define XEN_DOMCTL_CONFIG_TEE_NONE 0
#define XEN_DOMCTL_CONFIG_TEE_OPTEE 1
+#define XEN_DOMCTL_CONFIG_VIOMMU_NONE 0
+
struct xen_arch_domainconfig {
/* IN/OUT */
uint8_t gic_version;
/* IN */
+ uint8_t viommu_type;
+ /* IN */
uint16_t tee_type;
/* IN */
uint32_t nr_spis;
--
2.25.1
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