@@ -63,6 +63,7 @@ type domain_create_flag =
| CDF_S3_INTEGRITY
| CDF_OOS_OFF
| CDF_XS_DOMAIN
+ | CDF_IOMMU
type domctl_create_config =
{
@@ -56,6 +56,7 @@ type domain_create_flag =
| CDF_S3_INTEGRITY
| CDF_OOS_OFF
| CDF_XS_DOMAIN
+ | CDF_IOMMU
type domctl_create_config = {
ssidref: int32;
@@ -608,9 +608,12 @@ int arch_sanitise_domain_config(struct xen_domctl_createdomain *config)
{
unsigned int max_vcpus;
- if ( config->flags != (XEN_DOMCTL_CDF_hvm | XEN_DOMCTL_CDF_hap) )
+ /* HVM and HAP must be set. IOMMU may or may not be */
+ if ( (config->flags & ~XEN_DOMCTL_CDF_iommu) !=
+ (XEN_DOMCTL_CDF_hvm | XEN_DOMCTL_CDF_hap) )
{
- dprintk(XENLOG_INFO, "Unsupported configuration %#x\n", config->flags);
+ dprintk(XENLOG_INFO, "Unsupported configuration %#x\n",
+ config->flags);
return -EINVAL;
}
@@ -961,6 +961,9 @@ void __init start_xen(unsigned long boot_phys_offset,
dom0_cfg.arch.tee_type = tee_get_type();
dom0_cfg.max_vcpus = dom0_max_vcpus();
+ if ( iommu_enabled )
+ dom0_cfg.flags |= XEN_DOMCTL_CDF_iommu;
+
dom0 = domain_create(0, &dom0_cfg, true);
if ( IS_ERR(dom0) || (alloc_dom0_vcpu0(dom0) == NULL) )
panic("Error creating domain 0\n");
@@ -1732,6 +1732,9 @@ void __init noreturn __start_xen(unsigned long mbi_p)
}
dom0_cfg.max_vcpus = dom0_max_vcpus();
+ if ( iommu_enabled )
+ dom0_cfg.flags |= XEN_DOMCTL_CDF_iommu;
+
/* Create initial domain 0. */
dom0 = domain_create(get_initial_domain_id(), &dom0_cfg, !pv_shim);
if ( IS_ERR(dom0) || (alloc_dom0_vcpu0(dom0) == NULL) )
@@ -301,7 +301,8 @@ static int sanitise_domain_config(struct xen_domctl_createdomain *config)
XEN_DOMCTL_CDF_hap |
XEN_DOMCTL_CDF_s3_integrity |
XEN_DOMCTL_CDF_oos_off |
- XEN_DOMCTL_CDF_xs_domain) )
+ XEN_DOMCTL_CDF_xs_domain |
+ XEN_DOMCTL_CDF_iommu) )
{
dprintk(XENLOG_INFO, "Unknown CDF flags %#x\n", config->flags);
return -EINVAL;
@@ -320,6 +321,12 @@ static int sanitise_domain_config(struct xen_domctl_createdomain *config)
return -EINVAL;
}
+ if ( (config->flags & XEN_DOMCTL_CDF_iommu) && !iommu_enabled )
+ {
+ dprintk(XENLOG_INFO, "IOMMU is not enabled\n");
+ return -EINVAL;
+ }
+
return arch_sanitise_domain_config(config);
}
@@ -515,6 +515,19 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl)
rover = dom;
}
+ /*
+ * For now, make sure the createdomain IOMMU flag is set if the
+ * IOMMU is enabled. When the flag comes under toolstack control
+ * this can go away.
+ */
+ if ( op->u.createdomain.flags & XEN_DOMCTL_CDF_iommu )
+ {
+ ASSERT_UNREACHABLE();
+ return -EINVAL;
+ }
+ if ( iommu_enabled )
+ op->u.createdomain.flags |= XEN_DOMCTL_CDF_iommu;
+
d = domain_create(dom, &op->u.createdomain, false);
if ( IS_ERR(d) )
{
@@ -119,6 +119,9 @@ int iommu_release_dt_devices(struct domain *d)
struct dt_device_node *dev, *_dev;
int rc;
+ if ( !is_iommu_enabled(d) )
+ return 0;
+
list_for_each_entry_safe(dev, _dev, &hd->dt_devices, domain_list)
{
rc = iommu_deassign_dt_device(d, dev);
@@ -151,6 +151,9 @@ int iommu_domain_init(struct domain *d)
struct domain_iommu *hd = dom_iommu(d);
int ret = 0;
+ if ( !is_iommu_enabled(d) )
+ return 0;
+
#ifdef CONFIG_NUMA
hd->node = NUMA_NO_NODE;
#endif
@@ -159,9 +162,6 @@ int iommu_domain_init(struct domain *d)
if ( ret )
return ret;
- if ( !iommu_enabled )
- return 0;
-
hd->platform_ops = iommu_get_ops();
return hd->platform_ops->init(d);
}
@@ -64,9 +64,12 @@ struct xen_domctl_createdomain {
/* Is this a xenstore domain? */
#define _XEN_DOMCTL_CDF_xs_domain 4
#define XEN_DOMCTL_CDF_xs_domain (1U<<_XEN_DOMCTL_CDF_xs_domain)
+ /* Should this domain be permitted to use the IOMMU? */
+#define _XEN_DOMCTL_CDF_iommu 5
+#define XEN_DOMCTL_CDF_iommu (1U<<_XEN_DOMCTL_CDF_iommu)
/* Max XEN_DOMCTL_CDF_* constant. Used for ABI checking. */
-#define XEN_DOMCTL_CDF_MAX XEN_DOMCTL_CDF_xs_domain
+#define XEN_DOMCTL_CDF_MAX XEN_DOMCTL_CDF_iommu
uint32_t flags;
@@ -983,6 +983,11 @@ static inline bool is_xenstore_domain(const struct domain *d)
return d->options & XEN_DOMCTL_CDF_xs_domain;
}
+static inline bool is_iommu_enabled(const struct domain *d)
+{
+ return evaluate_nospec(d->options & XEN_DOMCTL_CDF_iommu);
+}
+
extern bool sched_smt_power_savings;
extern enum cpufreq_controller {
This patch introduces a common domain creation flag to determine whether the domain is permitted to make use of the IOMMU. Currently the flag is always set for both dom0 and any domU created by libxl if the IOMMU is globally enabled (i.e. iommu_enabled == 1). sanitise_domain_config() is modified to reject the flag if !iommu_enabled. A new helper function, is_iommu_enabled(), is added to test the flag and iommu_domain_init() will return immediately if !is_iommu_enabled(). This is slightly different to the previous behaviour based on !iommu_enabled where the call to arch_iommu_domain_init() was made regardless, however it appears that this call was only necessary to initialize the dt_devices list for ARM such that iommu_release_dt_devices() can be called unconditionally by domain_relinquish_resources(). Adding a simple check of is_iommu_enabled() into iommu_release_dt_devices() keeps this unconditional call working. No functional change should be observed with this patch applied. Subsequent patches will allow the toolstack to control whether use of the IOMMU is enabled for a domain. NOTE: The introduction of the is_iommu_enabled() helper function might seem excessive but its use is expected to increase with subsequent patches. Also, having iommu_domain_init() bail before calling arch_iommu_domain_init() is not strictly necessary, but I think the consequent addition of the call to is_iommu_enabled() in iommu_release_dt_devices() makes the code clearer. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Reviewed-by: "Roger Pau Monné" <roger.pau@citrix.com> Acked-by: Jan Beulich <jbeulich@suse.com> Acked-by: Christian Lindig <christian.lindig@citrix.com> --- Cc: David Scott <dave@recoil.org> Cc: Ian Jackson <ian.jackson@eu.citrix.com> Cc: Wei Liu <wl@xen.org> Cc: Andrew Cooper <andrew.cooper3@citrix.com> Cc: George Dunlap <George.Dunlap@eu.citrix.com> Cc: Julien Grall <julien.grall@arm.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Stefano Stabellini <sstabellini@kernel.org> Cc: Tim Deegan <tim@xen.org> Cc: Volodymyr Babchuk <Volodymyr_Babchuk@epam.com> Previously part of series https://lists.xenproject.org/archives/html/xen-devel/2019-07/msg02267.html v9: - Fix oversight in ARM's arch_sanitise_domain_config() to tolerate setting of XEN_DOMCTL_CDF_iommu v7: - Add a check to verify that the toolstack has not set XEN_DOMCTL_CDF_iommu - Add missing ocaml binding changes v6: - Remove the toolstack parts as there's no nice method of testing whether the IOMMU is enabled in an architecture-neutral way v5: - Move is_iommu_enabled() check into iommu_domain_init() - Reject XEN_DOMCTL_CDF_iommu in sanitise_domain_config() if !iommu_enabled - Use evaluate_nospec() in defintion of is_iommu_enabled() --- tools/ocaml/libs/xc/xenctrl.ml | 1 + tools/ocaml/libs/xc/xenctrl.mli | 1 + xen/arch/arm/domain.c | 7 +++++-- xen/arch/arm/setup.c | 3 +++ xen/arch/x86/setup.c | 3 +++ xen/common/domain.c | 9 ++++++++- xen/common/domctl.c | 13 +++++++++++++ xen/drivers/passthrough/device_tree.c | 3 +++ xen/drivers/passthrough/iommu.c | 6 +++--- xen/include/public/domctl.h | 5 ++++- xen/include/xen/sched.h | 5 +++++ 11 files changed, 49 insertions(+), 7 deletions(-)