[xen staging] IOMMU: have vendor code announce supported page sizes

[patchbot@xxxxxxx]

commit 36992d809dcf052e5c0799769d1d935bae17d882
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Apr 22 14:54:16 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Apr 22 14:54:16 2022 +0200

    IOMMU: have vendor code announce supported page sizes
    
    Generic code will use this information to determine what order values
    can legitimately be passed to the ->{,un}map_page() hooks. For now all
    ops structures simply get to announce 4k mappings (as base page size),
    and there is (and always has been) an assumption that this matches the
    CPU's MMU base page size (eventually we will want to permit IOMMUs with
    a base page size smaller than the CPU MMU's).
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
    Reviewed-by: Rahul Singh <rahul.singh@xxxxxxx>
---
 xen/drivers/passthrough/amd/pci_amd_iommu.c |  1 +
 xen/drivers/passthrough/arm/ipmmu-vmsa.c    |  1 +
 xen/drivers/passthrough/arm/smmu-v3.c       |  3 ++-
 xen/drivers/passthrough/arm/smmu.c          |  1 +
 xen/drivers/passthrough/iommu.c             | 10 ++++++++++
 xen/drivers/passthrough/vtd/iommu.c         |  1 +
 xen/include/xen/iommu.h                     |  1 +
 7 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/amd/pci_amd_iommu.c 
b/xen/drivers/passthrough/amd/pci_amd_iommu.c
index 3430e39a29..8cbbd7c6c9 100644
--- a/xen/drivers/passthrough/amd/pci_amd_iommu.c
+++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c
@@ -746,6 +746,7 @@ static void cf_check amd_dump_page_tables(struct domain *d)
 }
 
 static const struct iommu_ops __initconst_cf_clobber _iommu_ops = {
+    .page_sizes = PAGE_SIZE_4K,
     .init = amd_iommu_domain_init,
     .hwdom_init = amd_iommu_hwdom_init,
     .quarantine_init = amd_iommu_quarantine_init,
diff --git a/xen/drivers/passthrough/arm/ipmmu-vmsa.c 
b/xen/drivers/passthrough/arm/ipmmu-vmsa.c
index d2572bcd30..5a7b332bcc 100644
--- a/xen/drivers/passthrough/arm/ipmmu-vmsa.c
+++ b/xen/drivers/passthrough/arm/ipmmu-vmsa.c
@@ -1355,6 +1355,7 @@ static void ipmmu_iommu_domain_teardown(struct domain *d)
 
 static const struct iommu_ops ipmmu_iommu_ops =
 {
+    .page_sizes      = PAGE_SIZE_4K,
     .init            = ipmmu_iommu_domain_init,
     .hwdom_init      = arch_iommu_hwdom_init,
     .teardown        = ipmmu_iommu_domain_teardown,
diff --git a/xen/drivers/passthrough/arm/smmu-v3.c 
b/xen/drivers/passthrough/arm/smmu-v3.c
index 71b022fe7f..2822ffe05f 100644
--- a/xen/drivers/passthrough/arm/smmu-v3.c
+++ b/xen/drivers/passthrough/arm/smmu-v3.c
@@ -3411,7 +3411,8 @@ static void arm_smmu_iommu_xen_domain_teardown(struct 
domain *d)
 }
 
 static const struct iommu_ops arm_smmu_iommu_ops = {
-       .init           = arm_smmu_iommu_xen_domain_init,
+       .page_sizes             = PAGE_SIZE_4K,
+       .init                   = arm_smmu_iommu_xen_domain_init,
        .hwdom_init             = arch_iommu_hwdom_init,
        .teardown               = arm_smmu_iommu_xen_domain_teardown,
        .iotlb_flush            = arm_smmu_iotlb_flush,
diff --git a/xen/drivers/passthrough/arm/smmu.c 
b/xen/drivers/passthrough/arm/smmu.c
index b186c28dff..5cacb2dd99 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -2858,6 +2858,7 @@ static void arm_smmu_iommu_domain_teardown(struct domain 
*d)
 }
 
 static const struct iommu_ops arm_smmu_iommu_ops = {
+    .page_sizes = PAGE_SIZE_4K,
     .init = arm_smmu_iommu_domain_init,
     .hwdom_init = arch_iommu_hwdom_init,
     .add_device = arm_smmu_dt_add_device_generic,
diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index 73a7da71cd..1109a86532 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -494,7 +494,17 @@ int __init iommu_setup(void)
 
     if ( iommu_enable )
     {
+        const struct iommu_ops *ops = NULL;
+
         rc = iommu_hardware_setup();
+        if ( !rc )
+            ops = iommu_get_ops();
+        if ( ops && (ops->page_sizes & -ops->page_sizes) != PAGE_SIZE )
+        {
+            printk(XENLOG_ERR "IOMMU: page size mask %lx unsupported\n",
+                   ops->page_sizes);
+            rc = ops->page_sizes ? -EPERM : -ENODATA;
+        }
         iommu_enabled = (rc == 0);
     }
 
diff --git a/xen/drivers/passthrough/vtd/iommu.c 
b/xen/drivers/passthrough/vtd/iommu.c
index f68d960d75..cff37c0c31 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -3127,6 +3127,7 @@ static int cf_check intel_iommu_quarantine_init(struct 
pci_dev *pdev,
 }
 
 static const struct iommu_ops __initconst_cf_clobber vtd_ops = {
+    .page_sizes = PAGE_SIZE_4K,
     .init = intel_iommu_domain_init,
     .hwdom_init = intel_iommu_hwdom_init,
     .quarantine_init = intel_iommu_quarantine_init,
diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index 3a83981464..f7e8d5f287 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -231,6 +231,7 @@ struct page_info;
 typedef int iommu_grdm_t(xen_pfn_t start, xen_ulong_t nr, u32 id, void *ctxt);
 
 struct iommu_ops {
+    unsigned long page_sizes;
     int (*init)(struct domain *d);
     void (*hwdom_init)(struct domain *d);
     int (*quarantine_init)(device_t *dev, bool scratch_page);
--
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