[Xen-changelog] [xen staging] IOMMU/x86: remove indirection from certain IOMMU hook accesses

[patchbot@xxxxxxx]

commit 32a5ea00ec75ef53e1f5e095786a34f98fd2e22b
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Nov 15 13:34:21 2018 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Nov 15 13:34:21 2018 +0100

    IOMMU/x86: remove indirection from certain IOMMU hook accesses
    
    There's no need to go through an extra level of indirection. In order to
    limit code churn, call sites using struct domain_iommu's platform_ops
    don't get touched here, however.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    Acked-by: Brian Woods <brian.woods@xxxxxxx>
---
 xen/drivers/passthrough/amd/pci_amd_iommu.c |  6 +++++-
 xen/drivers/passthrough/vtd/extern.h        |  1 +
 xen/drivers/passthrough/vtd/intremap.c      |  2 ++
 xen/drivers/passthrough/vtd/iommu.c         |  4 +++-
 xen/drivers/passthrough/x86/iommu.c         |  2 ++
 xen/include/asm-x86/iommu.h                 | 17 ++++-------------
 6 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/xen/drivers/passthrough/amd/pci_amd_iommu.c 
b/xen/drivers/passthrough/amd/pci_amd_iommu.c
index d3909daa8d..900136390d 100644
--- a/xen/drivers/passthrough/amd/pci_amd_iommu.c
+++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c
@@ -29,6 +29,8 @@
 
 static bool_t __read_mostly init_done;
 
+static const struct iommu_ops amd_iommu_ops;
+
 struct amd_iommu *find_iommu_for_device(int seg, int bdf)
 {
     struct ivrs_mappings *ivrs_mappings = get_ivrs_mappings(seg);
@@ -182,6 +184,8 @@ int __init amd_iov_detect(void)
         return -ENODEV;
     }
 
+    iommu_ops = amd_iommu_ops;
+
     if ( amd_iommu_init() != 0 )
     {
         printk("AMD-Vi: Error initialization\n");
@@ -566,7 +570,7 @@ static void amd_dump_p2m_table(struct domain *d)
     amd_dump_p2m_table_level(hd->arch.root_table, hd->arch.paging_mode, 0, 0);
 }
 
-const struct iommu_ops amd_iommu_ops = {
+static const struct iommu_ops __initconstrel amd_iommu_ops = {
     .init = amd_iommu_domain_init,
     .hwdom_init = amd_iommu_hwdom_init,
     .add_device = amd_iommu_add_device,
diff --git a/xen/drivers/passthrough/vtd/extern.h 
b/xen/drivers/passthrough/vtd/extern.h
index 91cadc602e..16eada9fa2 100644
--- a/xen/drivers/passthrough/vtd/extern.h
+++ b/xen/drivers/passthrough/vtd/extern.h
@@ -27,6 +27,7 @@
 
 struct pci_ats_dev;
 extern bool_t rwbf_quirk;
+extern const struct iommu_ops intel_iommu_ops;
 
 void print_iommu_regs(struct acpi_drhd_unit *drhd);
 void print_vtd_entries(struct iommu *iommu, int bus, int devfn, u64 gmfn);
diff --git a/xen/drivers/passthrough/vtd/intremap.c 
b/xen/drivers/passthrough/vtd/intremap.c
index 1e0317c47a..a0663ecd22 100644
--- a/xen/drivers/passthrough/vtd/intremap.c
+++ b/xen/drivers/passthrough/vtd/intremap.c
@@ -897,6 +897,8 @@ int iommu_enable_x2apic_IR(void)
     else if ( !x2apic_enabled )
         return -EOPNOTSUPP;
 
+    iommu_ops = intel_iommu_ops;
+
     for_each_drhd_unit ( drhd )
     {
         iommu = drhd->iommu;
diff --git a/xen/drivers/passthrough/vtd/iommu.c 
b/xen/drivers/passthrough/vtd/iommu.c
index 4d1ff10817..1601278b07 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -2299,6 +2299,8 @@ int __init intel_vtd_setup(void)
         goto error;
     }
 
+    iommu_ops = intel_iommu_ops;
+
     /* We enable the following features only if they are supported by all VT-d
      * engines: Snoop Control, DMA passthrough, Queued Invalidation, Interrupt
      * Remapping, and Posted Interrupt
@@ -2698,7 +2700,7 @@ static void vtd_dump_p2m_table(struct domain *d)
     vtd_dump_p2m_table_level(hd->arch.pgd_maddr, agaw_to_level(hd->arch.agaw), 
0, 0);
 }
 
-const struct iommu_ops intel_iommu_ops = {
+const struct iommu_ops __initconstrel intel_iommu_ops = {
     .init = intel_iommu_domain_init,
     .hwdom_init = intel_iommu_hwdom_init,
     .add_device = intel_iommu_add_device,
diff --git a/xen/drivers/passthrough/x86/iommu.c 
b/xen/drivers/passthrough/x86/iommu.c
index b20bad17de..e488889071 100644
--- a/xen/drivers/passthrough/x86/iommu.c
+++ b/xen/drivers/passthrough/x86/iommu.c
@@ -23,6 +23,8 @@
 #include <asm/hvm/io.h>
 #include <asm/setup.h>
 
+struct iommu_ops iommu_ops;
+
 void iommu_update_ire_from_apic(
     unsigned int apic, unsigned int reg, unsigned int value)
 {
diff --git a/xen/include/asm-x86/iommu.h b/xen/include/asm-x86/iommu.h
index fa37b0539b..8dc392473d 100644
--- a/xen/include/asm-x86/iommu.h
+++ b/xen/include/asm-x86/iommu.h
@@ -56,24 +56,15 @@ struct arch_iommu
     struct guest_iommu *g_iommu;
 };
 
-extern const struct iommu_ops intel_iommu_ops;
-extern const struct iommu_ops amd_iommu_ops;
 int intel_vtd_setup(void);
 int amd_iov_detect(void);
 
+extern struct iommu_ops iommu_ops;
+
 static inline const struct iommu_ops *iommu_get_ops(void)
 {
-    switch ( boot_cpu_data.x86_vendor )
-    {
-    case X86_VENDOR_INTEL:
-        return &intel_iommu_ops;
-    case X86_VENDOR_AMD:
-        return &amd_iommu_ops;
-    }
-
-    BUG();
-
-    return NULL;
+    BUG_ON(!iommu_ops.init);
+    return &iommu_ops;
 }
 
 static inline int iommu_hardware_setup(void)
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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