[Xen-devel] [PATCH v5 09/10] iommu: tidy up iommu_use_hap_pt() and need_iommu_pt_sync() macros

[Paul Durrant <paul.durrant@citrix.com>]

Thes macros really ought to live in the common xen/iommu.h header rather
then being distributed amongst architecture specific iommu headers and
xen/sched.h. This patch moves them there.

NOTE: Disabling 'sharept' in the command line iommu options should really
      be hard error on ARM (as opposed to just being ignored), so avoid
      parsing that option if CONFIG_ARM is set.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
---
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@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: Wei Liu <wl@xen.org>
Cc: Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
Cc: "Roger Pau Monné" <roger.pau@citrix.com>

Previously part of https://lists.xenproject.org/archives/html/xen-devel/2019-07/msg02267.html
---
 xen/drivers/passthrough/iommu.c |  2 ++
 xen/include/asm-arm/iommu.h     |  3 ---
 xen/include/asm-x86/iommu.h     |  4 ----
 xen/include/xen/iommu.h         | 11 +++++++++++
 xen/include/xen/sched.h         |  6 ------
 5 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index 91572aae56..965740f6f7 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -102,8 +102,10 @@ static int __init parse_iommu_param(const char *s)
             iommu_hwdom_passthrough = val;
         else if ( (val = parse_boolean("dom0-strict", s, ss)) >= 0 )
             iommu_hwdom_strict = val;
+#ifndef CONFIG_ARM
         else if ( (val = parse_boolean("sharept", s, ss)) >= 0 )
             iommu_hap_pt_share = val;
+#endif
         else
             rc = -EINVAL;
 
diff --git a/xen/include/asm-arm/iommu.h b/xen/include/asm-arm/iommu.h
index 1577e83d2b..77a94b29eb 100644
--- a/xen/include/asm-arm/iommu.h
+++ b/xen/include/asm-arm/iommu.h
@@ -20,9 +20,6 @@ struct arch_iommu
     void *priv;
 };
 
-/* Always share P2M Table between the CPU and the IOMMU */
-#define iommu_use_hap_pt(d) is_iommu_enabled(d)
-
 const struct iommu_ops *iommu_get_ops(void);
 void iommu_set_ops(const struct iommu_ops *ops);
 
diff --git a/xen/include/asm-x86/iommu.h b/xen/include/asm-x86/iommu.h
index 6d024d5c0e..25d2aee9a9 100644
--- a/xen/include/asm-x86/iommu.h
+++ b/xen/include/asm-x86/iommu.h
@@ -79,10 +79,6 @@ struct iommu_init_ops {
 
 extern const struct iommu_init_ops *iommu_init_ops;
 
-/* Are we using the domain P2M table as its IOMMU pagetable? */
-#define iommu_use_hap_pt(d) \
-    (hap_enabled(d) && is_iommu_enabled(d) && iommu_hap_pt_share)
-
 void iommu_update_ire_from_apic(unsigned int apic, unsigned int reg, unsigned int value);
 unsigned int iommu_read_apic_from_ire(unsigned int apic, unsigned int reg);
 int iommu_setup_hpet_msi(struct msi_desc *);
diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index 4b6871936c..5e7ca98170 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -268,6 +268,17 @@ struct domain_iommu {
 #define iommu_set_feature(d, f)   set_bit(f, dom_iommu(d)->features)
 #define iommu_clear_feature(d, f) clear_bit(f, dom_iommu(d)->features)
 
+/* Are we using the domain P2M table as its IOMMU pagetable? */
+#define iommu_use_hap_pt(d) \
+    (hap_enabled(d) && is_iommu_enabled(d) && iommu_hap_pt_share)
+
+/* Does the IOMMU pagetable need to be kept synchronized with the P2M */
+#ifdef CONFIG_HAS_PASSTHROUGH
+#define need_iommu_pt_sync(d)     (dom_iommu(d)->need_sync)
+#else
+#define need_iommu_pt_sync(d)     false
+#endif
+
 int __must_check iommu_suspend(void);
 void iommu_resume(void);
 void iommu_crash_shutdown(void);
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 61bc75ba71..470fa384a0 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -963,12 +963,6 @@ static inline bool is_hwdom_pinned_vcpu(const struct vcpu *v)
             cpumask_weight(v->cpu_hard_affinity) == 1);
 }
 
-#ifdef CONFIG_HAS_PASSTHROUGH
-#define need_iommu_pt_sync(d) (dom_iommu(d)->need_sync)
-#else
-#define need_iommu_pt_sync(d) false
-#endif
-
 static inline bool is_vcpu_online(const struct vcpu *v)
 {
     return !test_bit(_VPF_down, &v->pause_flags);
-- 
2.20.1.2.gb21ebb671


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