[PATCH 3/6] iommu: remove iommu_lookup_page() and the lookup_page() method...

[Paul Durrant <paul@xen.org>]

From: Paul Durrant <pdurrant@amazon.com>

... from iommu_ops.

This patch is essentially a reversion of dd93d54f "vtd: add lookup_page method
to iommu_ops". The code was intended to be used by a patch that has long-
since been abandoned. Therefore it is dead code and can be removed.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
---
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Kevin Tian <kevin.tian@intel.com>
---
 xen/drivers/passthrough/iommu.c     | 11 --------
 xen/drivers/passthrough/vtd/iommu.c | 41 -----------------------------
 xen/include/xen/iommu.h             |  5 ----
 3 files changed, 57 deletions(-)

diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index dad4088531..327df17c5d 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -350,17 +350,6 @@ int iommu_legacy_unmap(struct domain *d, dfn_t dfn, unsigned int page_order)
     return rc;
 }
 
-int iommu_lookup_page(struct domain *d, dfn_t dfn, mfn_t *mfn,
-                      unsigned int *flags)
-{
-    const struct domain_iommu *hd = dom_iommu(d);
-
-    if ( !is_iommu_enabled(d) || !hd->platform_ops->lookup_page )
-        return -EOPNOTSUPP;
-
-    return iommu_call(hd->platform_ops, lookup_page, d, dfn, mfn, flags);
-}
-
 int iommu_iotlb_flush(struct domain *d, dfn_t dfn, unsigned int page_count,
                       unsigned int flush_flags)
 {
diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/vtd/iommu.c
index 40834e2e7a..149d7122c3 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1808,46 +1808,6 @@ static int __must_check intel_iommu_unmap_page(struct domain *d, dfn_t dfn,
     return 0;
 }
 
-static int intel_iommu_lookup_page(struct domain *d, dfn_t dfn, mfn_t *mfn,
-                                   unsigned int *flags)
-{
-    struct domain_iommu *hd = dom_iommu(d);
-    struct dma_pte *page, val;
-    u64 pg_maddr;
-
-    /*
-     * If VT-d shares EPT page table or if the domain is the hardware
-     * domain and iommu_passthrough is set then pass back the dfn.
-     */
-    if ( iommu_use_hap_pt(d) ||
-         (iommu_hwdom_passthrough && is_hardware_domain(d)) )
-        return -EOPNOTSUPP;
-
-    spin_lock(&hd->arch.mapping_lock);
-
-    pg_maddr = addr_to_dma_page_maddr(d, dfn_to_daddr(dfn), 0);
-    if ( !pg_maddr )
-    {
-        spin_unlock(&hd->arch.mapping_lock);
-        return -ENOENT;
-    }
-
-    page = map_vtd_domain_page(pg_maddr);
-    val = page[dfn_x(dfn) & LEVEL_MASK];
-
-    unmap_vtd_domain_page(page);
-    spin_unlock(&hd->arch.mapping_lock);
-
-    if ( !dma_pte_present(val) )
-        return -ENOENT;
-
-    *mfn = maddr_to_mfn(dma_pte_addr(val));
-    *flags = dma_pte_read(val) ? IOMMUF_readable : 0;
-    *flags |= dma_pte_write(val) ? IOMMUF_writable : 0;
-
-    return 0;
-}
-
 static int __init vtd_ept_page_compatible(struct vtd_iommu *iommu)
 {
     u64 ept_cap, vtd_cap = iommu->cap;
@@ -2710,7 +2670,6 @@ static struct iommu_ops __initdata vtd_ops = {
     .teardown = iommu_domain_teardown,
     .map_page = intel_iommu_map_page,
     .unmap_page = intel_iommu_unmap_page,
-    .lookup_page = intel_iommu_lookup_page,
     .reassign_device = reassign_device_ownership,
     .get_device_group_id = intel_iommu_group_id,
     .enable_x2apic = intel_iommu_enable_eim,
diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index 51c29180a4..271bd8e546 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -158,9 +158,6 @@ int __must_check iommu_legacy_map(struct domain *d, dfn_t dfn, mfn_t mfn,
 int __must_check iommu_legacy_unmap(struct domain *d, dfn_t dfn,
                                     unsigned int page_order);
 
-int __must_check iommu_lookup_page(struct domain *d, dfn_t dfn, mfn_t *mfn,
-                                   unsigned int *flags);
-
 int __must_check iommu_iotlb_flush(struct domain *d, dfn_t dfn,
                                    unsigned int page_count,
                                    unsigned int flush_flags);
@@ -260,8 +257,6 @@ struct iommu_ops {
                                  unsigned int *flush_flags);
     int __must_check (*unmap_page)(struct domain *d, dfn_t dfn,
                                    unsigned int *flush_flags);
-    int __must_check (*lookup_page)(struct domain *d, dfn_t dfn, mfn_t *mfn,
-                                    unsigned int *flags);
 
 #ifdef CONFIG_X86
     int (*enable_x2apic)(void);
-- 
2.20.1