[Xen-devel] [PATCH v3 2/2] passthrough/amd: Clean iommu_hap_pt_share enabled code

[Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>]

At this moment IOMMU pt sharing is disabled by commit [1].

This patch cleans the unreachable code garded by iommu_hap_pt_share.

[1] c2ba3db31ef2d9f1e40e7b6c16cf3be3d671d555

Signed-off-by: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>
---
 xen/drivers/passthrough/amd/iommu_map.c       | 28 -------------------
 xen/drivers/passthrough/amd/pci_amd_iommu.c   |  4 ---
 xen/include/asm-x86/hvm/svm/amd-iommu-proto.h |  3 --
 3 files changed, 35 deletions(-)

diff --git a/xen/drivers/passthrough/amd/iommu_map.c 
b/xen/drivers/passthrough/amd/iommu_map.c
index cbf00e9e72..90cc7075c2 100644
--- a/xen/drivers/passthrough/amd/iommu_map.c
+++ b/xen/drivers/passthrough/amd/iommu_map.c
@@ -364,9 +364,6 @@ int amd_iommu_map_page(struct domain *d, dfn_t dfn, mfn_t 
mfn,
     int rc;
     unsigned long pt_mfn[7];
 
-    if ( iommu_use_hap_pt(d) )
-        return 0;
-
     memset(pt_mfn, 0, sizeof(pt_mfn));
 
     spin_lock(&hd->arch.mapping_lock);
@@ -420,9 +417,6 @@ int amd_iommu_unmap_page(struct domain *d, dfn_t dfn,
     unsigned long pt_mfn[7];
     struct domain_iommu *hd = dom_iommu(d);
 
-    if ( iommu_use_hap_pt(d) )
-        return 0;
-
     memset(pt_mfn, 0, sizeof(pt_mfn));
 
     spin_lock(&hd->arch.mapping_lock);
@@ -558,28 +552,6 @@ int amd_iommu_reserve_domain_unity_map(struct domain 
*domain,
     return rt;
 }
 
-/* Share p2m table with iommu. */
-void amd_iommu_share_p2m(struct domain *d)
-{
-    struct domain_iommu *hd = dom_iommu(d);
-    struct page_info *p2m_table;
-    mfn_t pgd_mfn;
-
-    pgd_mfn = pagetable_get_mfn(p2m_get_pagetable(p2m_get_hostp2m(d)));
-    p2m_table = mfn_to_page(pgd_mfn);
-
-    if ( hd->arch.root_table != p2m_table )
-    {
-        free_amd_iommu_pgtable(hd->arch.root_table);
-        hd->arch.root_table = p2m_table;
-
-        /* When sharing p2m with iommu, paging mode = 4 */
-        hd->arch.paging_mode = 4;
-        AMD_IOMMU_DEBUG("Share p2m table with iommu: p2m table = %#lx\n",
-                        mfn_x(pgd_mfn));
-    }
-}
-
 /*
  * Local variables:
  * mode: C
diff --git a/xen/drivers/passthrough/amd/pci_amd_iommu.c 
b/xen/drivers/passthrough/amd/pci_amd_iommu.c
index 4afbcd1609..be076210b6 100644
--- a/xen/drivers/passthrough/amd/pci_amd_iommu.c
+++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c
@@ -396,9 +396,6 @@ static void deallocate_iommu_page_tables(struct domain *d)
 {
     struct domain_iommu *hd = dom_iommu(d);
 
-    if ( iommu_use_hap_pt(d) )
-        return;
-
     spin_lock(&hd->arch.mapping_lock);
     if ( hd->arch.root_table )
     {
@@ -566,7 +563,6 @@ static const struct iommu_ops __initconstrel _iommu_ops = {
     .setup_hpet_msi = amd_setup_hpet_msi,
     .suspend = amd_iommu_suspend,
     .resume = amd_iommu_resume,
-    .share_p2m = amd_iommu_share_p2m,
     .crash_shutdown = amd_iommu_crash_shutdown,
     .dump_p2m_table = amd_dump_p2m_table,
 };
diff --git a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h 
b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
index e0d5d23978..b832f564a7 100644
--- a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
+++ b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
@@ -66,9 +66,6 @@ int __must_check amd_iommu_flush_iotlb_pages(struct domain 
*d, dfn_t dfn,
                                              unsigned int flush_flags);
 int __must_check amd_iommu_flush_iotlb_all(struct domain *d);
 
-/* Share p2m table with iommu */
-void amd_iommu_share_p2m(struct domain *d);
-
 /* device table functions */
 int get_dma_requestor_id(uint16_t seg, uint16_t bdf);
 void amd_iommu_set_intremap_table(struct amd_iommu_dte *dte,
-- 
2.17.1


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel