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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 3/4] iommu: elide flushing for higher order map/unmap operations
This patch removes any implicit flushing that occurs in the implementation
of map and unmap operations and adds new iommu_map/unmap() wrapper
functions. To maintain sematics of the iommu_legacy_map/unmap() wrapper
functions, these are modified to call the new wrapper functions and then
perform an explicit flush operation.
Because VT-d currently performs two different types of flush dependent upon
whether a PTE is being modified versus merely added (i.e. replacing a non-
present PTE) 'iommu flush flags' are defined by this patch and the
iommu_ops map_page() and unmap_page() methods are modified to OR the type
of flush necessary for the PTE that has been populated or depopulated into
an accumulated flags value. The accumulated value can then be passed into
the explicit flush operation.
The ARM SMMU implementations of map_page() and unmap_page() currently
perform no implicit flushing and therefore the modified methods do not
adjust the flush flags.
NOTE: The per-cpu 'iommu_dont_flush_iotlb' is respected by the
iommu_legacy_map() wrapper function and therefore this now applies to
all IOMMU implementations rather than just VT-d.
Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
---
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Cc: Brian Woods <brian.woods@xxxxxxx>
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Cc: "Roger Pau Monné" <roger.pau@xxxxxxxxxx>
v2:
- Add the new iommu_map/unmap() and don't proliferate use of
iommu_dont_flush_iotlb.
- Use 'flush flags' instead of a 'iommu_flush_type'
- Add a 'flush_flags' argument to iommu_flush() and modify the call-sites.
This code has only been compile tested for ARM.
---
xen/arch/arm/p2m.c | 11 ++++-
xen/common/memory.c | 6 ++-
xen/drivers/passthrough/amd/iommu_map.c | 68 +++++++++++++++++----------
xen/drivers/passthrough/arm/smmu.c | 15 ++++--
xen/drivers/passthrough/iommu.c | 57 +++++++++++++++++-----
xen/drivers/passthrough/vtd/iommu.c | 33 ++++++++-----
xen/drivers/passthrough/x86/iommu.c | 19 +++++---
xen/include/asm-x86/hvm/svm/amd-iommu-proto.h | 9 ++--
xen/include/xen/iommu.h | 28 +++++++++--
9 files changed, 173 insertions(+), 73 deletions(-)
diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index e8b7624492..74264711ce 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -971,8 +971,17 @@ static int __p2m_set_entry(struct p2m_domain *p2m,
if ( need_iommu_pt_sync(p2m->domain) &&
(lpae_is_valid(orig_pte) || lpae_is_valid(*entry)) )
+ {
+ unsigned int flush_flags = 0;
+
+ if ( lpae_is_valid(orig_pte) )
+ flush_flags |= IOMMU_FLUSHF_modified;
+ if ( lpae_is_valid(*entry) )
+ flush_flags |= IOMMU_FLUSHF_added;
+
rc = iommu_flush(p2m->domain, _dfn(gfn_x(sgfn)),
- 1UL << page_order);
+ 1UL << page_order, flush_flags);
+ }
else
rc = 0;
diff --git a/xen/common/memory.c b/xen/common/memory.c
index 7b668077d8..f6ba852136 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -865,11 +865,13 @@ int xenmem_add_to_physmap(struct domain *d, struct
xen_add_to_physmap *xatp,
this_cpu(iommu_dont_flush_iotlb) = 0;
- ret = iommu_flush(d, _dfn(xatp->idx - done), done);
+ ret = iommu_flush(d, _dfn(xatp->idx - done), done,
+ IOMMU_FLUSHF_added | IOMMU_FLUSHF_modified);
if ( unlikely(ret) && rc >= 0 )
rc = ret;
- ret = iommu_flush(d, _dfn(xatp->gpfn - done), done);
+ ret = iommu_flush(d, _dfn(xatp->gpfn - done), done,
+ IOMMU_FLUSHF_added | IOMMU_FLUSHF_modified);
if ( unlikely(ret) && rc >= 0 )
rc = ret;
}
diff --git a/xen/drivers/passthrough/amd/iommu_map.c
b/xen/drivers/passthrough/amd/iommu_map.c
index b6ddf211c6..de6ecb9f04 100644
--- a/xen/drivers/passthrough/amd/iommu_map.c
+++ b/xen/drivers/passthrough/amd/iommu_map.c
@@ -45,13 +45,15 @@ static void clear_iommu_pte_present(unsigned long l1_mfn,
unsigned long dfn)
unmap_domain_page(table);
}
-static bool set_iommu_pde_present(uint32_t *pde, unsigned long next_mfn,
- unsigned int next_level,
- bool iw, bool ir)
+static unsigned int set_iommu_pde_present(uint32_t *pde,
+ unsigned long next_mfn,
+ unsigned int next_level, bool iw,
+ bool ir)
{
uint64_t maddr_next;
uint32_t addr_lo, addr_hi, entry;
- bool need_flush = false, old_present;
+ bool old_present;
+ unsigned int flush_flags = 0;
maddr_next = __pfn_to_paddr(next_mfn);
@@ -84,7 +86,7 @@ static bool set_iommu_pde_present(uint32_t *pde, unsigned
long next_mfn,
if ( maddr_old != maddr_next || iw != old_w || ir != old_r ||
old_level != next_level )
- need_flush = true;
+ flush_flags = IOMMU_FLUSHF_modified;
}
addr_lo = maddr_next & DMA_32BIT_MASK;
@@ -121,24 +123,27 @@ static bool set_iommu_pde_present(uint32_t *pde, unsigned
long next_mfn,
IOMMU_PDE_PRESENT_SHIFT, &entry);
pde[0] = entry;
- return need_flush;
+ return flush_flags;
}
-static bool set_iommu_pte_present(unsigned long pt_mfn, unsigned long dfn,
- unsigned long next_mfn, int pde_level,
- bool iw, bool ir)
+static unsigned int set_iommu_pte_present(unsigned long pt_mfn,
+ unsigned long dfn,
+ unsigned long next_mfn,
+ int pde_level,
+ bool iw, bool ir)
{
uint64_t *table;
uint32_t *pde;
- bool need_flush;
+ unsigned int flush_flags;
table = map_domain_page(_mfn(pt_mfn));
pde = (uint32_t *)(table + pfn_to_pde_idx(dfn, pde_level));
- need_flush = set_iommu_pde_present(pde, next_mfn, 0, iw, ir);
+ flush_flags = set_iommu_pde_present(pde, next_mfn, 0, iw, ir);
unmap_domain_page(table);
- return need_flush;
+
+ return flush_flags;
}
void amd_iommu_set_root_page_table(uint32_t *dte, uint64_t root_ptr,
@@ -522,9 +527,8 @@ static int update_paging_mode(struct domain *d, unsigned
long dfn)
}
int amd_iommu_map_page(struct domain *d, dfn_t dfn, mfn_t mfn,
- unsigned int flags)
+ unsigned int flags, unsigned int *flush_flags)
{
- bool need_flush;
struct domain_iommu *hd = dom_iommu(d);
int rc;
unsigned long pt_mfn[7];
@@ -570,18 +574,17 @@ int amd_iommu_map_page(struct domain *d, dfn_t dfn, mfn_t
mfn,
}
/* Install 4k mapping */
- need_flush = set_iommu_pte_present(pt_mfn[1], dfn_x(dfn), mfn_x(mfn), 1,
- !!(flags & IOMMUF_writable),
- !!(flags & IOMMUF_readable));
-
- if ( need_flush )
- amd_iommu_flush_pages(d, dfn_x(dfn), 0);
+ *flush_flags |= set_iommu_pte_present(pt_mfn[1], dfn_x(dfn), mfn_x(mfn),
+ 1, !!(flags & IOMMUF_writable),
+ !!(flags & IOMMUF_readable));
spin_unlock(&hd->arch.mapping_lock);
+
return 0;
}
-int amd_iommu_unmap_page(struct domain *d, dfn_t dfn)
+int amd_iommu_unmap_page(struct domain *d, dfn_t dfn,
+ unsigned int *flush_flags)
{
unsigned long pt_mfn[7];
struct domain_iommu *hd = dom_iommu(d);
@@ -627,10 +630,10 @@ int amd_iommu_unmap_page(struct domain *d, dfn_t dfn)
/* mark PTE as 'page not present' */
clear_iommu_pte_present(pt_mfn[1], dfn_x(dfn));
+ *flush_flags |= IOMMU_FLUSHF_modified;
spin_unlock(&hd->arch.mapping_lock);
- amd_iommu_flush_pages(d, dfn_x(dfn), 0);
return 0;
}
@@ -645,11 +648,13 @@ static unsigned long flush_count(unsigned long dfn,
unsigned int page_count,
}
int amd_iommu_flush_iotlb_pages(struct domain *d, dfn_t dfn,
- unsigned int page_count)
+ unsigned int page_count,
+ unsigned int flush_flags)
{
unsigned long dfn_l = dfn_x(dfn);
ASSERT(page_count && !dfn_eq(dfn, INVALID_DFN));
+ ASSERT(flush_flags & IOMMU_FLUSHF_modified);
/* If the range wraps then just flush everything */
if ( dfn_l + page_count < dfn_l )
@@ -692,6 +697,7 @@ int amd_iommu_reserve_domain_unity_map(struct domain
*domain,
unsigned long npages, i;
unsigned long gfn;
unsigned int flags = !!ir;
+ unsigned int flush_flags = 0;
int rt = 0;
if ( iw )
@@ -703,11 +709,21 @@ int amd_iommu_reserve_domain_unity_map(struct domain
*domain,
{
unsigned long frame = gfn + i;
- rt = amd_iommu_map_page(domain, _dfn(frame), _mfn(frame), flags);
+ rt = amd_iommu_map_page(domain, _dfn(frame), _mfn(frame), flags,
+ &flush_flags);
if ( rt != 0 )
- return rt;
+ break;
}
- return 0;
+
+ /*
+ * The underlying implementation is void so the return value is
+ * meaningless and can hence be ignored.
+ */
+ while ( amd_iommu_flush_iotlb_pages(domain, _dfn(gfn), npages,
+ flush_flags) )
+ break;
+
+ return rt;
}
/* Share p2m table with iommu. */
diff --git a/xen/drivers/passthrough/arm/smmu.c
b/xen/drivers/passthrough/arm/smmu.c
index 9612c0fddc..5d12639e97 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -2534,9 +2534,12 @@ static int __must_check arm_smmu_iotlb_flush_all(struct
domain *d)
return 0;
}
-static int __must_check arm_smmu_iotlb_flush(struct domain *d, dfn_t dfn,
- unsigned int page_count)
+static int __must_check arm_smmu_iotlb_flush(
+ struct domain *d, dfn_t dfn, unsigned int page_count,
+ unsigned int flush_flags)
{
+ ASSERT(flush_flags);
+
/* ARM SMMU v1 doesn't have flush by VMA and VMID */
return arm_smmu_iotlb_flush_all(d);
}
@@ -2731,8 +2734,9 @@ static void arm_smmu_iommu_domain_teardown(struct domain
*d)
xfree(xen_domain);
}
-static int __must_check arm_smmu_map_page(struct domain *d, dfn_t dfn,
- mfn_t mfn, unsigned int flags)
+static int __must_check arm_smmu_map_page(
+ struct domain *d, dfn_t dfn, mfn_t mfn, unsigned int flags,
+ unsigned int *flush_flags)
{
p2m_type_t t;
@@ -2761,7 +2765,8 @@ static int __must_check arm_smmu_map_page(struct domain
*d, dfn_t dfn,
0, t);
}
-static int __must_check arm_smmu_unmap_page(struct domain *d, dfn_t dfn)
+static int __must_check arm_smmu_unmap_page(struct domain *d, dfn_t dfn,
+ unsigned int *flush_flags)
{
/*
* This function should only be used by gnttab code when the domain
diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index 6d231bec94..60862ddaa2 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -211,7 +211,7 @@ void __hwdom_init iommu_hwdom_init(struct domain *d)
if ( need_iommu_pt_sync(d) )
{
struct page_info *page;
- unsigned int i = 0;
+ unsigned int i = 0, flush_flags = 0;
int rc = 0;
page_list_for_each ( page, &d->page_list )
@@ -226,8 +226,9 @@ void __hwdom_init iommu_hwdom_init(struct domain *d)
== PGT_writable_page) )
mapping |= IOMMUF_writable;
- ret = iommu_legacy_map(d, _dfn(dfn), _mfn(mfn), mapping,
- PAGE_ORDER_4K);
+ ret = iommu_map(d, _dfn(dfn), _mfn(mfn), mapping, 0,
+ &flush_flags);
+
if ( !rc )
rc = ret;
@@ -235,6 +236,9 @@ void __hwdom_init iommu_hwdom_init(struct domain *d)
process_pending_softirqs();
}
+ while ( !flush_flags && iommu_flush_all(d) )
+ break;
+
if ( rc )
printk(XENLOG_WARNING "d%d: IOMMU mapping failed: %d\n",
d->domain_id, rc);
@@ -304,8 +308,9 @@ void iommu_domain_destroy(struct domain *d)
arch_iommu_domain_destroy(d);
}
-int iommu_legacy_map(struct domain *d, dfn_t dfn, mfn_t mfn,
- unsigned int page_order, unsigned int flags)
+int iommu_map(struct domain *d, dfn_t dfn, mfn_t mfn,
+ unsigned int page_order, unsigned int flags,
+ unsigned int *flush_flags)
{
const struct domain_iommu *hd = dom_iommu(d);
unsigned long i;
@@ -320,7 +325,8 @@ int iommu_legacy_map(struct domain *d, dfn_t dfn, mfn_t mfn,
for ( i = 0; i < (1ul << page_order); i++ )
{
rc = hd->platform_ops->map_page(d, dfn_add(dfn, i),
- mfn_add(mfn, i), flags);
+ mfn_add(mfn, i), flags,
+ flush_flags);
if ( likely(!rc) )
continue;
@@ -333,7 +339,8 @@ int iommu_legacy_map(struct domain *d, dfn_t dfn, mfn_t mfn,
while ( i-- )
/* if statement to satisfy __must_check */
- if ( hd->platform_ops->unmap_page(d, dfn_add(dfn, i)) )
+ if ( hd->platform_ops->unmap_page(d, dfn_add(dfn, i),
+ flush_flags) )
continue;
if ( !is_hardware_domain(d) )
@@ -345,7 +352,20 @@ int iommu_legacy_map(struct domain *d, dfn_t dfn, mfn_t
mfn,
return rc;
}
-int iommu_legacy_unmap(struct domain *d, dfn_t dfn, unsigned int page_order)
+int iommu_legacy_map(struct domain *d, dfn_t dfn, mfn_t mfn,
+ unsigned int page_order, unsigned int flags)
+{
+ unsigned int flush_flags = 0;
+ int rc = iommu_map(d, dfn, mfn, page_order, flags, &flush_flags);
+
+ if ( !rc && !this_cpu(iommu_dont_flush_iotlb) )
+ rc = iommu_flush(d, dfn, (1u << page_order), flush_flags);
+
+ return rc;
+}
+
+int iommu_unmap(struct domain *d, dfn_t dfn, unsigned int page_order,
+ unsigned int *flush_flags)
{
const struct domain_iommu *hd = dom_iommu(d);
unsigned long i;
@@ -358,7 +378,8 @@ int iommu_legacy_unmap(struct domain *d, dfn_t dfn,
unsigned int page_order)
for ( i = 0; i < (1ul << page_order); i++ )
{
- int err = hd->platform_ops->unmap_page(d, dfn_add(dfn, i));
+ int err = hd->platform_ops->unmap_page(d, dfn_add(dfn, i),
+ flush_flags);
if ( likely(!err) )
continue;
@@ -381,6 +402,17 @@ int iommu_legacy_unmap(struct domain *d, dfn_t dfn,
unsigned int page_order)
return rc;
}
+int iommu_legacy_unmap(struct domain *d, dfn_t dfn, unsigned int page_order)
+{
+ unsigned int flush_flags = 0;
+ int rc = iommu_unmap(d, dfn, page_order, &flush_flags);
+
+ if ( !rc )
+ rc = iommu_flush(d, dfn, (1u << page_order), flush_flags);
+
+ return rc;
+}
+
int iommu_lookup_page(struct domain *d, dfn_t dfn, mfn_t *mfn,
unsigned int *flags)
{
@@ -409,19 +441,20 @@ static void iommu_free_pagetables(unsigned long unused)
cpumask_cycle(smp_processor_id(),
&cpu_online_map));
}
-int iommu_flush(struct domain *d, dfn_t dfn, unsigned int page_count)
+int iommu_flush(struct domain *d, dfn_t dfn, unsigned int page_count,
+ unsigned int flush_flags)
{
const struct domain_iommu *hd = dom_iommu(d);
int rc;
if ( !iommu_enabled || !hd->platform_ops ||
- !hd->platform_ops->iotlb_flush || !page_count )
+ !hd->platform_ops->iotlb_flush || !page_count || !flush_flags )
return 0;
if ( dfn_eq(dfn, INVALID_DFN) )
return -EINVAL;
- rc = hd->platform_ops->iotlb_flush(d, dfn, page_count);
+ rc = hd->platform_ops->iotlb_flush(d, dfn, page_count, flush_flags);
if ( unlikely(rc) )
{
if ( !d->is_shutting_down && printk_ratelimit() )
diff --git a/xen/drivers/passthrough/vtd/iommu.c
b/xen/drivers/passthrough/vtd/iommu.c
index 8727e242e2..e0326f9456 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -633,11 +633,14 @@ static int __must_check iommu_flush_iotlb(struct domain
*d, dfn_t dfn,
static int __must_check iommu_flush_iotlb_pages(struct domain *d,
dfn_t dfn,
- unsigned int page_count)
+ unsigned int page_count,
+ unsigned int flush_flags)
{
ASSERT(page_count && !dfn_eq(dfn, INVALID_DFN));
+ ASSERT(flush_flags);
- return iommu_flush_iotlb(d, dfn, 1, page_count);
+ return iommu_flush_iotlb(d, dfn, flush_flags & IOMMU_FLUSHF_modified,
+ page_count);
}
static int __must_check iommu_flush_iotlb_all(struct domain *d)
@@ -676,9 +679,6 @@ static int __must_check dma_pte_clear_one(struct domain
*domain, u64 addr)
spin_unlock(&hd->arch.mapping_lock);
iommu_flush_cache_entry(pte, sizeof(struct dma_pte));
- if ( !this_cpu(iommu_dont_flush_iotlb) )
- rc = iommu_flush_iotlb_pages(domain, daddr_to_dfn(addr), 1);
-
unmap_vtd_domain_page(page);
return rc;
@@ -1773,9 +1773,9 @@ static void iommu_domain_teardown(struct domain *d)
spin_unlock(&hd->arch.mapping_lock);
}
-static int __must_check intel_iommu_map_page(struct domain *d,
- dfn_t dfn, mfn_t mfn,
- unsigned int flags)
+static int __must_check intel_iommu_map_page(struct domain *d, dfn_t dfn,
+ mfn_t mfn, unsigned int flags,
+ unsigned int *flush_flags)
{
struct domain_iommu *hd = dom_iommu(d);
struct dma_pte *page, *pte, old, new = {};
@@ -1825,15 +1825,18 @@ static int __must_check intel_iommu_map_page(struct
domain *d,
spin_unlock(&hd->arch.mapping_lock);
unmap_vtd_domain_page(page);
- if ( !this_cpu(iommu_dont_flush_iotlb) )
- rc = iommu_flush_iotlb(d, dfn, dma_pte_present(old), 1);
+ *flush_flags |= IOMMU_FLUSHF_added;
+ if ( dma_pte_present(old) )
+ *flush_flags |= IOMMU_FLUSHF_modified;
return rc;
}
-static int __must_check intel_iommu_unmap_page(struct domain *d,
- dfn_t dfn)
+static int __must_check intel_iommu_unmap_page(struct domain *d, dfn_t dfn,
+ unsigned int *flush_flags)
{
+ int rc;
+
/* Do nothing if VT-d shares EPT page table */
if ( iommu_use_hap_pt(d) )
return 0;
@@ -1842,7 +1845,11 @@ static int __must_check intel_iommu_unmap_page(struct
domain *d,
if ( iommu_hwdom_passthrough && is_hardware_domain(d) )
return 0;
- return dma_pte_clear_one(d, dfn_to_daddr(dfn));
+ rc = dma_pte_clear_one(d, dfn_to_daddr(dfn));
+ if ( !rc )
+ *flush_flags |= IOMMU_FLUSHF_modified;
+
+ return rc;
}
static int intel_iommu_lookup_page(struct domain *d, dfn_t dfn, mfn_t *mfn,
diff --git a/xen/drivers/passthrough/x86/iommu.c
b/xen/drivers/passthrough/x86/iommu.c
index c1f3e2442e..61841e6c79 100644
--- a/xen/drivers/passthrough/x86/iommu.c
+++ b/xen/drivers/passthrough/x86/iommu.c
@@ -49,7 +49,6 @@ int arch_iommu_populate_page_table(struct domain *d)
struct page_info *page;
int rc = 0, n = 0;
- this_cpu(iommu_dont_flush_iotlb) = 1;
spin_lock(&d->page_alloc_lock);
if ( unlikely(d->is_dying) )
@@ -62,14 +61,15 @@ int arch_iommu_populate_page_table(struct domain *d)
{
unsigned long mfn = mfn_x(page_to_mfn(page));
unsigned long gfn = mfn_to_gmfn(d, mfn);
+ unsigned int flush_flags = 0;
if ( gfn != gfn_x(INVALID_GFN) )
{
ASSERT(!(gfn >> DEFAULT_DOMAIN_ADDRESS_WIDTH));
BUG_ON(SHARED_M2P(gfn));
- rc = iommu_legacy_map(d, _dfn(gfn), _mfn(mfn),
- PAGE_ORDER_4K, IOMMUF_readable |
- IOMMUF_writable);
+ rc = iommu_map(d, _dfn(gfn), _mfn(mfn),
+ PAGE_ORDER_4K, IOMMUF_readable |
+ IOMMUF_writable, &flush_flags);
}
if ( rc )
{
@@ -103,7 +103,6 @@ int arch_iommu_populate_page_table(struct domain *d)
}
spin_unlock(&d->page_alloc_lock);
- this_cpu(iommu_dont_flush_iotlb) = 0;
if ( !rc )
rc = iommu_flush_all(d);
@@ -206,6 +205,7 @@ static bool __hwdom_init hwdom_iommu_map(const struct
domain *d,
void __hwdom_init arch_iommu_hwdom_init(struct domain *d)
{
unsigned long i, top, max_pfn;
+ unsigned int flush_flags = 0;
BUG_ON(!is_hardware_domain(d));
@@ -240,8 +240,10 @@ void __hwdom_init arch_iommu_hwdom_init(struct domain *d)
if ( paging_mode_translate(d) )
rc = set_identity_p2m_entry(d, pfn, p2m_access_rw, 0);
else
- rc = iommu_legacy_map(d, _dfn(pfn), _mfn(pfn), PAGE_ORDER_4K,
- IOMMUF_readable | IOMMUF_writable);
+ rc = iommu_map(d, _dfn(pfn), _mfn(pfn), PAGE_ORDER_4K,
+ IOMMUF_readable | IOMMUF_writable,
+ &flush_flags);
+
if ( rc )
printk(XENLOG_WARNING " d%d: IOMMU mapping failed: %d\n",
d->domain_id, rc);
@@ -249,6 +251,9 @@ void __hwdom_init arch_iommu_hwdom_init(struct domain *d)
if (!(i & 0xfffff))
process_pending_softirqs();
}
+
+ if ( !flush_flags && iommu_flush_all(d) )
+ return;
}
/*
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 88715329ca..c5697565d6 100644
--- a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
+++ b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
@@ -53,15 +53,18 @@ int amd_iommu_update_ivrs_mapping_acpi(void);
/* mapping functions */
int __must_check amd_iommu_map_page(struct domain *d, dfn_t dfn,
- mfn_t mfn, unsigned int flags);
-int __must_check amd_iommu_unmap_page(struct domain *d, dfn_t dfn);
+ mfn_t mfn, unsigned int flags,
+ unsigned int *flush_flags);
+int __must_check amd_iommu_unmap_page(struct domain *d, dfn_t dfn,
+ unsigned int *flush_flags);
uint64_t amd_iommu_get_address_from_pte(void *entry);
int __must_check amd_iommu_alloc_root(struct domain_iommu *hd);
int amd_iommu_reserve_domain_unity_map(struct domain *domain,
paddr_t phys_addr, unsigned long size,
int iw, int ir);
int __must_check amd_iommu_flush_iotlb_pages(struct domain *d, dfn_t dfn,
- unsigned int page_count);
+ unsigned int page_count,
+ unsigned int flush_flags);
int __must_check amd_iommu_flush_iotlb_all(struct domain *d);
/* Share p2m table with iommu */
diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index 6773d605a9..93b41cd648 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -93,6 +93,22 @@ void iommu_teardown(struct domain *d);
#define _IOMMUF_writable 1
#define IOMMUF_writable (1u<<_IOMMUF_writable)
+enum
+{
+ _IOMMU_FLUSHF_added, /* no modified entries, just additional entries */
+ _IOMMU_FLUSHF_modified, /* modified entries */
+};
+
+#define IOMMU_FLUSHF_added (1u << _IOMMU_FLUSHF_added)
+#define IOMMU_FLUSHF_modified (1u << _IOMMU_FLUSHF_modified)
+
+int __must_check iommu_map(struct domain *d, dfn_t dfn, mfn_t mfn,
+ unsigned int page_order, unsigned int flags,
+ unsigned int *flush_flags);
+int __must_check iommu_unmap(struct domain *d, dfn_t dfn,
+ unsigned int page_order,
+ unsigned int *flush_flags);
+
int __must_check iommu_legacy_map(struct domain *d, dfn_t dfn, mfn_t mfn,
unsigned int page_order,
unsigned int flags);
@@ -102,7 +118,8 @@ int __must_check iommu_legacy_unmap(struct domain *d, dfn_t
dfn,
int __must_check iommu_lookup_page(struct domain *d, dfn_t dfn, mfn_t *mfn,
unsigned int *flags);
int __must_check iommu_flush(struct domain *d, dfn_t dfn,
- unsigned int page_count);
+ unsigned int page_count,
+ unsigned int flush_flags);
int __must_check iommu_flush_all(struct domain *d);
enum iommu_feature
@@ -182,8 +199,10 @@ struct iommu_ops {
* other by the caller in order to have meaningful results.
*/
int __must_check (*map_page)(struct domain *d, dfn_t dfn, mfn_t mfn,
- unsigned int flags);
- int __must_check (*unmap_page)(struct domain *d, dfn_t dfn);
+ unsigned int flags,
+ 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);
@@ -198,7 +217,8 @@ struct iommu_ops {
void (*share_p2m)(struct domain *d);
void (*crash_shutdown)(void);
int __must_check (*iotlb_flush)(struct domain *d, dfn_t dfn,
- unsigned int page_count);
+ unsigned int page_count,
+ unsigned int flush_flags);
int __must_check (*iotlb_flush_all)(struct domain *d);
int (*get_reserved_device_memory)(iommu_grdm_t *, void *);
void (*dump_p2m_table)(struct domain *d);
--
2.11.0
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