Mailing List Archive

From: Paul Durrant <pdurrant@amazon.com>

At the moment iommu_map() and iommu_unmap() take a page order rather than a
count, whereas iommu_iotlb_flush() takes a page count rather than an order.
This patch makes them consistent with each other, opting for a page count since
CPU page orders are not necessarily the same as those of an IOMMU.

NOTE: The 'page_count' parameter is also made an unsigned long in all the
aforementioned functions.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
---
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Wei Liu <wl@xen.org>
Cc: "Roger Pau Monné" <roger.pau@citrix.com>
Cc: George Dunlap <george.dunlap@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Julien Grall <julien@xen.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Jun Nakajima <jun.nakajima@intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Bertrand Marquis <Bertrand.Marquis@arm.com>
Cc: Oleksandr Tyshchenko <olekstysh@gmail.com>

v8:
- Fix IPMMU-VMSA code too

v7:
- Fix ARM build

v6:
- Fix missing conversion to unsigned long in AMD code
- Fixed unconverted call to iommu_legacy_unmap() in x86/mm.c
- s/1ul/1 in the grant table code

v5:
- Re-worked to just use a page count, rather than both a count and an order

v2:
- New in v2
---
xen/arch/x86/mm.c | 8 ++++--
xen/arch/x86/mm/p2m-ept.c | 6 ++--
xen/arch/x86/mm/p2m-pt.c | 4 +--
xen/arch/x86/mm/p2m.c | 5 ++--
xen/arch/x86/x86_64/mm.c | 4 +--
xen/common/grant_table.c | 6 ++--
xen/drivers/passthrough/amd/iommu.h | 2 +-
xen/drivers/passthrough/amd/iommu_map.c | 4 +--
xen/drivers/passthrough/arm/ipmmu-vmsa.c | 2 +-
xen/drivers/passthrough/arm/smmu.c | 2 +-
xen/drivers/passthrough/iommu.c | 35 +++++++++++-------------
xen/drivers/passthrough/vtd/iommu.c | 4 +--
xen/drivers/passthrough/x86/iommu.c | 2 +-
xen/include/xen/iommu.h | 12 ++++----
14 files changed, 48 insertions(+), 48 deletions(-)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 56bf7add2b..095422024a 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -2422,7 +2422,7 @@ static int cleanup_page_mappings(struct page_info *page)

if ( d && unlikely(need_iommu_pt_sync(d)) && is_pv_domain(d) )
{
- int rc2 = iommu_legacy_unmap(d, _dfn(mfn), PAGE_ORDER_4K);
+ int rc2 = iommu_legacy_unmap(d, _dfn(mfn), 1u << PAGE_ORDER_4K);

if ( !rc )
rc = rc2;
@@ -2949,9 +2949,11 @@ static int _get_page_type(struct page_info *page, unsigned long type,
mfn_t mfn = page_to_mfn(page);

if ( (x & PGT_type_mask) == PGT_writable_page )
- rc = iommu_legacy_unmap(d, _dfn(mfn_x(mfn)), PAGE_ORDER_4K);
+ rc = iommu_legacy_unmap(d, _dfn(mfn_x(mfn)),
+ 1ul << PAGE_ORDER_4K);
else
- rc = iommu_legacy_map(d, _dfn(mfn_x(mfn)), mfn, PAGE_ORDER_4K,
+ rc = iommu_legacy_map(d, _dfn(mfn_x(mfn)), mfn,
+ 1ul << PAGE_ORDER_4K,
IOMMUF_readable | IOMMUF_writable);

if ( unlikely(rc) )
diff --git a/xen/arch/x86/mm/p2m-ept.c b/xen/arch/x86/mm/p2m-ept.c
index b8154a7ecc..12cf38f6eb 100644
--- a/xen/arch/x86/mm/p2m-ept.c
+++ b/xen/arch/x86/mm/p2m-ept.c
@@ -843,14 +843,14 @@ out:
need_modify_vtd_table )
{
if ( iommu_use_hap_pt(d) )
- rc = iommu_iotlb_flush(d, _dfn(gfn), (1u << order),
+ rc = iommu_iotlb_flush(d, _dfn(gfn), 1ul << order,
(iommu_flags ? IOMMU_FLUSHF_added : 0) |
(vtd_pte_present ? IOMMU_FLUSHF_modified
: 0));
else if ( need_iommu_pt_sync(d) )
rc = iommu_flags ?
- iommu_legacy_map(d, _dfn(gfn), mfn, order, iommu_flags) :
- iommu_legacy_unmap(d, _dfn(gfn), order);
+ iommu_legacy_map(d, _dfn(gfn), mfn, 1ul << order, iommu_flags) :
+ iommu_legacy_unmap(d, _dfn(gfn), 1ul << order);
}

unmap_domain_page(table);
diff --git a/xen/arch/x86/mm/p2m-pt.c b/xen/arch/x86/mm/p2m-pt.c
index badb26bc34..3af51be78e 100644
--- a/xen/arch/x86/mm/p2m-pt.c
+++ b/xen/arch/x86/mm/p2m-pt.c
@@ -679,9 +679,9 @@ p2m_pt_set_entry(struct p2m_domain *p2m, gfn_t gfn_, mfn_t mfn,
if ( need_iommu_pt_sync(p2m->domain) &&
(iommu_old_flags != iommu_pte_flags || old_mfn != mfn_x(mfn)) )
rc = iommu_pte_flags
- ? iommu_legacy_map(d, _dfn(gfn), mfn, page_order,
+ ? iommu_legacy_map(d, _dfn(gfn), mfn, 1ul << page_order,
iommu_pte_flags)
- : iommu_legacy_unmap(d, _dfn(gfn), page_order);
+ : iommu_legacy_unmap(d, _dfn(gfn), 1ul << page_order);

/*
* Free old intermediate tables if necessary. This has to be the
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index db7bde0230..928344be30 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1352,7 +1352,8 @@ int set_identity_p2m_entry(struct domain *d, unsigned long gfn_l,
{
if ( !is_iommu_enabled(d) )
return 0;
- return iommu_legacy_map(d, _dfn(gfn_l), _mfn(gfn_l), PAGE_ORDER_4K,
+ return iommu_legacy_map(d, _dfn(gfn_l), _mfn(gfn_l),
+ 1ul << PAGE_ORDER_4K,
IOMMUF_readable | IOMMUF_writable);
}

@@ -1443,7 +1444,7 @@ int clear_identity_p2m_entry(struct domain *d, unsigned long gfn_l)
{
if ( !is_iommu_enabled(d) )
return 0;
- return iommu_legacy_unmap(d, _dfn(gfn_l), PAGE_ORDER_4K);
+ return iommu_legacy_unmap(d, _dfn(gfn_l), 1ul << PAGE_ORDER_4K);
}

gfn_lock(p2m, gfn, 0);
diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index 1f32062c15..98924447e1 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -1286,7 +1286,7 @@ int memory_add(unsigned long spfn, unsigned long epfn, unsigned int pxm)
{
for ( i = spfn; i < epfn; i++ )
if ( iommu_legacy_map(hardware_domain, _dfn(i), _mfn(i),
- PAGE_ORDER_4K,
+ 1ul << PAGE_ORDER_4K,
IOMMUF_readable | IOMMUF_writable) )
break;
if ( i != epfn )
@@ -1294,7 +1294,7 @@ int memory_add(unsigned long spfn, unsigned long epfn, unsigned int pxm)
while (i-- > old_max)
/* If statement to satisfy __must_check. */
if ( iommu_legacy_unmap(hardware_domain, _dfn(i),
- PAGE_ORDER_4K) )
+ 1ul << PAGE_ORDER_4K) )
continue;

goto destroy_m2p;
diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
index 9f0cae52c0..a5d3ed8bda 100644
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -1225,7 +1225,7 @@ map_grant_ref(
kind = IOMMUF_readable;
else
kind = 0;
- if ( kind && iommu_legacy_map(ld, _dfn(mfn_x(mfn)), mfn, 0, kind) )
+ if ( kind && iommu_legacy_map(ld, _dfn(mfn_x(mfn)), mfn, 1, kind) )
{
double_gt_unlock(lgt, rgt);
rc = GNTST_general_error;
@@ -1479,9 +1479,9 @@ unmap_common(

kind = mapkind(lgt, rd, op->mfn);
if ( !kind )
- err = iommu_legacy_unmap(ld, _dfn(mfn_x(op->mfn)), 0);
+ err = iommu_legacy_unmap(ld, _dfn(mfn_x(op->mfn)), 1);
else if ( !(kind & MAPKIND_WRITE) )
- err = iommu_legacy_map(ld, _dfn(mfn_x(op->mfn)), op->mfn, 0,
+ err = iommu_legacy_map(ld, _dfn(mfn_x(op->mfn)), op->mfn, 1,
IOMMUF_readable);

double_gt_unlock(lgt, rgt);
diff --git a/xen/drivers/passthrough/amd/iommu.h b/xen/drivers/passthrough/amd/iommu.h
index e2d174f3b4..f1f0415469 100644
--- a/xen/drivers/passthrough/amd/iommu.h
+++ b/xen/drivers/passthrough/amd/iommu.h
@@ -231,7 +231,7 @@ 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 long page_count,
unsigned int flush_flags);
int __must_check amd_iommu_flush_iotlb_all(struct domain *d);

diff --git a/xen/drivers/passthrough/amd/iommu_map.c b/xen/drivers/passthrough/amd/iommu_map.c
index 54b991294a..0cb948d114 100644
--- a/xen/drivers/passthrough/amd/iommu_map.c
+++ b/xen/drivers/passthrough/amd/iommu_map.c
@@ -351,7 +351,7 @@ int amd_iommu_unmap_page(struct domain *d, dfn_t dfn,
return 0;
}

-static unsigned long flush_count(unsigned long dfn, unsigned int page_count,
+static unsigned long flush_count(unsigned long dfn, unsigned long page_count,
unsigned int order)
{
unsigned long start = dfn >> order;
@@ -362,7 +362,7 @@ 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 long page_count,
unsigned int flush_flags)
{
unsigned long dfn_l = dfn_x(dfn);
diff --git a/xen/drivers/passthrough/arm/ipmmu-vmsa.c b/xen/drivers/passthrough/arm/ipmmu-vmsa.c
index b2a65dfaaf..346165c3fa 100644
--- a/xen/drivers/passthrough/arm/ipmmu-vmsa.c
+++ b/xen/drivers/passthrough/arm/ipmmu-vmsa.c
@@ -945,7 +945,7 @@ static int __must_check ipmmu_iotlb_flush_all(struct domain *d)
}

static int __must_check ipmmu_iotlb_flush(struct domain *d, dfn_t dfn,
- unsigned int page_count,
+ unsigned long page_count,
unsigned int flush_flags)
{
ASSERT(flush_flags);
diff --git a/xen/drivers/passthrough/arm/smmu.c b/xen/drivers/passthrough/arm/smmu.c
index 94662a8501..06f9bda47d 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -2534,7 +2534,7 @@ static int __must_check arm_smmu_iotlb_flush_all(struct domain *d)
}

static int __must_check arm_smmu_iotlb_flush(struct domain *d, dfn_t dfn,
- unsigned int page_count,
+ unsigned long page_count,
unsigned int flush_flags)
{
ASSERT(flush_flags);
diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index eb65631d59..87f9a857bb 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -235,7 +235,7 @@ void iommu_domain_destroy(struct domain *d)
}

int iommu_map(struct domain *d, dfn_t dfn, mfn_t mfn,
- unsigned int page_order, unsigned int flags,
+ unsigned long page_count, unsigned int flags,
unsigned int *flush_flags)
{
const struct domain_iommu *hd = dom_iommu(d);
@@ -245,10 +245,7 @@ int iommu_map(struct domain *d, dfn_t dfn, mfn_t mfn,
if ( !is_iommu_enabled(d) )
return 0;

- ASSERT(IS_ALIGNED(dfn_x(dfn), (1ul << page_order)));
- ASSERT(IS_ALIGNED(mfn_x(mfn), (1ul << page_order)));
-
- for ( i = 0; i < (1ul << page_order); i++ )
+ for ( i = 0; i < page_count; i++ )
{
rc = iommu_call(hd->platform_ops, map_page, d, dfn_add(dfn, i),
mfn_add(mfn, i), flags, flush_flags);
@@ -278,25 +275,26 @@ int iommu_map(struct domain *d, dfn_t dfn, mfn_t mfn,
* Something went wrong so, if we were dealing with more than a single
* page, flush everything and clear flush flags.
*/
- if ( page_order && unlikely(rc) && !iommu_iotlb_flush_all(d, *flush_flags) )
+ if ( page_count > 1 && unlikely(rc) &&
+ !iommu_iotlb_flush_all(d, *flush_flags) )
*flush_flags = 0;

return rc;
}

int iommu_legacy_map(struct domain *d, dfn_t dfn, mfn_t mfn,
- unsigned int page_order, unsigned int flags)
+ unsigned long page_count, unsigned int flags)
{
unsigned int flush_flags = 0;
- int rc = iommu_map(d, dfn, mfn, page_order, flags, &flush_flags);
+ int rc = iommu_map(d, dfn, mfn, page_count, flags, &flush_flags);

if ( !this_cpu(iommu_dont_flush_iotlb) && !rc )
- rc = iommu_iotlb_flush(d, dfn, (1u << page_order), flush_flags);
+ rc = iommu_iotlb_flush(d, dfn, page_count, flush_flags);

return rc;
}

-int iommu_unmap(struct domain *d, dfn_t dfn, unsigned int page_order,
+int iommu_unmap(struct domain *d, dfn_t dfn, unsigned long page_count,
unsigned int *flush_flags)
{
const struct domain_iommu *hd = dom_iommu(d);
@@ -306,9 +304,7 @@ int iommu_unmap(struct domain *d, dfn_t dfn, unsigned int page_order,
if ( !is_iommu_enabled(d) )
return 0;

- ASSERT(IS_ALIGNED(dfn_x(dfn), (1ul << page_order)));
-
- for ( i = 0; i < (1ul << page_order); i++ )
+ for ( i = 0; i < page_count; i++ )
{
int err = iommu_call(hd->platform_ops, unmap_page, d, dfn_add(dfn, i),
flush_flags);
@@ -335,19 +331,20 @@ int iommu_unmap(struct domain *d, dfn_t dfn, unsigned int page_order,
* Something went wrong so, if we were dealing with more than a single
* page, flush everything and clear flush flags.
*/
- if ( page_order && unlikely(rc) && !iommu_iotlb_flush_all(d, *flush_flags) )
+ if ( page_count > 1 && unlikely(rc) &&
+ !iommu_iotlb_flush_all(d, *flush_flags) )
*flush_flags = 0;

return rc;
}

-int iommu_legacy_unmap(struct domain *d, dfn_t dfn, unsigned int page_order)
+int iommu_legacy_unmap(struct domain *d, dfn_t dfn, unsigned long page_count)
{
unsigned int flush_flags = 0;
- int rc = iommu_unmap(d, dfn, page_order, &flush_flags);
+ int rc = iommu_unmap(d, dfn, page_count, &flush_flags);

if ( !this_cpu(iommu_dont_flush_iotlb) && !rc )
- rc = iommu_iotlb_flush(d, dfn, (1u << page_order), flush_flags);
+ rc = iommu_iotlb_flush(d, dfn, page_count, flush_flags);

return rc;
}
@@ -363,7 +360,7 @@ int iommu_lookup_page(struct domain *d, dfn_t dfn, mfn_t *mfn,
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,
+int iommu_iotlb_flush(struct domain *d, dfn_t dfn, unsigned long page_count,
unsigned int flush_flags)
{
const struct domain_iommu *hd = dom_iommu(d);
@@ -382,7 +379,7 @@ int iommu_iotlb_flush(struct domain *d, dfn_t dfn, unsigned int page_count,
{
if ( !d->is_shutting_down && printk_ratelimit() )
printk(XENLOG_ERR
- "d%d: IOMMU IOTLB flush failed: %d, dfn %"PRI_dfn", page count %u flags %x\n",
+ "d%d: IOMMU IOTLB flush failed: %d, dfn %"PRI_dfn", page count %lu flags %x\n",
d->domain_id, rc, dfn_x(dfn), page_count, flush_flags);

if ( !is_hardware_domain(d) )
diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/vtd/iommu.c
index 607e8b5e65..68cf0e535a 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -584,7 +584,7 @@ static int __must_check iommu_flush_all(void)

static int __must_check iommu_flush_iotlb(struct domain *d, dfn_t dfn,
bool_t dma_old_pte_present,
- unsigned int page_count)
+ unsigned long page_count)
{
struct domain_iommu *hd = dom_iommu(d);
struct acpi_drhd_unit *drhd;
@@ -632,7 +632,7 @@ 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 long page_count,
unsigned int flush_flags)
{
ASSERT(page_count && !dfn_eq(dfn, INVALID_DFN));
diff --git a/xen/drivers/passthrough/x86/iommu.c b/xen/drivers/passthrough/x86/iommu.c
index aea07e47c4..f17b1820f4 100644
--- a/xen/drivers/passthrough/x86/iommu.c
+++ b/xen/drivers/passthrough/x86/iommu.c
@@ -244,7 +244,7 @@ void __hwdom_init arch_iommu_hwdom_init(struct domain *d)
else if ( paging_mode_translate(d) )
rc = set_identity_p2m_entry(d, pfn, p2m_access_rw, 0);
else
- rc = iommu_map(d, _dfn(pfn), _mfn(pfn), PAGE_ORDER_4K,
+ rc = iommu_map(d, _dfn(pfn), _mfn(pfn), 1ul << PAGE_ORDER_4K,
IOMMUF_readable | IOMMUF_writable, &flush_flags);

if ( rc )
diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index 1831dc66b0..13f68dc93d 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -146,23 +146,23 @@ enum
#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 long page_count, unsigned int flags,
unsigned int *flush_flags);
int __must_check iommu_unmap(struct domain *d, dfn_t dfn,
- unsigned int page_order,
+ unsigned long page_count,
unsigned int *flush_flags);

int __must_check iommu_legacy_map(struct domain *d, dfn_t dfn, mfn_t mfn,
- unsigned int page_order,
+ unsigned long page_count,
unsigned int flags);
int __must_check iommu_legacy_unmap(struct domain *d, dfn_t dfn,
- unsigned int page_order);
+ unsigned long page_count);

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 long page_count,
unsigned int flush_flags);
int __must_check iommu_iotlb_flush_all(struct domain *d,
unsigned int flush_flags);
@@ -281,7 +281,7 @@ 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 long page_count,
unsigned int flush_flags);
int __must_check (*iotlb_flush_all)(struct domain *d);
int (*get_reserved_device_memory)(iommu_grdm_t *, void *);
--
2.20.1