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[PATCH v2 2/5] memory: Add IOMMUTLBEvent
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From: |
Eugenio Pérez |
|
Subject: |
[PATCH v2 2/5] memory: Add IOMMUTLBEvent |
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Date: |
Mon, 19 Oct 2020 12:43:29 +0200 |
This way we can tell between regular IOMMUTLBEntry (entry of IOMMU
hardware) and notifications.
In the notifications, we set explicitly if it is a MAPs or an UNMAP,
instead of trusting in entry permissions to differentiate them.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
---
include/exec/memory.h | 27 +++++++------
hw/arm/smmu-common.c | 13 ++++---
hw/arm/smmuv3.c | 13 ++++---
hw/i386/intel_iommu.c | 88 ++++++++++++++++++++++++-------------------
hw/misc/tz-mpc.c | 32 +++++++++-------
hw/ppc/spapr_iommu.c | 15 ++++----
softmmu/memory.c | 20 +++++-----
7 files changed, 111 insertions(+), 97 deletions(-)
diff --git a/include/exec/memory.h b/include/exec/memory.h
index ac6bca1ba0..ab60870c76 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -101,6 +101,11 @@ struct IOMMUNotifier {
};
typedef struct IOMMUNotifier IOMMUNotifier;
+typedef struct IOMMUTLBEvent {
+ IOMMUNotifierFlag type;
+ IOMMUTLBEntry entry;
+} IOMMUTLBEvent;
+
/* RAM is pre-allocated and passed into qemu_ram_alloc_from_ptr */
#define RAM_PREALLOC (1 << 0)
@@ -1280,24 +1285,18 @@ uint64_t
memory_region_iommu_get_min_page_size(IOMMUMemoryRegion *iommu_mr);
/**
* memory_region_notify_iommu: notify a change in an IOMMU translation entry.
*
- * The notification type will be decided by entry.perm bits:
- *
- * - For UNMAP (cache invalidation) notifies: set entry.perm to IOMMU_NONE.
- * - For MAP (newly added entry) notifies: set entry.perm to the
- * permission of the page (which is definitely !IOMMU_NONE).
- *
* Note: for any IOMMU implementation, an in-place mapping change
* should be notified with an UNMAP followed by a MAP.
*
* @iommu_mr: the memory region that was changed
* @iommu_idx: the IOMMU index for the translation table which has changed
- * @entry: the new entry in the IOMMU translation table. The entry
- * replaces all old entries for the same virtual I/O address range.
- * Deleted entries have .@perm == 0.
+ * @event: TLB event with the new entry in the IOMMU translation table.
+ * The entry replaces all old entries for the same virtual I/O address
+ * range.
*/
void memory_region_notify_iommu(IOMMUMemoryRegion *iommu_mr,
int iommu_idx,
- IOMMUTLBEntry entry);
+ IOMMUTLBEvent event);
/**
* memory_region_notify_iommu_one: notify a change in an IOMMU translation
@@ -1307,12 +1306,12 @@ void memory_region_notify_iommu(IOMMUMemoryRegion
*iommu_mr,
* notifies a specific notifier, not all of them.
*
* @notifier: the notifier to be notified
- * @entry: the new entry in the IOMMU translation table. The entry
- * replaces all old entries for the same virtual I/O address range.
- * Deleted entries have .@perm == 0.
+ * @event: TLB event with the new entry in the IOMMU translation table.
+ * The entry replaces all old entries for the same virtual I/O address
+ * range.
*/
void memory_region_notify_iommu_one(IOMMUNotifier *notifier,
- IOMMUTLBEntry *entry);
+ IOMMUTLBEvent *event);
/**
* memory_region_register_iommu_notifier: register a notifier for changes to
diff --git a/hw/arm/smmu-common.c b/hw/arm/smmu-common.c
index 88d2c454f0..405d5c5325 100644
--- a/hw/arm/smmu-common.c
+++ b/hw/arm/smmu-common.c
@@ -465,14 +465,15 @@ IOMMUMemoryRegion *smmu_iommu_mr(SMMUState *s, uint32_t
sid)
/* Unmap the whole notifier's range */
static void smmu_unmap_notifier_range(IOMMUNotifier *n)
{
- IOMMUTLBEntry entry;
+ IOMMUTLBEvent event;
- entry.target_as = &address_space_memory;
- entry.iova = n->start;
- entry.perm = IOMMU_NONE;
- entry.addr_mask = n->end - n->start;
+ event.type = IOMMU_NOTIFIER_UNMAP;
+ event.entry.target_as = &address_space_memory;
+ event.entry.iova = n->start;
+ event.entry.perm = IOMMU_NONE;
+ event.entry.addr_mask = n->end - n->start;
- memory_region_notify_iommu_one(n, &entry);
+ memory_region_notify_iommu_one(n, &event);
}
/* Unmap all notifiers attached to @mr */
diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c
index 0a893ae918..62b0e289ca 100644
--- a/hw/arm/smmuv3.c
+++ b/hw/arm/smmuv3.c
@@ -799,7 +799,7 @@ static void smmuv3_notify_iova(IOMMUMemoryRegion *mr,
uint8_t tg, uint64_t num_pages)
{
SMMUDevice *sdev = container_of(mr, SMMUDevice, iommu);
- IOMMUTLBEntry entry;
+ IOMMUTLBEvent event;
uint8_t granule = tg;
if (!tg) {
@@ -822,12 +822,13 @@ static void smmuv3_notify_iova(IOMMUMemoryRegion *mr,
granule = tt->granule_sz;
}
- entry.target_as = &address_space_memory;
- entry.iova = iova;
- entry.addr_mask = num_pages * (1 << granule) - 1;
- entry.perm = IOMMU_NONE;
+ event.type = IOMMU_NOTIFIER_UNMAP;
+ event.entry.target_as = &address_space_memory;
+ event.entry.iova = iova;
+ event.entry.addr_mask = num_pages * (1 << granule) - 1;
+ event.entry.perm = IOMMU_NONE;
- memory_region_notify_iommu_one(n, &entry);
+ memory_region_notify_iommu_one(n, &event);
}
/* invalidate an asid/iova range tuple in all mr's */
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 56bab589d4..3976161317 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -1073,7 +1073,7 @@ static int vtd_iova_to_slpte(IntelIOMMUState *s,
VTDContextEntry *ce,
}
}
-typedef int (*vtd_page_walk_hook)(IOMMUTLBEntry *entry, void *private);
+typedef int (*vtd_page_walk_hook)(IOMMUTLBEvent *event, void *private);
/**
* Constant information used during page walking
@@ -1094,11 +1094,12 @@ typedef struct {
uint16_t domain_id;
} vtd_page_walk_info;
-static int vtd_page_walk_one(IOMMUTLBEntry *entry, vtd_page_walk_info *info)
+static int vtd_page_walk_one(IOMMUTLBEvent *event, vtd_page_walk_info *info)
{
VTDAddressSpace *as = info->as;
vtd_page_walk_hook hook_fn = info->hook_fn;
void *private = info->private;
+ IOMMUTLBEntry *entry = &event->entry;
DMAMap target = {
.iova = entry->iova,
.size = entry->addr_mask,
@@ -1107,7 +1108,7 @@ static int vtd_page_walk_one(IOMMUTLBEntry *entry,
vtd_page_walk_info *info)
};
DMAMap *mapped = iova_tree_find(as->iova_tree, &target);
- if (entry->perm == IOMMU_NONE && !info->notify_unmap) {
+ if (event->type == IOMMU_NOTIFIER_UNMAP && !info->notify_unmap) {
trace_vtd_page_walk_one_skip_unmap(entry->iova, entry->addr_mask);
return 0;
}
@@ -1115,7 +1116,7 @@ static int vtd_page_walk_one(IOMMUTLBEntry *entry,
vtd_page_walk_info *info)
assert(hook_fn);
/* Update local IOVA mapped ranges */
- if (entry->perm) {
+ if (event->type == IOMMU_NOTIFIER_MAP) {
if (mapped) {
/* If it's exactly the same translation, skip */
if (!memcmp(mapped, &target, sizeof(target))) {
@@ -1141,19 +1142,21 @@ static int vtd_page_walk_one(IOMMUTLBEntry *entry,
vtd_page_walk_info *info)
int ret;
/* Emulate an UNMAP */
+ event->type = IOMMU_NOTIFIER_UNMAP;
entry->perm = IOMMU_NONE;
trace_vtd_page_walk_one(info->domain_id,
entry->iova,
entry->translated_addr,
entry->addr_mask,
entry->perm);
- ret = hook_fn(entry, private);
+ ret = hook_fn(event, private);
if (ret) {
return ret;
}
/* Drop any existing mapping */
iova_tree_remove(as->iova_tree, &target);
- /* Recover the correct permission */
+ /* Recover the correct type */
+ event->type = IOMMU_NOTIFIER_MAP;
entry->perm = cache_perm;
}
}
@@ -1170,7 +1173,7 @@ static int vtd_page_walk_one(IOMMUTLBEntry *entry,
vtd_page_walk_info *info)
trace_vtd_page_walk_one(info->domain_id, entry->iova,
entry->translated_addr, entry->addr_mask,
entry->perm);
- return hook_fn(entry, private);
+ return hook_fn(event, private);
}
/**
@@ -1191,7 +1194,7 @@ static int vtd_page_walk_level(dma_addr_t addr, uint64_t
start,
uint32_t offset;
uint64_t slpte;
uint64_t subpage_size, subpage_mask;
- IOMMUTLBEntry entry;
+ IOMMUTLBEvent event;
uint64_t iova = start;
uint64_t iova_next;
int ret = 0;
@@ -1245,13 +1248,15 @@ static int vtd_page_walk_level(dma_addr_t addr,
uint64_t start,
*
* In either case, we send an IOTLB notification down.
*/
- entry.target_as = &address_space_memory;
- entry.iova = iova & subpage_mask;
- entry.perm = IOMMU_ACCESS_FLAG(read_cur, write_cur);
- entry.addr_mask = ~subpage_mask;
+ event.entry.target_as = &address_space_memory;
+ event.entry.iova = iova & subpage_mask;
+ event.entry.perm = IOMMU_ACCESS_FLAG(read_cur, write_cur);
+ event.entry.addr_mask = ~subpage_mask;
/* NOTE: this is only meaningful if entry_valid == true */
- entry.translated_addr = vtd_get_slpte_addr(slpte, info->aw);
- ret = vtd_page_walk_one(&entry, info);
+ event.entry.translated_addr = vtd_get_slpte_addr(slpte, info->aw);
+ event.type = event.entry.perm ? IOMMU_NOTIFIER_MAP :
+ IOMMU_NOTIFIER_UNMAP;
+ ret = vtd_page_walk_one(&event, info);
}
if (ret < 0) {
@@ -1430,10 +1435,10 @@ static int vtd_dev_to_context_entry(IntelIOMMUState *s,
uint8_t bus_num,
return 0;
}
-static int vtd_sync_shadow_page_hook(IOMMUTLBEntry *entry,
+static int vtd_sync_shadow_page_hook(IOMMUTLBEvent *event,
void *private)
{
- memory_region_notify_iommu((IOMMUMemoryRegion *)private, 0, *entry);
+ memory_region_notify_iommu(private, 0, *event);
return 0;
}
@@ -1993,14 +1998,17 @@ static void
vtd_iotlb_page_invalidate_notify(IntelIOMMUState *s,
* page tables. We just deliver the PSI down to
* invalidate caches.
*/
- IOMMUTLBEntry entry = {
- .target_as = &address_space_memory,
- .iova = addr,
- .translated_addr = 0,
- .addr_mask = size - 1,
- .perm = IOMMU_NONE,
+ IOMMUTLBEvent event = {
+ .type = IOMMU_NOTIFIER_UNMAP,
+ .entry = {
+ .target_as = &address_space_memory,
+ .iova = addr,
+ .translated_addr = 0,
+ .addr_mask = size - 1,
+ .perm = IOMMU_NONE,
+ },
};
- memory_region_notify_iommu(&vtd_as->iommu, 0, entry);
+ memory_region_notify_iommu(&vtd_as->iommu, 0, event);
}
}
}
@@ -2412,7 +2420,7 @@ static bool vtd_process_device_iotlb_desc(IntelIOMMUState
*s,
VTDInvDesc *inv_desc)
{
VTDAddressSpace *vtd_dev_as;
- IOMMUTLBEntry entry;
+ IOMMUTLBEvent event;
struct VTDBus *vtd_bus;
hwaddr addr;
uint64_t sz;
@@ -2460,12 +2468,13 @@ static bool
vtd_process_device_iotlb_desc(IntelIOMMUState *s,
sz = VTD_PAGE_SIZE;
}
- entry.target_as = &vtd_dev_as->as;
- entry.addr_mask = sz - 1;
- entry.iova = addr;
- entry.perm = IOMMU_NONE;
- entry.translated_addr = 0;
- memory_region_notify_iommu(&vtd_dev_as->iommu, 0, entry);
+ event.type = IOMMU_NOTIFIER_UNMAP;
+ event.entry.target_as = &vtd_dev_as->as;
+ event.entry.addr_mask = sz - 1;
+ event.entry.iova = addr;
+ event.entry.perm = IOMMU_NONE;
+ event.entry.translated_addr = 0;
+ memory_region_notify_iommu(&vtd_dev_as->iommu, 0, event);
done:
return true;
@@ -3485,19 +3494,20 @@ static void vtd_address_space_unmap(VTDAddressSpace
*as, IOMMUNotifier *n)
size = remain = end - start + 1;
while (remain >= VTD_PAGE_SIZE) {
- IOMMUTLBEntry entry;
+ IOMMUTLBEvent event;
uint64_t mask = get_naturally_aligned_size(start, remain, s->aw_bits);
assert(mask);
- entry.iova = start;
- entry.addr_mask = mask - 1;
- entry.target_as = &address_space_memory;
- entry.perm = IOMMU_NONE;
+ event.type = IOMMU_NOTIFIER_UNMAP;
+ event.entry.iova = start;
+ event.entry.addr_mask = mask - 1;
+ event.entry.target_as = &address_space_memory;
+ event.entry.perm = IOMMU_NONE;
/* This field is meaningless for unmap */
- entry.translated_addr = 0;
+ event.entry.translated_addr = 0;
- memory_region_notify_iommu_one(n, &entry);
+ memory_region_notify_iommu_one(n, &event);
start += mask;
remain -= mask;
@@ -3533,9 +3543,9 @@ static void vtd_address_space_refresh_all(IntelIOMMUState
*s)
vtd_switch_address_space_all(s);
}
-static int vtd_replay_hook(IOMMUTLBEntry *entry, void *private)
+static int vtd_replay_hook(IOMMUTLBEvent *event, void *private)
{
- memory_region_notify_iommu_one((IOMMUNotifier *)private, entry);
+ memory_region_notify_iommu_one(private, event);
return 0;
}
diff --git a/hw/misc/tz-mpc.c b/hw/misc/tz-mpc.c
index 98f151237f..30481e1c90 100644
--- a/hw/misc/tz-mpc.c
+++ b/hw/misc/tz-mpc.c
@@ -82,8 +82,10 @@ static void tz_mpc_iommu_notify(TZMPC *s, uint32_t lutidx,
/* Called when the LUT word at lutidx has changed from oldlut to newlut;
* must call the IOMMU notifiers for the changed blocks.
*/
- IOMMUTLBEntry entry = {
- .addr_mask = s->blocksize - 1,
+ IOMMUTLBEvent event = {
+ .entry = {
+ .addr_mask = s->blocksize - 1,
+ }
};
hwaddr addr = lutidx * s->blocksize * 32;
int i;
@@ -100,26 +102,28 @@ static void tz_mpc_iommu_notify(TZMPC *s, uint32_t lutidx,
block_is_ns = newlut & (1 << i);
trace_tz_mpc_iommu_notify(addr);
- entry.iova = addr;
- entry.translated_addr = addr;
+ event.entry.iova = addr;
+ event.entry.translated_addr = addr;
- entry.perm = IOMMU_NONE;
- memory_region_notify_iommu(&s->upstream, IOMMU_IDX_S, entry);
- memory_region_notify_iommu(&s->upstream, IOMMU_IDX_NS, entry);
+ event.type = IOMMU_NOTIFIER_UNMAP;
+ event.entry.perm = IOMMU_NONE;
+ memory_region_notify_iommu(&s->upstream, IOMMU_IDX_S, event);
+ memory_region_notify_iommu(&s->upstream, IOMMU_IDX_NS, event);
- entry.perm = IOMMU_RW;
+ event.type = IOMMU_NOTIFIER_MAP;
+ event.entry.perm = IOMMU_RW;
if (block_is_ns) {
- entry.target_as = &s->blocked_io_as;
+ event.entry.target_as = &s->blocked_io_as;
} else {
- entry.target_as = &s->downstream_as;
+ event.entry.target_as = &s->downstream_as;
}
- memory_region_notify_iommu(&s->upstream, IOMMU_IDX_S, entry);
+ memory_region_notify_iommu(&s->upstream, IOMMU_IDX_S, event);
if (block_is_ns) {
- entry.target_as = &s->downstream_as;
+ event.entry.target_as = &s->downstream_as;
} else {
- entry.target_as = &s->blocked_io_as;
+ event.entry.target_as = &s->blocked_io_as;
}
- memory_region_notify_iommu(&s->upstream, IOMMU_IDX_NS, entry);
+ memory_region_notify_iommu(&s->upstream, IOMMU_IDX_NS, event);
}
}
diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c
index 0fecabc135..8bc3cff05d 100644
--- a/hw/ppc/spapr_iommu.c
+++ b/hw/ppc/spapr_iommu.c
@@ -445,7 +445,7 @@ static void spapr_tce_reset(DeviceState *dev)
static target_ulong put_tce_emu(SpaprTceTable *tcet, target_ulong ioba,
target_ulong tce)
{
- IOMMUTLBEntry entry;
+ IOMMUTLBEvent event;
hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
@@ -457,12 +457,13 @@ static target_ulong put_tce_emu(SpaprTceTable *tcet,
target_ulong ioba,
tcet->table[index] = tce;
- entry.target_as = &address_space_memory,
- entry.iova = (ioba - tcet->bus_offset) & page_mask;
- entry.translated_addr = tce & page_mask;
- entry.addr_mask = ~page_mask;
- entry.perm = spapr_tce_iommu_access_flags(tce);
- memory_region_notify_iommu(&tcet->iommu, 0, entry);
+ event.entry.target_as = &address_space_memory,
+ event.entry.iova = (ioba - tcet->bus_offset) & page_mask;
+ event.entry.translated_addr = tce & page_mask;
+ event.entry.addr_mask = ~page_mask;
+ event.entry.perm = spapr_tce_iommu_access_flags(tce);
+ event.type = entry.perm ? IOMMU_NOTIFIER_MAP : IOMMU_NOTIFIER_UNMAP;
+ memory_region_notify_iommu(&tcet->iommu, 0, event);
return H_SUCCESS;
}
diff --git a/softmmu/memory.c b/softmmu/memory.c
index f37a4569ac..b87e9f688e 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -1906,11 +1906,15 @@ void
memory_region_unregister_iommu_notifier(MemoryRegion *mr,
}
void memory_region_notify_iommu_one(IOMMUNotifier *notifier,
- IOMMUTLBEntry *entry)
+ IOMMUTLBEvent *event)
{
- IOMMUNotifierFlag request_flags;
+ IOMMUTLBEntry *entry = &event->entry;
hwaddr entry_end = entry->iova + entry->addr_mask;
+ if (event->type == IOMMU_NOTIFIER_UNMAP) {
+ assert(entry->perm == IOMMU_NONE);
+ }
+
/*
* Skip the notification if the notification does not overlap
* with registered range.
@@ -1921,20 +1925,14 @@ void memory_region_notify_iommu_one(IOMMUNotifier
*notifier,
assert(entry->iova >= notifier->start && entry_end <= notifier->end);
- if (entry->perm & IOMMU_RW) {
- request_flags = IOMMU_NOTIFIER_MAP;
- } else {
- request_flags = IOMMU_NOTIFIER_UNMAP;
- }
-
- if (notifier->notifier_flags & request_flags) {
+ if (event->type & notifier->notifier_flags) {
notifier->notify(notifier, entry);
}
}
void memory_region_notify_iommu(IOMMUMemoryRegion *iommu_mr,
int iommu_idx,
- IOMMUTLBEntry entry)
+ IOMMUTLBEvent event)
{
IOMMUNotifier *iommu_notifier;
@@ -1942,7 +1940,7 @@ void memory_region_notify_iommu(IOMMUMemoryRegion
*iommu_mr,
IOMMU_NOTIFIER_FOREACH(iommu_notifier, iommu_mr) {
if (iommu_notifier->iommu_idx == iommu_idx) {
- memory_region_notify_iommu_one(iommu_notifier, &entry);
+ memory_region_notify_iommu_one(iommu_notifier, &event);
}
}
}
--
2.18.1