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[RFC PATCH] vfio/common: Separate vfio-pci ranges
From: |
Cédric Le Goater |
Subject: |
[RFC PATCH] vfio/common: Separate vfio-pci ranges |
Date: |
Fri, 8 Sep 2023 09:14:38 +0200 |
From: Joao Martins <joao.m.martins@oracle.com>
QEMU computes the DMA logging ranges for two predefined ranges: 32-bit
and 64-bit. In the OVMF case, when the dynamic MMIO window is enabled,
QEMU includes in the 64-bit range the RAM regions at the lower part
and vfio-pci device RAM regions which are at the top of the address
space. This range contains a large gap and the size can be bigger than
the dirty tracking HW limits of some devices (MLX5 has a 2^42 limit).
To avoid such large ranges, introduce a new PCI range covering the
vfio-pci device RAM regions, this only if the addresses are above 4GB
to avoid breaking potential SeaBIOS guests.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
[ clg: - wrote commit log
- fixed overlapping 32-bit and PCI ranges when using SeaBIOS ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
hw/vfio/common.c | 51 +++++++++++++++++++++++++++++++++++++++-----
hw/vfio/trace-events | 2 +-
2 files changed, 47 insertions(+), 6 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index
237101d03844273f653d98b6d053a1ae9c05a247..a5548e3bebf999e6d9cef08bdaf1fbc3b437e5eb
100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -27,6 +27,7 @@
#include "hw/vfio/vfio-common.h"
#include "hw/vfio/vfio.h"
+#include "hw/vfio/pci.h"
#include "exec/address-spaces.h"
#include "exec/memory.h"
#include "exec/ram_addr.h"
@@ -1400,6 +1401,8 @@ typedef struct VFIODirtyRanges {
hwaddr max32;
hwaddr min64;
hwaddr max64;
+ hwaddr minpci;
+ hwaddr maxpci;
} VFIODirtyRanges;
typedef struct VFIODirtyRangesListener {
@@ -1408,6 +1411,31 @@ typedef struct VFIODirtyRangesListener {
MemoryListener listener;
} VFIODirtyRangesListener;
+static bool vfio_section_is_vfio_pci(MemoryRegionSection *section,
+ VFIOContainer *container)
+{
+ VFIOPCIDevice *pcidev;
+ VFIODevice *vbasedev;
+ VFIOGroup *group;
+ Object *owner;
+
+ owner = memory_region_owner(section->mr);
+
+ QLIST_FOREACH(group, &container->group_list, container_next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) {
+ continue;
+ }
+ pcidev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
+ if (OBJECT(pcidev) == owner) {
+ return true;
+ }
+ }
+ }
+
+ return false;
+}
+
static void vfio_dirty_tracking_update(MemoryListener *listener,
MemoryRegionSection *section)
{
@@ -1434,9 +1462,14 @@ static void vfio_dirty_tracking_update(MemoryListener
*listener,
* would be an IOVATree but that has a much bigger runtime overhead and
* unnecessary complexity.
*/
- min = (end <= UINT32_MAX) ? &range->min32 : &range->min64;
- max = (end <= UINT32_MAX) ? &range->max32 : &range->max64;
-
+ if (vfio_section_is_vfio_pci(section, dirty->container) &&
+ iova >= UINT32_MAX) {
+ min = &range->minpci;
+ max = &range->maxpci;
+ } else {
+ min = (end <= UINT32_MAX) ? &range->min32 : &range->min64;
+ max = (end <= UINT32_MAX) ? &range->max32 : &range->max64;
+ }
if (*min > iova) {
*min = iova;
}
@@ -1461,6 +1494,7 @@ static void vfio_dirty_tracking_init(VFIOContainer
*container,
memset(&dirty, 0, sizeof(dirty));
dirty.ranges.min32 = UINT32_MAX;
dirty.ranges.min64 = UINT64_MAX;
+ dirty.ranges.minpci = UINT64_MAX;
dirty.listener = vfio_dirty_tracking_listener;
dirty.container = container;
@@ -1531,7 +1565,8 @@
vfio_device_feature_dma_logging_start_create(VFIOContainer *container,
* DMA logging uAPI guarantees to support at least a number of ranges that
* fits into a single host kernel base page.
*/
- control->num_ranges = !!tracking->max32 + !!tracking->max64;
+ control->num_ranges = !!tracking->max32 + !!tracking->max64 +
+ !!tracking->maxpci;
ranges = g_try_new0(struct vfio_device_feature_dma_logging_range,
control->num_ranges);
if (!ranges) {
@@ -1550,11 +1585,17 @@
vfio_device_feature_dma_logging_start_create(VFIOContainer *container,
if (tracking->max64) {
ranges->iova = tracking->min64;
ranges->length = (tracking->max64 - tracking->min64) + 1;
+ ranges++;
+ }
+ if (tracking->maxpci) {
+ ranges->iova = tracking->minpci;
+ ranges->length = (tracking->maxpci - tracking->minpci) + 1;
}
trace_vfio_device_dirty_tracking_start(control->num_ranges,
tracking->min32, tracking->max32,
- tracking->min64, tracking->max64);
+ tracking->min64, tracking->max64,
+ tracking->minpci, tracking->maxpci);
return feature;
}
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index
ce61b10827b6a1203a5fe1a87a76d96f25c11345..ab52c6bb7f0c11e51fefef231c108d0c9381547e
100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -104,7 +104,7 @@ vfio_known_safe_misalignment(const char *name, uint64_t
iova, uint64_t offset_wi
vfio_listener_region_add_no_dma_map(const char *name, uint64_t iova, uint64_t
size, uint64_t page_size) "Region \"%s\" 0x%"PRIx64" size=0x%"PRIx64" is not
aligned to 0x%"PRIx64" and cannot be mapped for DMA"
vfio_listener_region_del(uint64_t start, uint64_t end) "region_del 0x%"PRIx64"
- 0x%"PRIx64
vfio_device_dirty_tracking_update(uint64_t start, uint64_t end, uint64_t min,
uint64_t max) "section 0x%"PRIx64" - 0x%"PRIx64" -> update [0x%"PRIx64" -
0x%"PRIx64"]"
-vfio_device_dirty_tracking_start(int nr_ranges, uint64_t min32, uint64_t
max32, uint64_t min64, uint64_t max64) "nr_ranges %d 32:[0x%"PRIx64" -
0x%"PRIx64"], 64:[0x%"PRIx64" - 0x%"PRIx64"]"
+vfio_device_dirty_tracking_start(int nr_ranges, uint64_t min32, uint64_t
max32, uint64_t min64, uint64_t max64, uint64_t minpci, uint64_t maxpci)
"nr_ranges %d 32:[0x%"PRIx64" - 0x%"PRIx64"], 64:[0x%"PRIx64" - 0x%"PRIx64"],
pci:[0x%"PRIx64" - 0x%"PRIx64"]"
vfio_disconnect_container(int fd) "close container->fd=%d"
vfio_put_group(int fd) "close group->fd=%d"
vfio_get_device(const char * name, unsigned int flags, unsigned int
num_regions, unsigned int num_irqs) "Device %s flags: %u, regions: %u, irqs: %u"
--
2.41.0
- [RFC PATCH] vfio/common: Separate vfio-pci ranges,
Cédric Le Goater <=