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To: qemu-devel@nongnu.org
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John Johnson <john.g.johnson@oracle.com>,
Elena Ufimtseva <elena.ufimtseva@oracle.com>
Subject: [PATCH v8 08/28] vfio: add region cache
Date: Wed, 19 Feb 2025 15:48:38 +0100
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From: Jagannathan Raman <jag.raman@oracle.com>
Instead of requesting region information on demand with
VFIO_DEVICE_GET_REGION_INFO, maintain a cache: this will become
necessary for performance for vfio-user, where this call becomes a
message over the control socket, so is of higher overhead than the
traditional path.
Originally-by: John Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: John Levon <john.levon@nutanix.com>
---
hw/vfio/ccw.c | 5 -----
hw/vfio/common.c | 12 ++++++++++++
hw/vfio/container.c | 10 ++++++++++
hw/vfio/helpers.c | 21 ++++++++++++++++-----
hw/vfio/igd.c | 8 ++++----
hw/vfio/pci.c | 8 ++++----
include/hw/vfio/vfio-common.h | 1 +
7 files changed, 47 insertions(+), 18 deletions(-)
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 67bc137f9b..22378d50bc 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -510,7 +510,6 @@ static bool vfio_ccw_get_region(VFIOCCWDevice *vcdev, E=
rror **errp)
=20
vcdev->io_region_offset =3D info->offset;
vcdev->io_region =3D g_malloc0(info->size);
- g_free(info);
=20
/* check for the optional async command region */
ret =3D vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
@@ -523,7 +522,6 @@ static bool vfio_ccw_get_region(VFIOCCWDevice *vcdev, E=
rror **errp)
}
vcdev->async_cmd_region_offset =3D info->offset;
vcdev->async_cmd_region =3D g_malloc0(info->size);
- g_free(info);
}
=20
ret =3D vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
@@ -536,7 +534,6 @@ static bool vfio_ccw_get_region(VFIOCCWDevice *vcdev, E=
rror **errp)
}
vcdev->schib_region_offset =3D info->offset;
vcdev->schib_region =3D g_malloc(info->size);
- g_free(info);
}
=20
ret =3D vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
@@ -550,7 +547,6 @@ static bool vfio_ccw_get_region(VFIOCCWDevice *vcdev, E=
rror **errp)
}
vcdev->crw_region_offset =3D info->offset;
vcdev->crw_region =3D g_malloc(info->size);
- g_free(info);
}
=20
return true;
@@ -560,7 +556,6 @@ out_err:
g_free(vcdev->schib_region);
g_free(vcdev->async_cmd_region);
g_free(vcdev->io_region);
- g_free(info);
return false;
}
=20
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 4434e0a0a2..1866b3d3c5 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1569,6 +1569,16 @@ retry:
return info;
}
=20
+static void vfio_get_all_regions(VFIODevice *vbasedev)
+{
+ struct vfio_region_info *info;
+ int i;
+
+ for (i =3D 0; i < vbasedev->num_regions; i++) {
+ vfio_get_region_info(vbasedev, i, &info);
+ }
+}
+
void vfio_prepare_device(VFIODevice *vbasedev, VFIOContainerBase *bcontain=
er,
VFIOGroup *group, struct vfio_device_info *info)
{
@@ -1586,6 +1596,8 @@ void vfio_prepare_device(VFIODevice *vbasedev, VFIOCo=
ntainerBase *bcontainer,
}
=20
QLIST_INSERT_HEAD(&vfio_device_list, vbasedev, global_next);
+
+ vfio_get_all_regions(vbasedev);
}
=20
bool vfio_attach_device_by_iommu_type(const char *iommu_type, char *name,
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 37a3befbc5..36cd245c92 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -886,6 +886,16 @@ static bool vfio_get_device(VFIOGroup *group, const ch=
ar *name,
=20
static void vfio_put_base_device(VFIODevice *vbasedev)
{
+ if (vbasedev->regions !=3D NULL) {
+ int i;
+
+ for (i =3D 0; i < vbasedev->num_regions; i++) {
+ g_free(vbasedev->regions[i]);
+ }
+ g_free(vbasedev->regions);
+ vbasedev->regions =3D NULL;
+ }
+
if (!vbasedev->group) {
return;
}
diff --git a/hw/vfio/helpers.c b/hw/vfio/helpers.c
index 4b255d4f3a..3c923d23b9 100644
--- a/hw/vfio/helpers.c
+++ b/hw/vfio/helpers.c
@@ -345,7 +345,7 @@ static int vfio_setup_region_sparse_mmaps(VFIORegion *r=
egion,
int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *regio=
n,
int index, const char *name)
{
- g_autofree struct vfio_region_info *info =3D NULL;
+ struct vfio_region_info *info =3D NULL;
int ret;
=20
ret =3D vfio_get_region_info(vbasedev, index, &info);
@@ -562,6 +562,17 @@ int vfio_get_region_info(VFIODevice *vbasedev, int ind=
ex,
{
size_t argsz =3D sizeof(struct vfio_region_info);
=20
+ /* create region cache */
+ if (vbasedev->regions =3D=3D NULL) {
+ vbasedev->regions =3D g_new0(struct vfio_region_info *,
+ vbasedev->num_regions);
+ }
+ /* check cache */
+ if (vbasedev->regions[index] !=3D NULL) {
+ *info =3D vbasedev->regions[index];
+ return 0;
+ }
+
*info =3D g_malloc0(argsz);
=20
(*info)->index =3D index;
@@ -581,6 +592,9 @@ retry:
goto retry;
}
=20
+ /* fill cache */
+ vbasedev->regions[index] =3D *info;
+
return 0;
}
=20
@@ -599,7 +613,6 @@ int vfio_get_dev_region_info(VFIODevice *vbasedev, uint=
32_t type,
=20
hdr =3D vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE);
if (!hdr) {
- g_free(*info);
continue;
}
=20
@@ -611,8 +624,6 @@ int vfio_get_dev_region_info(VFIODevice *vbasedev, uint=
32_t type,
if (cap_type->type =3D=3D type && cap_type->subtype =3D=3D subtype=
) {
return 0;
}
-
- g_free(*info);
}
=20
*info =3D NULL;
@@ -621,7 +632,7 @@ int vfio_get_dev_region_info(VFIODevice *vbasedev, uint=
32_t type,
=20
bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_ty=
pe)
{
- g_autofree struct vfio_region_info *info =3D NULL;
+ struct vfio_region_info *info =3D NULL;
bool ret =3D false;
=20
if (!vfio_get_region_info(vbasedev, region, &info)) {
diff --git a/hw/vfio/igd.c b/hw/vfio/igd.c
index b1a237edd6..b5425ba9c0 100644
--- a/hw/vfio/igd.c
+++ b/hw/vfio/igd.c
@@ -490,10 +490,10 @@ void vfio_probe_igd_bar0_quirk(VFIOPCIDevice *vdev, i=
nt nr)
=20
void vfio_probe_igd_bar4_quirk(VFIOPCIDevice *vdev, int nr)
{
- g_autofree struct vfio_region_info *rom =3D NULL;
- g_autofree struct vfio_region_info *opregion =3D NULL;
- g_autofree struct vfio_region_info *host =3D NULL;
- g_autofree struct vfio_region_info *lpc =3D NULL;
+ struct vfio_region_info *rom =3D NULL;
+ struct vfio_region_info *opregion =3D NULL;
+ struct vfio_region_info *host =3D NULL;
+ struct vfio_region_info *lpc =3D NULL;
VFIOQuirk *quirk;
VFIOIGDQuirk *igd;
PCIDevice *lpc_bridge;
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 83fe329474..a4f99fc5e0 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -879,7 +879,7 @@ static void vfio_update_msi(VFIOPCIDevice *vdev)
=20
static void vfio_pci_load_rom(VFIOPCIDevice *vdev)
{
- g_autofree struct vfio_region_info *reg_info =3D NULL;
+ struct vfio_region_info *reg_info =3D NULL;
uint64_t size;
off_t off =3D 0;
ssize_t bytes;
@@ -2665,7 +2665,7 @@ static VFIODeviceOps vfio_pci_ops =3D {
bool vfio_populate_vga(VFIOPCIDevice *vdev, Error **errp)
{
VFIODevice *vbasedev =3D &vdev->vbasedev;
- g_autofree struct vfio_region_info *reg_info =3D NULL;
+ struct vfio_region_info *reg_info =3D NULL;
int ret;
=20
ret =3D vfio_get_region_info(vbasedev, VFIO_PCI_VGA_REGION_INDEX, ®=
_info);
@@ -2730,7 +2730,7 @@ bool vfio_populate_vga(VFIOPCIDevice *vdev, Error **e=
rrp)
static bool vfio_populate_device(VFIOPCIDevice *vdev, Error **errp)
{
VFIODevice *vbasedev =3D &vdev->vbasedev;
- g_autofree struct vfio_region_info *reg_info =3D NULL;
+ struct vfio_region_info *reg_info =3D NULL;
struct vfio_irq_info irq_info =3D { .argsz =3D sizeof(irq_info) };
int i, ret =3D -1;
=20
@@ -3177,7 +3177,7 @@ static void vfio_realize(PCIDevice *pdev, Error **err=
p)
=20
if (!vdev->igd_opregion &&
vdev->features & VFIO_FEATURE_ENABLE_IGD_OPREGION) {
- g_autofree struct vfio_region_info *opregion =3D NULL;
+ struct vfio_region_info *opregion =3D NULL;
=20
if (vdev->pdev.qdev.hotplugged) {
error_setg(errp,
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index ae3ecbd9f6..304030e71d 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -151,6 +151,7 @@ typedef struct VFIODevice {
IOMMUFDBackend *iommufd;
VFIOIOASHwpt *hwpt;
QLIST_ENTRY(VFIODevice) hwpt_next;
+ struct vfio_region_info **regions;
} VFIODevice;
=20
struct VFIODeviceOps {
--=20
2.34.1