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vfio/pci: Extract mdev check into an helper 

In preparation to skip initialization of the HostIOMMUDevice for mdev,
extract the checks that validate if a device is an mdev into helpers.

A vfio_device_is_mdev() is created, and subsystems consult VFIODevice::mdev
to check if it's mdev or not.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
This commit is contained in:
Joao Martins 2024-07-19 13:04:49 +01:00 committed by Cédric Le Goater
parent 07321a6d08
commit 13e522f644
3 changed files with 19 additions and 9 deletions
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14
hw/vfio/helpers.c
View File

@ -675,3 +675,17 @@ int vfio_device_get_aw_bits(VFIODevice *vdev)
return HOST_IOMMU_DEVICE_CAP_AW_BITS_MAX;
}
bool vfio_device_is_mdev(VFIODevice *vbasedev)
{
g_autofree char *subsys = NULL;
g_autofree char *tmp = NULL;
if (!vbasedev->sysfsdev) {
return false;
}
tmp = g_strdup_printf("%s/subsystem", vbasedev->sysfsdev);
subsys = realpath(tmp, NULL);
return subsys && (strcmp(subsys, "/sys/bus/mdev") == 0);
}

12
hw/vfio/pci.c
View File

@ -2963,12 +2963,9 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
ERRP_GUARD();
VFIOPCIDevice *vdev = VFIO_PCI(pdev);
VFIODevice *vbasedev = &vdev->vbasedev;
char *subsys;
int i, ret;
bool is_mdev;
char uuid[UUID_STR_LEN];
g_autofree char *name = NULL;
g_autofree char *tmp = NULL;
if (vbasedev->fd < 0 && !vbasedev->sysfsdev) {
if (!(~vdev->host.domain || ~vdev->host.bus ||
@ -2997,14 +2994,11 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
* stays in sync with the active working set of the guest driver. Prevent
* the x-balloon-allowed option unless this is minimally an mdev device.
*/
tmp = g_strdup_printf("%s/subsystem", vbasedev->sysfsdev);
subsys = realpath(tmp, NULL);
is_mdev = subsys && (strcmp(subsys, "/sys/bus/mdev") == 0);
free(subsys);
vbasedev->mdev = vfio_device_is_mdev(vbasedev);
trace_vfio_mdev(vbasedev->name, is_mdev);
trace_vfio_mdev(vbasedev->name, vbasedev->mdev);
if (vbasedev->ram_block_discard_allowed && !is_mdev) {
if (vbasedev->ram_block_discard_allowed && !vbasedev->mdev) {
error_setg(errp, "x-balloon-allowed only potentially compatible "
"with mdev devices");
goto error;

2
include/hw/vfio/vfio-common.h
View File

@ -116,6 +116,7 @@ typedef struct VFIODevice {
DeviceState *dev;
int fd;
int type;
bool mdev;
bool reset_works;
bool needs_reset;
bool no_mmap;
@ -231,6 +232,7 @@ void vfio_region_exit(VFIORegion *region);
void vfio_region_finalize(VFIORegion *region);
void vfio_reset_handler(void *opaque);
struct vfio_device_info *vfio_get_device_info(int fd);
bool vfio_device_is_mdev(VFIODevice *vbasedev);
bool vfio_attach_device(char *name, VFIODevice *vbasedev,
AddressSpace *as, Error **errp);
void vfio_detach_device(VFIODevice *vbasedev);