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s390x/pci: let intercept devices have separate PCI groups

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Let's use the reserved pool of simulated PCI groups to allow intercept
devices to have separate groups from interpreted devices as some group
values may be different. If we run out of simulated PCI groups, subsequent
intercept devices just get the default group.
Furthermore, if we encounter any PCI groups from hostdevs that are marked
as simulated, let's just assign them to the default group to avoid
conflicts between host simulated groups and our own simulated groups.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Message-Id: <20220902172737.170349-7-mjrosato@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Matthew Rosato 2022-09-02 13:27:35 -04:00 committed by Thomas Huth
parent d0bc7091c2
commit 30dcf4f7fd
3 changed files with 59 additions and 6 deletions
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19
hw/s390x/s390-pci-bus.c
View File

@ -748,13 +748,14 @@ static void s390_pci_iommu_free(S390pciState *s, PCIBus *bus, int32_t devfn)
object_unref(OBJECT(iommu));
}
S390PCIGroup *s390_group_create(int id)
S390PCIGroup *s390_group_create(int id, int host_id)
{
S390PCIGroup *group;
S390pciState *s = s390_get_phb();
group = g_new0(S390PCIGroup, 1);
group->id = id;
group->host_id = host_id;
QTAILQ_INSERT_TAIL(&s->zpci_groups, group, link);
return group;
}
@ -772,12 +773,25 @@ S390PCIGroup *s390_group_find(int id)
return NULL;
}
S390PCIGroup *s390_group_find_host_sim(int host_id)
{
S390PCIGroup *group;
S390pciState *s = s390_get_phb();
QTAILQ_FOREACH(group, &s->zpci_groups, link) {
if (group->id >= ZPCI_SIM_GRP_START && group->host_id == host_id) {
return group;
}
}
return NULL;
}
static void s390_pci_init_default_group(void)
{
S390PCIGroup *group;
ClpRspQueryPciGrp *resgrp;
group = s390_group_create(ZPCI_DEFAULT_FN_GRP);
group = s390_group_create(ZPCI_DEFAULT_FN_GRP, ZPCI_DEFAULT_FN_GRP);
resgrp = &group->zpci_group;
resgrp->fr = 1;
resgrp->dasm = 0;
@ -825,6 +839,7 @@ static void s390_pcihost_realize(DeviceState *dev, Error **errp)
NULL, g_free);
s->zpci_table = g_hash_table_new_full(g_int_hash, g_int_equal, NULL, NULL);
s->bus_no = 0;
s->next_sim_grp = ZPCI_SIM_GRP_START;
QTAILQ_INIT(&s->pending_sei);
QTAILQ_INIT(&s->zpci_devs);
QTAILQ_INIT(&s->zpci_dma_limit);

40
hw/s390x/s390-pci-vfio.c
View File

@ -150,13 +150,18 @@ static void s390_pci_read_group(S390PCIBusDevice *pbdev,
{
struct vfio_info_cap_header *hdr;
struct vfio_device_info_cap_zpci_group *cap;
S390pciState *s = s390_get_phb();
ClpRspQueryPciGrp *resgrp;
VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
uint8_t start_gid = pbdev->zpci_fn.pfgid;
hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_GROUP);
/* If capability not provided, just use the default group */
if (hdr == NULL) {
/*
* If capability not provided or the underlying hostdev is simulated, just
* use the default group.
*/
if (hdr == NULL || pbdev->zpci_fn.pfgid >= ZPCI_SIM_GRP_START) {
trace_s390_pci_clp_cap(vpci->vbasedev.name,
VFIO_DEVICE_INFO_CAP_ZPCI_GROUP);
pbdev->zpci_fn.pfgid = ZPCI_DEFAULT_FN_GRP;
@ -165,11 +170,40 @@ static void s390_pci_read_group(S390PCIBusDevice *pbdev,
}
cap = (void *) hdr;
/*
* For an intercept device, let's use an existing simulated group if one
* one was already created for other intercept devices in this group.
* If not, create a new simulated group if any are still available.
* If all else fails, just fall back on the default group.
*/
if (!pbdev->interp) {
pbdev->pci_group = s390_group_find_host_sim(pbdev->zpci_fn.pfgid);
if (pbdev->pci_group) {
/* Use existing simulated group */
pbdev->zpci_fn.pfgid = pbdev->pci_group->id;
return;
} else {
if (s->next_sim_grp == ZPCI_DEFAULT_FN_GRP) {
/* All out of simulated groups, use default */
trace_s390_pci_clp_cap(vpci->vbasedev.name,
VFIO_DEVICE_INFO_CAP_ZPCI_GROUP);
pbdev->zpci_fn.pfgid = ZPCI_DEFAULT_FN_GRP;
pbdev->pci_group = s390_group_find(ZPCI_DEFAULT_FN_GRP);
return;
} else {
/* We can assign a new simulated group */
pbdev->zpci_fn.pfgid = s->next_sim_grp;
s->next_sim_grp++;
/* Fall through to create the new sim group using CLP info */
}
}
}
/* See if the PCI group is already defined, create if not */
pbdev->pci_group = s390_group_find(pbdev->zpci_fn.pfgid);
if (!pbdev->pci_group) {
pbdev->pci_group = s390_group_create(pbdev->zpci_fn.pfgid);
pbdev->pci_group = s390_group_create(pbdev->zpci_fn.pfgid, start_gid);
resgrp = &pbdev->pci_group->zpci_group;
if (cap->flags & VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH) {

6
include/hw/s390x/s390-pci-bus.h
View File

@ -315,13 +315,16 @@ typedef struct ZpciFmb {
QEMU_BUILD_BUG_MSG(offsetof(ZpciFmb, fmt0) != 48, "padding in ZpciFmb");
#define ZPCI_DEFAULT_FN_GRP 0xFF
#define ZPCI_SIM_GRP_START 0xF0
typedef struct S390PCIGroup {
ClpRspQueryPciGrp zpci_group;
int id;
int host_id;
QTAILQ_ENTRY(S390PCIGroup) link;
} S390PCIGroup;
S390PCIGroup *s390_group_create(int id);
S390PCIGroup *s390_group_create(int id, int host_id);
S390PCIGroup *s390_group_find(int id);
S390PCIGroup *s390_group_find_host_sim(int host_id);
struct S390PCIBusDevice {
DeviceState qdev;
@ -370,6 +373,7 @@ struct S390pciState {
QTAILQ_HEAD(, S390PCIBusDevice) zpci_devs;
QTAILQ_HEAD(, S390PCIDMACount) zpci_dma_limit;
QTAILQ_HEAD(, S390PCIGroup) zpci_groups;
uint8_t next_sim_grp;
};
S390pciState *s390_get_phb(void);