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dm: passthru: add support to allocate a bar for vmsix on msi emulation

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New option "vmsix_on_msi,<bar_id>" is added to specify the passthrough
device needs vMSI-X emulation based on MSI capability.
If vMSI-X on MSI emulation is needed, a virtual BAR will be allocated.

Also, fix a logic error on when to setup INTx.

Tracked-On: #4831
Signed-off-by: Binbin Wu <binbin.wu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Binbin Wu 2020-05-13 15:02:48 +00:00 committed by wenlingz
parent 68b5616a52
commit 417ce1b32d
1 changed files with 32 additions and 1 deletions
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33
devicemodel/hw/pci/passthrough.c
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@ -467,6 +467,22 @@ passthru_gpu_dsm_opregion(struct vmctx *ctx, struct passthru_dev *ptdev,
pcidev->type = QUIRK_PTDEV;
}
static int
parse_vmsix_on_msi_bar_id(char *s, int *id, int base)
{
char *str, *cp;
int ret = 0;
if (s == NULL)
return -EINVAL;
str = cp = strdup(s);
ret = dm_strtoi(cp, &cp, base, id);
free(str);
return ret;
}
/*
* Passthrough device initialization function:
* - initialize virtual config space
@ -488,6 +504,7 @@ passthru_init(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
char *opt;
bool keep_gsi = false;
bool need_reset = true;
int vmsix_on_msi_bar_id = -1;
struct acrn_assign_pcidev pcidev = {};
uint16_t vendor = 0, device = 0;
@ -519,6 +536,13 @@ passthru_init(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
/* Create the dedicated "igd-lpc" on 00:1f.0 for IGD passthrough */
if (pci_parse_slot("31,igd-lpc") != 0)
warnx("faild to create igd-lpc");
} else if (!strncmp(opt, "vmsix_on_msi", 12)) {
opt = strsep(&opts, ",");
if (parse_vmsix_on_msi_bar_id(opt, &vmsix_on_msi_bar_id, 10) != 0) {
warnx("faild to parse msix emulation bar id");
return -EINVAL;
}
} else
warnx("Invalid passthru options:%s", opt);
}
@ -589,6 +613,13 @@ passthru_init(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
if (error < 0)
goto done;
if (vmsix_on_msi_bar_id != -1) {
error = pci_emul_alloc_pbar(dev, vmsix_on_msi_bar_id, 0, PCIBAR_MEM32, 4096);
if (error < 0)
goto done;
error = IRQ_MSI;
}
if (ptdev->phys_bdf == PCI_BDF_GPU)
passthru_gpu_dsm_opregion(ctx, ptdev, &pcidev, device);
@ -602,7 +633,7 @@ passthru_init(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
* Forge Guest to use MSI/MSIX in this case to mitigate IRQ sharing
* issue
*/
if (error != IRQ_MSI && !keep_gsi) {
if (error != IRQ_MSI || keep_gsi) {
/* Allocates the virq if ptdev only support INTx */
pci_lintr_request(dev);