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hv: vpci: restore PCI BARs when doing PCIe FLR

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ACRN hypervisor should trap guest doing PCIe FLR. Besides, it should save some status
before doing the FLR and restore them later, only BARs values for now.
This patch will trap guest Device Capabilities Register write operation if the device
supports PCI Express Capability and check whether it wants to do device FLR. If it does,
call pdev_do_flr to do the job.

Tracked-On: #3465
Signed-off-by: Li Fei1 <fei1.li@intel.com>
This commit is contained in:
Li Fei1
2019-12-19 18:51:19 +08:00
committed by wenlingz
parent 3c2f4509af
commit a90e0f6c84
7 changed files with 77 additions and 3 deletions
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3
hypervisor/dm/vpci/pci_pt.c
View File

@@ -233,6 +233,9 @@ void init_vdev_pt(struct pci_vdev *vdev)
vdev->nr_bars = vdev->pdev->nr_bars;
pbdf.value = vdev->pdev->bdf.value;
vdev->has_flr = vdev->pdev->has_flr;
vdev->pcie_capoff = vdev->pdev->pcie_capoff;
for (idx = 0U; idx < vdev->nr_bars; idx++) {
vbar = &vdev->bar[idx];
offset = pci_bar_offset(idx);

4
hypervisor/dm/vpci/vpci.c
View File

@@ -337,6 +337,10 @@ static int32_t vpci_write_pt_dev_cfg(struct pci_vdev *vdev, uint32_t offset,
vmsi_write_cfg(vdev, offset, bytes, val);
} else if (msixcap_access(vdev, offset)) {
vmsix_write_cfg(vdev, offset, bytes, val);
} else if (vdev->has_flr && ((vdev->pcie_capoff + PCIR_PCIE_DEVCTRL) == offset) &&
((val & PCIM_PCIE_FLR) != 0U)) {
/* Assume that guest write FLR must be 4 bytes aligned */
pdev_do_flr(vdev->pdev->bdf, offset, bytes, val);
} else {
/* passthru to physical device */
pci_pdev_write_cfg(vdev->pdev->bdf, offset, bytes, val);