0255e62798
After enabling vPCI in hypervisor for vm0, UOS may not able be launched successfully. Consider this scenario (take MSI-X for example): - DM makes hypercall to hypervisor to do MSI-X remapping on behalf of UOS guests. - After the hypercall, VHM module in SOS kernel updates the physical MSI-X table with the physical Message Data/Addr. - These MMIO write requests are intercepted by hypervisor, which will call ptdev_msix_remap() to do MSI-S remapping. It may fail due to 2 possible reasons: 1) wrong target VM because: hypervisor thinks it's a VM0 MSI-X device but they have been registered as UOS guests through HC_SET_PTDEV_INTR_INFO hypercall. 2) wrong ptdev_msi_info->vmsi_data because: The virtual MSI-X table is supposed to hold virtual Message data/addr but the SOS VHM writes the physical ones to it. This patch resolves these problems by ignoring the HC_VM_PCI_MSIX_REMAP hypercall, so virtual and physical Message Data are the same from SOS' perspective and it won't mess up the virtual PCI device in HV. Also in HC_SET_PTDEV_INTR_INFO handler, vpci updates the target VM when the PCI devices are assigned to different VMs. The UOS' MSI/MSI-X remapping is triggered by hypervisor when SOS (either DM or VHM) updates the Message Data/Addr. Tracked-On: #1568 Signed-off-by: dongshen <dongsheng.x.zhang@intel.com> Signed-off-by: Zide Chen <zide.chen@intel.com> Acked-by: Anthony Xu <anthony.xu@intel.com> |
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| .. | ||
| pci.h | ||
| vpci.h | ||