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Load vfio-pci module when setup sriov #283

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merged 1 commit into from
Jan 3, 2023
Merged

Load vfio-pci module when setup sriov #283

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21 changes: 19 additions & 2 deletions src/guest/vm_builder_qemu.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,8 @@ constexpr const char *kIntelGpuSriovNumVfs = "/sys/bus/pci/devices/0000:00:02.0/
constexpr const char *kVfioPciNewId = "/sys/bus/pci/drivers/vfio-pci/new_id";
constexpr const char *kVfioPciRemoveId = "/sys/bus/pci/drivers/vfio-pci/remove_id";
constexpr const char *kVfioPciUnbind = "/sys/bus/pci/drivers/vfio-pci/unbind";
constexpr const char *kVfioModulePath = "/sys/module/vfio/";
constexpr const char *kVfioPciModulePath = "/sys/module/vfio_pci/";

constexpr const char *kGvtgMdevTypePath = "/sys/bus/pci/devices/0000:00:02.0/mdev_supported_types/";
constexpr const char *kGvtgMdevV51Path = "/sys/bus/pci/devices/0000:00:02.0/mdev_supported_types/i915-GVTg_V5_1/";
Expand Down Expand Up @@ -203,7 +205,22 @@ static bool SetupHugePages(const std::string &mem_size) {
return true;
}

static bool LoadKernelModule(const char *path, const std::string &module) {
boost::filesystem::path p(path);
if (!boost::filesystem::exists(p)) {
if (boost::process::system("modprobe " + module))
return false;
}
return true;
}

static int SetAvailableVf(void) {
if (!LoadKernelModule(kVfioModulePath,"vfio"))
return -1;

if (!LoadKernelModule(kVfioPciModulePath,"vfio-pci"))
return -1;

int totalvfs = ReadSysFile(kIntelGpuSriovTotalVfs, std::ios_base::dec);
if (totalvfs <= 0)
return -1;
Expand Down Expand Up @@ -310,10 +327,10 @@ static bool PassthroughOnePciDev(const char *pci_id, PciPassthroughAction action
if (!pci_id)
return false;

if (boost::process::system("modprobe vfio"))
if (!LoadKernelModule(kVfioModulePath,"vfio"))
return false;

if (boost::process::system("modprobe vfio-pci"))
if (!LoadKernelModule(kVfioPciModulePath,"vfio-pci"))
return false;

boost::filesystem::path p(kPciDevicePath);
Expand Down