On 2018-01-12 01:22, Gustavo Lima Chaves wrote: > Before Jailhouse claims devices, disable AER reporting altogether on > them, because otherwise they could hit their root complexes, which would > be in the root cell. When the hypervisor is disabled, turn back whatever > values where on those previous configurations. > > Signed-off-by: Gustavo Lima Chaves <gustavo.lima.cha...@intel.com> > --- > hypervisor/include/jailhouse/pci.h | 15 +++++++++ > hypervisor/pci.c | 63 > +++++++++++++++++++++++++++++++++++++- > 2 files changed, 77 insertions(+), 1 deletion(-) > > diff --git a/hypervisor/include/jailhouse/pci.h > b/hypervisor/include/jailhouse/pci.h > index 720ecacd..6d256613 100644 > --- a/hypervisor/include/jailhouse/pci.h > +++ b/hypervisor/include/jailhouse/pci.h > @@ -39,6 +39,17 @@ > #define PCI_CAP_MSIX 0x11 > #define PCI_CAP_EXPRESS 0x10 > > +#define PCI_CAP_PCIE (0x10 | JAILHOUSE_PCI_EXT_CAP)
I would OR the Jailhouse flag in on use and define PCI_CAP_PCIE purely according to the spec here. > +#define PCIE_CONTROL_REG 0x08 > + > +#define PCIE_AER_FLAGS (PCIE_DEVCTL_CERE | PCIE_DEVCTL_NFERE | \ > + PCIE_DEVCTL_FERE | PCIE_DEVCTL_URRE) That list could also be build on use, specifically as PCIE_AER_FLAGS is not telling the purpose of the list. > + > +#define PCIE_DEVCTL_CERE 0x0001 /* Correctable Error Reporting En. */ > +#define PCIE_DEVCTL_NFERE 0x0002 /* Non-Fatal Error Reporting Enable */ > +#define PCIE_DEVCTL_FERE 0x0004 /* Fatal Error Reporting Enable */ > +#define PCIE_DEVCTL_URRE 0x0008 /* Unsupported Request Reporting En. */ > + > #define PCI_IVSHMEM_NUM_MMIO_REGIONS 2 > > struct cell; > @@ -131,6 +142,10 @@ struct pci_device { > /** Shadow BAR */ > u32 bar[PCI_NUM_BARS]; > > + /** Shadow state of Device Control Register. */ > + u16 dev_ctrl_reg; > + bool aer_override; > + > /** Shadow state of MSI config space registers. */ > union pci_msi_registers msi_registers; > > diff --git a/hypervisor/pci.c b/hypervisor/pci.c > index 39f36f5f..30b733c9 100644 > --- a/hypervisor/pci.c > +++ b/hypervisor/pci.c > @@ -537,6 +537,64 @@ static void pci_restore_msix(struct pci_device *device, > pci_suppress_msix(device, cap, false); > } > > +static void pci_suppress_aer(struct pci_device *device) > +{ > + const struct jailhouse_pci_capability *cap; > + u16 bdf = device->info->bdf; > + bool found = false; > + u16 dev_ctrl_reg; > + unsigned int n; > + > + if (device->info->type == JAILHOUSE_PCI_TYPE_IVSHMEM) > + return; Not needed because we do not call this function for physical devices. > + > + for_each_pci_cap(cap, device, n) > + if (cap->id != PCI_CAP_EXPRESS) > + continue; > + else { if () { } else { > + found = true; > + break; > + } > + > + if (!found) > + return; We can probably extract some pci_get_cap(device, cap_id) that returns a cap pointer of NULL. Would simplify the code here and avoid the duplication in pci_restore_aer. > + > + device->dev_ctrl_reg = pci_read_config(bdf, cap->start + > + PCIE_CONTROL_REG, > + sizeof(device->dev_ctrl_reg)); > + dev_ctrl_reg = device->dev_ctrl_reg; Style nit: dev_ctrl_reg = pci_read_config(bdf, cap->start + PCIE_CONTROL_REG, sizeof(device->dev_ctrl_reg)); device->dev_ctrl_reg = dev_ctrl_reg; > + dev_ctrl_reg &= ~PCIE_AER_FLAGS; > + device->aer_override = true; > + > + pci_write_config(bdf, cap->start + PCIE_CONTROL_REG, dev_ctrl_reg, > + sizeof(dev_ctrl_reg)); > +} > + > +static void pci_restore_aer(struct pci_device *device) > +{ > + const struct jailhouse_pci_capability *cap; > + bool found = false; > + unsigned int n; > + > + if (!device->aer_override || > + device->info->type == JAILHOUSE_PCI_TYPE_IVSHMEM) aer_override will not be set for IVSHMEM devices, so testing for it alone is enough. > + return; > + > + for_each_pci_cap(cap, device, n) > + if (cap->id != PCI_CAP_EXPRESS) > + continue; > + else { > + found = true; > + break; > + } > + > + if (!found) > + return; > + > + pci_write_config(device->info->bdf, cap->start + PCIE_CONTROL_REG, > + device->dev_ctrl_reg, sizeof(device->dev_ctrl_reg)); > +} > + > /** > * Prepare the handover of PCI devices to Jailhouse or back to Linux. > */ > @@ -725,8 +783,10 @@ int pci_cell_init(struct cell *cell) > > root_device = pci_get_assigned_device(&root_cell, > dev_infos[ndev].bdf); > - if (root_device) > + if (root_device) { > + pci_suppress_aer(root_device); > pci_remove_physical_device(root_device); > + } > > err = pci_add_physical_device(cell, device); > if (err) > @@ -799,6 +859,7 @@ void pci_cell_exit(struct cell *cell) > pci_remove_physical_device(device); > pci_return_device_to_root_cell(device); > } > + pci_restore_aer(device); Shouldn't that be move into the block above? > } > > page_free(&mem_pool, cell->pci_devices, devlist_pages); > Jan -- Siemens AG, Corporate Technology, CT RDA IOT SES-DE Corporate Competence Center Embedded Linux -- You received this message because you are subscribed to the Google Groups "Jailhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to jailhouse-dev+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.