diff options
Diffstat (limited to 'system/xen/xsa/xsa337-4.13-1.patch')
| -rw-r--r-- | system/xen/xsa/xsa337-4.13-1.patch | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/system/xen/xsa/xsa337-4.13-1.patch b/system/xen/xsa/xsa337-4.13-1.patch new file mode 100644 index 0000000000..2091626f4f --- /dev/null +++ b/system/xen/xsa/xsa337-4.13-1.patch @@ -0,0 +1,87 @@ +From: Roger Pau Monné <roger.pau@citrix.com> +Subject: x86/msi: get rid of read_msi_msg + +It's safer and faster to just use the cached last written +(untranslated) MSI message stored in msi_desc for the single user that +calls read_msi_msg. + +This also prevents relying on the data read from the device MSI +registers in order to figure out the index into the IOMMU interrupt +remapping table, which is not safe. + +This is part of XSA-337. + +Reported-by: Andrew Cooper <andrew.cooper3@citrix.com> +Requested-by: Andrew Cooper <andrew.cooper3@citrix.com> +Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> +Reviewed-by: Jan Beulich <jbeulich@suse.com> + +--- a/xen/arch/x86/msi.c ++++ b/xen/arch/x86/msi.c +@@ -183,54 +183,6 @@ void msi_compose_msg(unsigned vector, co + MSI_DATA_VECTOR(vector); + } + +-static bool read_msi_msg(struct msi_desc *entry, struct msi_msg *msg) +-{ +- switch ( entry->msi_attrib.type ) +- { +- case PCI_CAP_ID_MSI: +- { +- struct pci_dev *dev = entry->dev; +- int pos = entry->msi_attrib.pos; +- uint16_t data; +- +- msg->address_lo = pci_conf_read32(dev->sbdf, +- msi_lower_address_reg(pos)); +- if ( entry->msi_attrib.is_64 ) +- { +- msg->address_hi = pci_conf_read32(dev->sbdf, +- msi_upper_address_reg(pos)); +- data = pci_conf_read16(dev->sbdf, msi_data_reg(pos, 1)); +- } +- else +- { +- msg->address_hi = 0; +- data = pci_conf_read16(dev->sbdf, msi_data_reg(pos, 0)); +- } +- msg->data = data; +- break; +- } +- case PCI_CAP_ID_MSIX: +- { +- void __iomem *base = entry->mask_base; +- +- if ( unlikely(!msix_memory_decoded(entry->dev, +- entry->msi_attrib.pos)) ) +- return false; +- msg->address_lo = readl(base + PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET); +- msg->address_hi = readl(base + PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET); +- msg->data = readl(base + PCI_MSIX_ENTRY_DATA_OFFSET); +- break; +- } +- default: +- BUG(); +- } +- +- if ( iommu_intremap ) +- iommu_read_msi_from_ire(entry, msg); +- +- return true; +-} +- + static int write_msi_msg(struct msi_desc *entry, struct msi_msg *msg) + { + entry->msg = *msg; +@@ -302,10 +254,7 @@ void set_msi_affinity(struct irq_desc *d + + ASSERT(spin_is_locked(&desc->lock)); + +- memset(&msg, 0, sizeof(msg)); +- if ( !read_msi_msg(msi_desc, &msg) ) +- return; +- ++ msg = msi_desc->msg; + msg.data &= ~MSI_DATA_VECTOR_MASK; + msg.data |= MSI_DATA_VECTOR(desc->arch.vector); + msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK; |