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authorLinus Torvalds <torvalds@linux-foundation.org>2016-05-25 09:47:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-25 09:47:26 -0700
commit48dd7cefa010b704eb2532a2883798fd6d703a0e (patch)
treeb225984502abd725a292122d1209e716894fafe4
parentb462b37b08be1b6a4e380d78b978ec1ff84e2783 (diff)
parentf70552809419cd2abc0cc6469a07c9792a3aaa6c (diff)
downloadlinux-48dd7cefa010b704eb2532a2883798fd6d703a0e.tar.gz
Merge tag 'vfio-v4.7-rc1' of git://github.com/awilliam/linux-vfio
Pull VFIO updates from Alex Williamson: - Hide INTx on certain known broken devices (Alex Williamson) - Additional backdoor reset detection (Alex Williamson) - Remove unused iommudata reference (Alexey Kardashevskiy) - Use cfg_size to avoid probing extended config space (Alexey Kardashevskiy) * tag 'vfio-v4.7-rc1' of git://github.com/awilliam/linux-vfio: vfio_pci: Test for extended capabilities if config space > 256 bytes vfio_iommu_spapr_tce: Remove unneeded iommu_group_get_iommudata vfio/pci: Add test for BAR restore vfio/pci: Hide broken INTx support from user
-rw-r--r--drivers/vfio/pci/vfio_pci.c55
-rw-r--r--drivers/vfio/pci/vfio_pci_config.c46
-rw-r--r--drivers/vfio/pci/vfio_pci_private.h1
-rw-r--r--drivers/vfio/vfio_iommu_spapr_tce.c2
4 files changed, 84 insertions, 20 deletions
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 712a84978e97..188b1ff03f5f 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -113,6 +113,35 @@ static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev);
static void vfio_pci_disable(struct vfio_pci_device *vdev);
+/*
+ * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND
+ * _and_ the ability detect when the device is asserting INTx via PCI_STATUS.
+ * If a device implements the former but not the latter we would typically
+ * expect broken_intx_masking be set and require an exclusive interrupt.
+ * However since we do have control of the device's ability to assert INTx,
+ * we can instead pretend that the device does not implement INTx, virtualizing
+ * the pin register to report zero and maintaining DisINTx set on the host.
+ */
+static bool vfio_pci_nointx(struct pci_dev *pdev)
+{
+ switch (pdev->vendor) {
+ case PCI_VENDOR_ID_INTEL:
+ switch (pdev->device) {
+ /* All i40e (XL710/X710) 10/20/40GbE NICs */
+ case 0x1572:
+ case 0x1574:
+ case 0x1580 ... 0x1581:
+ case 0x1583 ... 0x1589:
+ case 0x37d0 ... 0x37d2:
+ return true;
+ default:
+ return false;
+ }
+ }
+
+ return false;
+}
+
static int vfio_pci_enable(struct vfio_pci_device *vdev)
{
struct pci_dev *pdev = vdev->pdev;
@@ -136,23 +165,29 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev)
pr_debug("%s: Couldn't store %s saved state\n",
__func__, dev_name(&pdev->dev));
- ret = vfio_config_init(vdev);
- if (ret) {
- kfree(vdev->pci_saved_state);
- vdev->pci_saved_state = NULL;
- pci_disable_device(pdev);
- return ret;
+ if (likely(!nointxmask)) {
+ if (vfio_pci_nointx(pdev)) {
+ dev_info(&pdev->dev, "Masking broken INTx support\n");
+ vdev->nointx = true;
+ pci_intx(pdev, 0);
+ } else
+ vdev->pci_2_3 = pci_intx_mask_supported(pdev);
}
- if (likely(!nointxmask))
- vdev->pci_2_3 = pci_intx_mask_supported(pdev);
-
pci_read_config_word(pdev, PCI_COMMAND, &cmd);
if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
cmd &= ~PCI_COMMAND_INTX_DISABLE;
pci_write_config_word(pdev, PCI_COMMAND, cmd);
}
+ ret = vfio_config_init(vdev);
+ if (ret) {
+ kfree(vdev->pci_saved_state);
+ vdev->pci_saved_state = NULL;
+ pci_disable_device(pdev);
+ return ret;
+ }
+
msix_pos = pdev->msix_cap;
if (msix_pos) {
u16 flags;
@@ -304,7 +339,7 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
u8 pin;
pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
- if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && pin)
+ if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && !vdev->nointx && pin)
return 1;
} else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index 142c533efec7..93601407dab8 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -408,6 +408,7 @@ static void vfio_bar_restore(struct vfio_pci_device *vdev)
{
struct pci_dev *pdev = vdev->pdev;
u32 *rbar = vdev->rbar;
+ u16 cmd;
int i;
if (pdev->is_virtfn)
@@ -420,6 +421,12 @@ static void vfio_bar_restore(struct vfio_pci_device *vdev)
pci_user_write_config_dword(pdev, i, *rbar);
pci_user_write_config_dword(pdev, PCI_ROM_ADDRESS, *rbar);
+
+ if (vdev->nointx) {
+ pci_user_read_config_word(pdev, PCI_COMMAND, &cmd);
+ cmd |= PCI_COMMAND_INTX_DISABLE;
+ pci_user_write_config_word(pdev, PCI_COMMAND, cmd);
+ }
}
static __le32 vfio_generate_bar_flags(struct pci_dev *pdev, int bar)
@@ -515,6 +522,23 @@ static int vfio_basic_config_read(struct vfio_pci_device *vdev, int pos,
return count;
}
+/* Test whether BARs match the value we think they should contain */
+static bool vfio_need_bar_restore(struct vfio_pci_device *vdev)
+{
+ int i = 0, pos = PCI_BASE_ADDRESS_0, ret;
+ u32 bar;
+
+ for (; pos <= PCI_BASE_ADDRESS_5; i++, pos += 4) {
+ if (vdev->rbar[i]) {
+ ret = pci_user_read_config_dword(vdev->pdev, pos, &bar);
+ if (ret || vdev->rbar[i] != bar)
+ return true;
+ }
+ }
+
+ return false;
+}
+
static int vfio_basic_config_write(struct vfio_pci_device *vdev, int pos,
int count, struct perm_bits *perm,
int offset, __le32 val)
@@ -553,7 +577,8 @@ static int vfio_basic_config_write(struct vfio_pci_device *vdev, int pos,
* SR-IOV devices will trigger this, but we catch them later
*/
if ((new_mem && virt_mem && !phys_mem) ||
- (new_io && virt_io && !phys_io))
+ (new_io && virt_io && !phys_io) ||
+ vfio_need_bar_restore(vdev))
vfio_bar_restore(vdev);
}
@@ -1124,9 +1149,12 @@ static int vfio_cap_len(struct vfio_pci_device *vdev, u8 cap, u8 pos)
return pcibios_err_to_errno(ret);
if (PCI_X_CMD_VERSION(word)) {
- /* Test for extended capabilities */
- pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &dword);
- vdev->extended_caps = (dword != 0);
+ if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) {
+ /* Test for extended capabilities */
+ pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE,
+ &dword);
+ vdev->extended_caps = (dword != 0);
+ }
return PCI_CAP_PCIX_SIZEOF_V2;
} else
return PCI_CAP_PCIX_SIZEOF_V0;
@@ -1138,9 +1166,11 @@ static int vfio_cap_len(struct vfio_pci_device *vdev, u8 cap, u8 pos)
return byte;
case PCI_CAP_ID_EXP:
- /* Test for extended capabilities */
- pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &dword);
- vdev->extended_caps = (dword != 0);
+ if (pdev->cfg_size > PCI_CFG_SPACE_SIZE) {
+ /* Test for extended capabilities */
+ pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &dword);
+ vdev->extended_caps = (dword != 0);
+ }
/* length based on version */
if ((pcie_caps_reg(pdev) & PCI_EXP_FLAGS_VERS) == 1)
@@ -1545,7 +1575,7 @@ int vfio_config_init(struct vfio_pci_device *vdev)
*(__le16 *)&vconfig[PCI_DEVICE_ID] = cpu_to_le16(pdev->device);
}
- if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX))
+ if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) || vdev->nointx)
vconfig[PCI_INTERRUPT_PIN] = 0;
ret = vfio_cap_init(vdev);
diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
index 8a7d546d18a0..016c14a1b454 100644
--- a/drivers/vfio/pci/vfio_pci_private.h
+++ b/drivers/vfio/pci/vfio_pci_private.h
@@ -83,6 +83,7 @@ struct vfio_pci_device {
bool bardirty;
bool has_vga;
bool needs_reset;
+ bool nointx;
struct pci_saved_state *pci_saved_state;
int refcnt;
struct eventfd_ctx *err_trigger;
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index 3054e3fa63ac..80378ddadc5c 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -331,14 +331,12 @@ static void tce_iommu_free_table(struct iommu_table *tbl);
static void tce_iommu_release(void *iommu_data)
{
struct tce_container *container = iommu_data;
- struct iommu_table_group *table_group;
struct tce_iommu_group *tcegrp;
long i;
while (tce_groups_attached(container)) {
tcegrp = list_first_entry(&container->group_list,
struct tce_iommu_group, next);
- table_group = iommu_group_get_iommudata(tcegrp->grp);
tce_iommu_detach_group(iommu_data, tcegrp->grp);
}