The old MSI-X enabling method assume the entries are written before MSI-X
enabled, but some OS didn't obey this, e.g. FreeBSD. This patch would fix
this.
Also, according to the PCI spec, mask bit of MSI-X table should be set
after reset.
Signed-off-by: Sheng Yang <sheng@xxxxxxxxxxxxxxx>
---
hw/device-assignment.c | 188 +++++++++++++++++++++++++++++++++++++++++-------
hw/device-assignment.h | 2 +-
2 files changed, 162 insertions(+), 28 deletions(-)
diff --git a/hw/device-assignment.c b/hw/device-assignment.c
index 832c236..ed0b491 100644
--- a/hw/device-assignment.c
+++ b/hw/device-assignment.c
@@ -1111,15 +1111,12 @@ static void assigned_dev_update_msi(PCIDevice *pci_dev, unsigned int ctrl_pos)
#endif
#ifdef KVM_CAP_DEVICE_MSIX
-static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
+
+#define PCI_MSIX_CTRL_MASKBIT 1ul
+static int get_msix_entries_max_nr(AssignedDevice *adev)
{
- AssignedDevice *adev = container_of(pci_dev, AssignedDevice, dev);
- uint16_t entries_nr = 0, entries_max_nr;
- int pos = 0, i, r = 0;
- uint32_t msg_addr, msg_upper_addr, msg_data, msg_ctrl;
- struct kvm_assigned_msix_nr msix_nr;
- struct kvm_assigned_msix_entry msix_entry;
- void *va = adev->msix_table_page;
+ int pos, entries_max_nr;
+ PCIDevice *pci_dev = &adev->dev;
pos = pci_find_capability(pci_dev, PCI_CAP_ID_MSIX);
@@ -1127,20 +1124,48 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
entries_max_nr &= PCI_MSIX_TABSIZE;
entries_max_nr += 1;
+ return entries_max_nr;
+}
+
+static int assigned_dev_msix_entry_masked(AssignedDevice *adev, int entry)
+{
+ uint32_t msg_ctrl;
+ void *va = adev->msix_table_page;
+
+ memcpy(&msg_ctrl, va + entry * 16 + 12, 4);
+ return (msg_ctrl & PCI_MSIX_CTRL_MASKBIT);
+}
+
+static int get_msix_valid_entries_nr(AssignedDevice *adev,
+ uint16_t entries_max_nr)
+{
+ void *va = adev->msix_table_page;
+ uint32_t msg_ctrl;
+ uint16_t entries_nr = 0;
+ int i;
+
/* Get the usable entry number for allocating */
for (i = 0; i < entries_max_nr; i++) {
memcpy(&msg_ctrl, va + i * 16 + 12, 4);
- memcpy(&msg_data, va + i * 16 + 8, 4);
/* Ignore unused entry even it's unmasked */
- if (msg_data == 0)
+ if (assigned_dev_msix_entry_masked(adev, i))
continue;
entries_nr ++;
}
+ return entries_nr;
+}
+
+static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev,
+ uint16_t entries_nr,
+ uint16_t entries_max_nr)
+{
+ AssignedDevice *adev = container_of(pci_dev, AssignedDevice, dev);
+ int i, r = 0;
+ uint32_t msg_addr, msg_upper_addr, msg_data, msg_ctrl;
+ struct kvm_assigned_msix_nr msix_nr;
+ struct kvm_assigned_msix_entry msix_entry;
+ void *va = adev->msix_table_page;
- if (entries_nr == 0) {
- fprintf(stderr, "MSI-X entry number is zero!\n");
- return -EINVAL;
- }
msix_nr.assigned_dev_id = calc_assigned_dev_id(adev->h_segnr, adev->h_busnr,
(uint8_t)adev->h_devfn);
msix_nr.entry_nr = entries_nr;
@@ -1152,6 +1177,8 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
}
free_dev_irq_entries(adev);
+ memset(pci_dev->msix_entry_used, 0, KVM_MAX_MSIX_PER_DEV *
+ sizeof(*pci_dev->msix_entry_used));
adev->irq_entries_nr = entries_nr;
adev->entry = calloc(entries_nr, sizeof(struct kvm_irq_routing_entry));
if (!adev->entry) {
@@ -1165,10 +1192,10 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
if (entries_nr >= msix_nr.entry_nr)
break;
memcpy(&msg_ctrl, va + i * 16 + 12, 4);
- memcpy(&msg_data, va + i * 16 + 8, 4);
- if (msg_data == 0)
+ if (assigned_dev_msix_entry_masked(adev, i))
continue;
+ memcpy(&msg_data, va + i * 16 + 8, 4);
memcpy(&msg_addr, va + i * 16, 4);
memcpy(&msg_upper_addr, va + i * 16 + 4, 4);
@@ -1182,17 +1209,18 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
adev->entry[entries_nr].u.msi.address_lo = msg_addr;
adev->entry[entries_nr].u.msi.address_hi = msg_upper_addr;
adev->entry[entries_nr].u.msi.data = msg_data;
- DEBUG("MSI-X data 0x%x, MSI-X addr_lo 0x%x\n!", msg_data, msg_addr);
- kvm_add_routing_entry(&adev->entry[entries_nr]);
+ DEBUG("MSI-X data 0x%x, MSI-X addr_lo 0x%x!\n", msg_data, msg_addr);
+ kvm_add_routing_entry(&adev->entry[entries_nr]);
msix_entry.gsi = adev->entry[entries_nr].gsi;
msix_entry.entry = i;
+ pci_dev->msix_entry_used[i] = 1;
r = kvm_assign_set_msix_entry(kvm_context, &msix_entry);
if (r) {
fprintf(stderr, "fail to set MSI-X entry! %s\n", strerror(-r));
break;
}
- DEBUG("MSI-X entry gsi 0x%x, entry %d\n!",
+ DEBUG("MSI-X entry gsi 0x%x, entry %d!\n",
msix_entry.gsi, msix_entry.entry);
entries_nr ++;
}
@@ -1209,20 +1237,24 @@ static void assigned_dev_update_msix(PCIDevice *pci_dev, unsigned int ctrl_pos)
{
struct kvm_assigned_irq assigned_irq_data;
AssignedDevice *assigned_dev = container_of(pci_dev, AssignedDevice, dev);
- uint16_t *ctrl_word = (uint16_t *)(pci_dev->config + ctrl_pos);
+ uint16_t ctrl_word = *(uint16_t *)(pci_dev->config + ctrl_pos);
int r;
+ uint16_t entries_nr, entries_max_nr;
+ int enable_msix;
memset(&assigned_irq_data, 0, sizeof assigned_irq_data);
assigned_irq_data.assigned_dev_id =
calc_assigned_dev_id(assigned_dev->h_segnr, assigned_dev->h_busnr,
(uint8_t)assigned_dev->h_devfn);
+ enable_msix = ((ctrl_word & PCI_MSIX_ENABLE) &&
+ !(ctrl_word & PCI_MSIX_MASK));
+
/* Some guests gratuitously disable MSIX even if they're not using it,
* try to catch this by only deassigning irqs if the guest is using
* MSIX or intends to start. */
if ((assigned_dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MSIX) ||
- (*ctrl_word & PCI_MSIX_ENABLE)) {
-
+ enable_msix) {
assigned_irq_data.flags = assigned_dev->irq_requested_type;
free_dev_irq_entries(assigned_dev);
r = kvm_deassign_irq(kvm_context, &assigned_irq_data);
@@ -1231,16 +1263,30 @@ static void assigned_dev_update_msix(PCIDevice *pci_dev, unsigned int ctrl_pos)
perror("assigned_dev_update_msix: deassign irq");
assigned_dev->irq_requested_type = 0;
+ memset(pci_dev->msix_entry_used, 0, KVM_MAX_MSIX_PER_DEV *
+ sizeof(*pci_dev->msix_entry_used));
}
- if (*ctrl_word & PCI_MSIX_ENABLE) {
- assigned_irq_data.flags = KVM_DEV_IRQ_HOST_MSIX |
- KVM_DEV_IRQ_GUEST_MSIX;
-
- if (assigned_dev_update_msix_mmio(pci_dev) < 0) {
+ entries_max_nr = assigned_dev->max_msix_entries_nr;
+ if (entries_max_nr == 0) {
+ fprintf(stderr, "assigned_dev_update_msix: MSI-X entries_max_nr == 0");
+ return;
+ }
+ /*
+ * Guest may try to enable MSI-X before setting MSI-X entry done, so
+ * let's wait until guest unmask the entries.
+ */
+ entries_nr = get_msix_valid_entries_nr(assigned_dev, entries_max_nr);
+ if (entries_nr == 0)
+ return;
+ if (enable_msix) {
+ if (assigned_dev_update_msix_mmio(pci_dev,
+ entries_nr, entries_max_nr) < 0) {
perror("assigned_dev_update_msix_mmio");
return;
}
+ assigned_irq_data.flags = KVM_DEV_IRQ_HOST_MSIX |
+ KVM_DEV_IRQ_GUEST_MSIX;
if (kvm_assign_irq(kvm_context, &assigned_irq_data) < 0) {
perror("assigned_dev_enable_msix: assign irq");
return;
@@ -1341,6 +1387,7 @@ static int assigned_device_pci_cap_init(PCIDevice *pci_dev)
bar_nr = msix_table_entry & PCI_MSIX_BIR;
msix_table_entry &= ~PCI_MSIX_BIR;
dev->msix_table_addr = pci_region[bar_nr].base_addr + msix_table_entry;
+ dev->max_msix_entries_nr = get_msix_entries_max_nr(dev);
}
#endif
#endif
@@ -1378,10 +1425,90 @@ static void msix_mmio_writel(void *opaque,
AssignedDevice *adev = opaque;
unsigned int offset = addr & 0xfff;
void *page = adev->msix_table_page;
+ int ctrl_word, index;
+ struct kvm_irq_routing_entry new_entry = {};
+ int entry_idx, entries_max_nr, r = 0, i;
+ uint32_t msg_ctrl, msg_data, msg_upper_addr, msg_addr;
+ struct PCIDevice *pci_dev = &adev->dev;
+ uint8_t cap = pci_find_capability(pci_dev, PCI_CAP_ID_MSIX);
DEBUG("write to MSI-X entry table mmio offset 0x%lx, val 0x%x\n",
addr, val);
memcpy((void *)((char *)page + offset), &val, 4);
+
+ index = offset / 16;
+
+ /* Check if mask bit is being accessed */
+ memcpy(&msg_addr, (char *)page + index * 16, 4);
+ memcpy(&msg_upper_addr, (char *)page + index * 16 + 4, 4);
+ memcpy(&msg_data, (char *)page + index * 16 + 8, 4);
+ memcpy(&msg_ctrl, (char *)page + index * 16 + 12, 4);
+ DEBUG("MSI-X entries index %d: "
+ "msg_addr 0x%x, msg_upper_addr 0x%x, msg_data 0x%x, vec_ctl 0x%x\n",
+ index, msg_addr, msg_upper_addr, msg_data, msg_ctrl);
+
+ ctrl_word = pci_get_word(pci_dev->config + cap + PCI_MSIX_FLAGS);
+
+ if (!((ctrl_word & PCI_MSIX_ENABLE) && !(ctrl_word & PCI_MSIX_MASK)))
+ return;
+
+ if (!assigned_dev_msix_entry_masked(adev, index)) {
+ if (!adev->dev.msix_entry_used[index]) {
+ DEBUG("Try to modify unenabled MSI-X entry %d's mask. "
+ "Reenable MSI-X.\n",
+ index);
+ assigned_dev_update_msix(&adev->dev, cap + PCI_MSIX_FLAGS);
+ }
+ return;
+ }
+
+ if (!adev->dev.msix_entry_used[index])
+ return;
+
+ entries_max_nr = adev->max_msix_entries_nr;
+
+ /*
+ * Find the index of routing entry, it can be different from 'index' if
+ * empty entry existed in between
+ */
+ entry_idx = -1;
+ for (i = 0; i <= index; i++) {
+ if (adev->dev.msix_entry_used[i])
+ entry_idx ++;
+ }
+ if (entry_idx >= entries_max_nr || entry_idx == -1) {
+ fprintf(stderr, "msix_mmio_writel: Entry idx %d exceed limit!\n",
+ entry_idx);
+ return;
+ }
+
+ if (!assigned_dev_msix_entry_masked(adev, index)) {
+ fprintf(stderr, "msix_mmio_writel: Trying write to unmasked entry!\n");
+ return;
+ }
+
+ new_entry.gsi = adev->entry[entry_idx].gsi;
+ new_entry.type = KVM_IRQ_ROUTING_MSI;
+ new_entry.flags = 0;
+ new_entry.u.msi.address_lo = msg_addr;
+ new_entry.u.msi.address_hi = msg_upper_addr;
+ new_entry.u.msi.data = msg_data;
+ if (memcmp(&adev->entry[entry_idx].u.msi, &new_entry.u.msi,
+ sizeof new_entry.u.msi)) {
+ r = kvm_update_routing_entry(&adev->entry[entry_idx], &new_entry);
+ if (r) {
+ perror("msix_mmio_writel: kvm_update_routing_entry failed\n");
+ return;
+ }
+ r = kvm_commit_irq_routes();
+ if (r) {
+ perror("msix_mmio_writel: kvm_commit_irq_routes failed\n");
+ return;
+ }
+ }
+ adev->entry[entry_idx].u.msi.address_lo = msg_addr;
+ adev->entry[entry_idx].u.msi.address_hi = msg_upper_addr;
+ adev->entry[entry_idx].u.msi.data = msg_data;
}
static void msix_mmio_writew(void *opaque,
@@ -1408,6 +1535,7 @@ static CPUReadMemoryFunc *msix_mmio_read[] = {
static int assigned_dev_register_msix_mmio(AssignedDevice *dev)
{
+ int i;
dev->msix_table_page = mmap(NULL, 0x1000,
PROT_READ|PROT_WRITE,
MAP_ANONYMOUS|MAP_PRIVATE, 0, 0);
@@ -1417,8 +1545,12 @@ static int assigned_dev_register_msix_mmio(AssignedDevice *dev)
return -EFAULT;
}
memset(dev->msix_table_page, 0, 0x1000);
+ for (i = 0; i < 0x1000; i += 0x10)
+ *(uint32_t *)(dev->msix_table_page + i + 0xc) = 1;
dev->mmio_index = cpu_register_io_memory(
msix_mmio_read, msix_mmio_write, dev);
+ dev->dev.msix_entry_used = qemu_mallocz(KVM_MAX_MSIX_PER_DEV *
+ sizeof *dev->dev.msix_entry_used);
return 0;
}
@@ -1435,6 +1567,8 @@ static void assigned_dev_unregister_msix_mmio(AssignedDevice *dev)
strerror(errno));
}
dev->msix_table_page = NULL;
+ free(dev->dev.msix_entry_used);
+ dev->dev.msix_entry_used = NULL;
}
static const VMStateDescription vmstate_assigned_device = {
diff --git a/hw/device-assignment.h b/hw/device-assignment.h
index c94a730..754e5c0 100644
--- a/hw/device-assignment.h
+++ b/hw/device-assignment.h
@@ -104,7 +104,7 @@ typedef struct AssignedDevice {
#define ASSIGNED_DEVICE_MSIX_MASKED (1 << 2)
uint32_t state;
} cap;
- int irq_entries_nr;
+ int irq_entries_nr, max_msix_entries_nr;
struct kvm_irq_routing_entry *entry;
void *msix_table_page;
target_phys_addr_t msix_table_addr;
--
1.7.0.1
--
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