First of all, vtd_setup_msi() is provided. It setup IRTE entries,
meanwhile, setup PCI device MSI vectors corresponding to VT-d spec.
Meanwhile, IR MSI test is added to intel IOMMU unit test. The basic IR
test is carried out by a edu INTR raise request. When write to the intr
raise register, interrupt will be generated. Type of interrupt will
depend on the setup (either INTx or MSI).
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
lib/pci-edu.h | 1 +
lib/x86/intel-iommu.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++
lib/x86/intel-iommu.h | 1 +
x86/intel-iommu.c | 44 +++++++++++++++++++++++-
4 files changed, 139 insertions(+), 1 deletion(-)
diff --git a/lib/pci-edu.h b/lib/pci-edu.h
index f931845..283501c 100644
--- a/lib/pci-edu.h
+++ b/lib/pci-edu.h
@@ -32,6 +32,7 @@
#define EDU_REG_ALIVE 0x4
#define EDU_REG_FACTORIAL 0x8
#define EDU_REG_STATUS 0x20
+#define EDU_REG_INTR_RAISE 0x60
#define EDU_REG_DMA_SRC 0x80
#define EDU_REG_DMA_DST 0x88
#define EDU_REG_DMA_COUNT 0x90
diff --git a/lib/x86/intel-iommu.c b/lib/x86/intel-iommu.c
index 48fb2a7..54de43e 100644
--- a/lib/x86/intel-iommu.c
+++ b/lib/x86/intel-iommu.c
@@ -12,6 +12,7 @@
#include "intel-iommu.h"
#include "libcflat.h"
+#include "pci.h"
/*
* VT-d in QEMU currently only support 39 bits address width, which is
@@ -48,6 +49,26 @@ struct vtd_context_entry {
} __attribute__ ((packed));
typedef struct vtd_context_entry vtd_ce_t;
+struct vtd_irte {
+ uint32_t present:1;
+ uint32_t fault_disable:1; /* Fault Processing Disable */
+ uint32_t dest_mode:1; /* Destination Mode */
+ uint32_t redir_hint:1; /* Redirection Hint */
+ uint32_t trigger_mode:1; /* Trigger Mode */
+ uint32_t delivery_mode:3; /* Delivery Mode */
+ uint32_t __avail:4; /* Available spaces for software */
+ uint32_t __reserved_0:3; /* Reserved 0 */
+ uint32_t irte_mode:1; /* IRTE Mode */
+ uint32_t vector:8; /* Interrupt Vector */
+ uint32_t __reserved_1:8; /* Reserved 1 */
+ uint32_t dest_id; /* Destination ID */
+ uint16_t source_id:16; /* Source-ID */
+ uint64_t sid_q:2; /* Source-ID Qualifier */
+ uint64_t sid_vtype:2; /* Source-ID Validation Type */
+ uint64_t __reserved_2:44; /* Reserved 2 */
+} __attribute__ ((packed));
+typedef struct vtd_irte vtd_irte_t;
+
#define VTD_RTA_MASK (PAGE_MASK)
#define VTD_IRTA_MASK (PAGE_MASK)
@@ -206,6 +227,79 @@ void vtd_map_range(uint16_t sid, iova_t iova, phys_addr_t pa, size_t size)
}
}
+static uint16_t vtd_intr_index_alloc(void)
+{
+ static int index_ctr = 0;
+ assert(index_ctr < 65535);
+ return index_ctr++;
+}
+
+static void vtd_setup_irte(struct pci_dev *dev, vtd_irte_t *irte,
+ int vector, int dest_id)
+{
+ assert(sizeof(vtd_irte_t) == 16);
+ memset(irte, 0, sizeof(*irte));
+ irte->fault_disable = 1;
+ irte->dest_mode = 0; /* physical */
+ irte->trigger_mode = 0; /* edge */
+ irte->delivery_mode = 0; /* fixed */
+ irte->irte_mode = 0; /* remapped */
+ irte->vector = vector;
+ irte->dest_id = dest_id;
+ irte->source_id = dev->bdf;
+ irte->sid_q = 0;
+ irte->sid_vtype = 1; /* full-sid verify */
+ irte->present = 1;
+}
+
+struct vtd_msi_addr {
+ uint32_t __dont_care:2;
+ uint32_t handle_15:1; /* handle[15] */
+ uint32_t shv:1;
+ uint32_t interrupt_format:1;
+ uint32_t handle_0_14:15; /* handle[0:14] */
+ uint32_t head:12; /* 0xfee */
+ uint32_t addr_hi; /* not used except with x2apic */
+} __attribute__ ((packed));
+typedef struct vtd_msi_addr vtd_msi_addr_t;
+
+struct vtd_msi_data {
+ uint16_t __reserved;
+ uint16_t subhandle;
+} __attribute__ ((packed));
+typedef struct vtd_msi_data vtd_msi_data_t;
+
+/**
+ * vtd_setup_msi - setup MSI message for a device
+ *
+ * @dev: PCI device to setup MSI
+ * @vector: interrupt vector
+ * @dest_id: destination processor
+ */
+bool vtd_setup_msi(struct pci_dev *dev, int vector, int dest_id)
+{
+ vtd_msi_data_t msi_data = {};
+ vtd_msi_addr_t msi_addr = {};
+ vtd_irte_t *irte = phys_to_virt(vtd_ir_table());
+ uint16_t index = vtd_intr_index_alloc();
+
+ assert(sizeof(vtd_msi_addr_t) == 8);
+ assert(sizeof(vtd_msi_data_t) == 4);
+
+ printf("INTR: setup IRTE index %d\n", index);
+ vtd_setup_irte(dev, irte + index, vector, dest_id);
+
+ msi_addr.handle_15 = index >> 15 & 1;
+ msi_addr.shv = 0;
+ msi_addr.interrupt_format = 1;
+ msi_addr.handle_0_14 = index & 0x7fff;
+ msi_addr.head = 0xfee;
+ msi_data.subhandle = 0;
+
+ return pci_setup_msi(dev, *(uint64_t *)&msi_addr,
+ *(uint32_t *)&msi_data);
+}
+
void vtd_init(void)
{
setup_vm();
diff --git a/lib/x86/intel-iommu.h b/lib/x86/intel-iommu.h
index 1352639..13feafa 100644
--- a/lib/x86/intel-iommu.h
+++ b/lib/x86/intel-iommu.h
@@ -137,5 +137,6 @@ static inline uint64_t vtd_readq(unsigned int reg)
void vtd_init(void);
void vtd_map_range(uint16_t sid, phys_addr_t iova, phys_addr_t pa, size_t size);
+bool vtd_setup_msi(struct pci_dev *dev, int vector, int dest_id);
#endif
diff --git a/x86/intel-iommu.c b/x86/intel-iommu.c
index 21fd57f..753f90e 100644
--- a/x86/intel-iommu.c
+++ b/x86/intel-iommu.c
@@ -12,8 +12,10 @@
#include "intel-iommu.h"
#include "pci-edu.h"
+#include "x86/apic.h"
#define VTD_TEST_DMAR_4B ("DMAR 4B memcpy test")
+#define VTD_TEST_IR_MSI ("IR MSI")
void vtd_test_dmar(struct pci_edu_dev *dev)
{
@@ -51,6 +53,43 @@ void vtd_test_dmar(struct pci_edu_dev *dev)
free_page(page);
}
+static volatile bool edu_intr_recved;
+
+static void edu_isr(isr_regs_t *regs)
+{
+ edu_intr_recved = true;
+ eoi();
+}
+
+static void vtd_test_ir(struct pci_edu_dev *dev)
+{
+#define VTD_TEST_VECTOR (0xee)
+ /*
+ * Setup EDU PCI device MSI, using interrupt remapping. By
+ * default, EDU device is using INTx.
+ */
+ if (!vtd_setup_msi(&dev->pci_dev, VTD_TEST_VECTOR, 0)) {
+ printf("edu device does not support MSI, skip test\n");
+ report_skip(VTD_TEST_IR_MSI);
+ return;
+ }
+
+ handle_irq(VTD_TEST_VECTOR, edu_isr);
+ irq_enable();
+
+ /* Manually trigger INTR */
+ edu_reg_writel(dev, EDU_REG_INTR_RAISE, 1);
+
+ while (!edu_intr_recved)
+ cpu_relax();
+
+ /* Clear INTR bits */
+ edu_reg_writel(dev, EDU_REG_INTR_RAISE, 0);
+
+ /* We are good as long as we reach here */
+ report(VTD_TEST_IR_MSI, true);
+}
+
int main(int argc, char *argv[])
{
struct pci_edu_dev dev;
@@ -71,8 +110,11 @@ int main(int argc, char *argv[])
printf("Please specify \"-device edu\" to do "
"further IOMMU tests.\n");
report_skip(VTD_TEST_DMAR_4B);
- } else
+ report_skip(VTD_TEST_IR_MSI);
+ } else {
vtd_test_dmar(&dev);
+ vtd_test_ir(&dev);
+ }
return report_summary();
}
--
2.7.4
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
