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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH V13 9/9] Introduce Xen PCI Passthrough, MSI (3/3)
From: Jiang Yunhong <yunhong.jiang@xxxxxxxxx>
A more complete history can be found here:
git://xenbits.xensource.com/qemu-xen-unstable.git
Signed-off-by: Jiang Yunhong <yunhong.jiang@xxxxxxxxx>
Signed-off-by: Shan Haitao <haitao.shan@xxxxxxxxx>
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
hw/i386/Makefile.objs | 2 +-
hw/xen_pt.c | 31 +++-
hw/xen_pt.h | 51 ++++
hw/xen_pt_config_init.c | 471 +++++++++++++++++++++++++++++++++++
hw/xen_pt_msi.c | 620 +++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 1173 insertions(+), 2 deletions(-)
create mode 100644 hw/xen_pt_msi.c
diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs
index e361a92..d364c37 100644
--- a/hw/i386/Makefile.objs
+++ b/hw/i386/Makefile.objs
@@ -8,7 +8,7 @@ obj-y += pc_piix.o
obj-y += pc_sysfw.o
obj-$(CONFIG_XEN) += xen_platform.o xen_apic.o
obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
-obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o
+obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_msi.o
obj-$(CONFIG_KVM) += kvm/clock.o kvm/apic.o kvm/i8259.o kvm/ioapic.o
kvm/i8254.o
obj-$(CONFIG_SPICE) += qxl.o qxl-logger.o qxl-render.o
diff --git a/hw/xen_pt.c b/hw/xen_pt.c
index 92ad0fa..3b6d186 100644
--- a/hw/xen_pt.c
+++ b/hw/xen_pt.c
@@ -36,6 +36,20 @@
*
* Write '1'
* - Set real bit to '1'.
+ *
+ * MSI interrupt:
+ * Initialize MSI register(xen_pt_msi_setup, xen_pt_msi_update)
+ * Bind MSI(xc_domain_update_msi_irq)
+ * <fail>
+ * - Unmap MSI.
+ * - Set dev->msi->pirq to '-1'.
+ *
+ * MSI-X interrupt:
+ * Initialize MSI-X register(xen_pt_msix_update_one)
+ * Bind MSI-X(xc_domain_update_msi_irq)
+ * <fail>
+ * - Unmap MSI-X.
+ * - Set entry->pirq to '-1'.
*/
#include <sys/ioctl.h>
@@ -534,7 +548,15 @@ static void xen_pt_region_update(XenPCIPassthroughState *s,
};
bar = xen_pt_bar_from_region(s, mr);
- if (bar == -1) {
+ if (bar == -1 && (!s->msix || &s->msix->mmio != mr)) {
+ return;
+ }
+
+ if (s->msix && &s->msix->mmio == mr) {
+ if (adding) {
+ s->msix->mmio_base_addr = sec->offset_within_address_space;
+ rc = xen_pt_msix_update_remap(s, s->msix->bar_index);
+ }
return;
}
@@ -764,6 +786,13 @@ static int xen_pt_unregister_device(PCIDevice *d)
}
}
+ if (s->msi) {
+ xen_pt_msi_disable(s);
+ }
+ if (s->msix) {
+ xen_pt_msix_disable(s);
+ }
+
if (machine_irq) {
xen_pt_mapped_machine_irq[machine_irq]--;
diff --git a/hw/xen_pt.h b/hw/xen_pt.h
index 4b76073..41904ec 100644
--- a/hw/xen_pt.h
+++ b/hw/xen_pt.h
@@ -160,6 +160,36 @@ typedef struct XenPTRegGroup {
#define XEN_PT_UNASSIGNED_PIRQ (-1)
+typedef struct XenPTMSI {
+ uint16_t flags;
+ uint32_t addr_lo; /* guest message address */
+ uint32_t addr_hi; /* guest message upper address */
+ uint16_t data; /* guest message data */
+ uint32_t ctrl_offset; /* saved control offset */
+ int pirq; /* guest pirq corresponding */
+ bool initialized; /* when guest MSI is initialized */
+ bool mapped; /* when pirq is mapped */
+} XenPTMSI;
+
+typedef struct XenPTMSIXEntry {
+ int pirq;
+ uint64_t addr;
+ uint32_t data;
+ uint32_t vector_ctrl;
+ bool updated; /* indicate whether MSI ADDR or DATA is updated */
+} XenPTMSIXEntry;
+typedef struct XenPTMSIX {
+ uint32_t ctrl_offset;
+ bool enabled;
+ int total_entries;
+ int bar_index;
+ uint64_t table_base;
+ uint32_t table_offset_adjust; /* page align mmap */
+ uint64_t mmio_base_addr;
+ MemoryRegion mmio;
+ void *phys_iomem_base;
+ XenPTMSIXEntry msix_entry[0];
+} XenPTMSIX;
struct XenPCIPassthroughState {
PCIDevice dev;
@@ -172,6 +202,9 @@ struct XenPCIPassthroughState {
uint32_t machine_irq;
+ XenPTMSI *msi;
+ XenPTMSIX *msix;
+
MemoryRegion bar[PCI_NUM_REGIONS - 1];
MemoryRegion rom;
@@ -247,4 +280,22 @@ static inline uint8_t
xen_pt_pci_intx(XenPCIPassthroughState *s)
return r_val;
}
+/* MSI/MSI-X */
+int xen_pt_msi_set_enable(XenPCIPassthroughState *s, bool en);
+int xen_pt_msi_setup(XenPCIPassthroughState *s);
+int xen_pt_msi_update(XenPCIPassthroughState *d);
+void xen_pt_msi_disable(XenPCIPassthroughState *s);
+
+int xen_pt_msix_init(XenPCIPassthroughState *s, uint32_t base);
+void xen_pt_msix_delete(XenPCIPassthroughState *s);
+int xen_pt_msix_update(XenPCIPassthroughState *s);
+int xen_pt_msix_update_remap(XenPCIPassthroughState *s, int bar_index);
+void xen_pt_msix_disable(XenPCIPassthroughState *s);
+
+static inline bool xen_pt_has_msix_mapping(XenPCIPassthroughState *s, int bar)
+{
+ return s->msix && s->msix->bar_index == bar;
+}
+
+
#endif /* !XEN_PT_H */
diff --git a/hw/xen_pt_config_init.c b/hw/xen_pt_config_init.c
index 1d97876..00eb3d9 100644
--- a/hw/xen_pt_config_init.c
+++ b/hw/xen_pt_config_init.c
@@ -1022,6 +1022,410 @@ static XenPTRegInfo xen_pt_emu_reg_pm[] = {
};
+/********************************
+ * MSI Capability
+ */
+
+/* Helper */
+static bool xen_pt_msgdata_check_type(uint32_t offset, uint16_t flags)
+{
+ /* check the offset whether matches the type or not */
+ bool is_32 = (offset == PCI_MSI_DATA_32) && !(flags & PCI_MSI_FLAGS_64BIT);
+ bool is_64 = (offset == PCI_MSI_DATA_64) && (flags & PCI_MSI_FLAGS_64BIT);
+ return is_32 || is_64;
+}
+
+/* Message Control register */
+static int xen_pt_msgctrl_reg_init(XenPCIPassthroughState *s,
+ XenPTRegInfo *reg, uint32_t real_offset,
+ uint32_t *data)
+{
+ PCIDevice *d = &s->dev;
+ XenPTMSI *msi = s->msi;
+ uint16_t reg_field = 0;
+
+ /* use I/O device register's value as initial value */
+ reg_field = pci_get_word(d->config + real_offset);
+
+ if (reg_field & PCI_MSI_FLAGS_ENABLE) {
+ XEN_PT_LOG(&s->dev, "MSI already enabled, disabling it first\n");
+ xen_host_pci_set_word(&s->real_device, real_offset,
+ reg_field & ~PCI_MSI_FLAGS_ENABLE);
+ }
+ msi->flags |= reg_field;
+ msi->ctrl_offset = real_offset;
+ msi->initialized = false;
+ msi->mapped = false;
+
+ *data = reg->init_val;
+ return 0;
+}
+static int xen_pt_msgctrl_reg_write(XenPCIPassthroughState *s,
+ XenPTReg *cfg_entry, uint16_t *val,
+ uint16_t dev_value, uint16_t valid_mask)
+{
+ XenPTRegInfo *reg = cfg_entry->reg;
+ XenPTMSI *msi = s->msi;
+ uint16_t writable_mask = 0;
+ uint16_t throughable_mask = 0;
+ uint16_t raw_val;
+
+ /* Currently no support for multi-vector */
+ if (*val & PCI_MSI_FLAGS_QSIZE) {
+ XEN_PT_WARN(&s->dev, "Tries to set more than 1 vector ctrl %x\n",
*val);
+ }
+
+ /* modify emulate register */
+ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask;
+ cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask);
+ msi->flags |= cfg_entry->data & ~PCI_MSI_FLAGS_ENABLE;
+
+ /* create value for writing to I/O device register */
+ raw_val = *val;
+ throughable_mask = ~reg->emu_mask & valid_mask;
+ *val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask);
+
+ /* update MSI */
+ if (raw_val & PCI_MSI_FLAGS_ENABLE) {
+ /* setup MSI pirq for the first time */
+ if (!msi->initialized) {
+ /* Init physical one */
+ XEN_PT_LOG(&s->dev, "setup MSI\n");
+ if (xen_pt_msi_setup(s)) {
+ /* We do not broadcast the error to the framework code, so
+ * that MSI errors are contained in MSI emulation code and
+ * QEMU can go on running.
+ * Guest MSI would be actually not working.
+ */
+ *val &= ~PCI_MSI_FLAGS_ENABLE;
+ XEN_PT_WARN(&s->dev, "Can not map MSI.\n");
+ return 0;
+ }
+ if (xen_pt_msi_update(s)) {
+ *val &= ~PCI_MSI_FLAGS_ENABLE;
+ XEN_PT_WARN(&s->dev, "Can not bind MSI\n");
+ return 0;
+ }
+ msi->initialized = true;
+ msi->mapped = true;
+ }
+ msi->flags |= PCI_MSI_FLAGS_ENABLE;
+ } else {
+ msi->flags &= ~PCI_MSI_FLAGS_ENABLE;
+ }
+
+ /* pass through MSI_ENABLE bit */
+ *val &= ~PCI_MSI_FLAGS_ENABLE;
+ *val |= raw_val & PCI_MSI_FLAGS_ENABLE;
+
+ return 0;
+}
+
+/* initialize Message Upper Address register */
+static int xen_pt_msgaddr64_reg_init(XenPCIPassthroughState *s,
+ XenPTRegInfo *reg, uint32_t real_offset,
+ uint32_t *data)
+{
+ /* no need to initialize in case of 32 bit type */
+ if (!(s->msi->flags & PCI_MSI_FLAGS_64BIT)) {
+ *data = XEN_PT_INVALID_REG;
+ } else {
+ *data = reg->init_val;
+ }
+
+ return 0;
+}
+/* this function will be called twice (for 32 bit and 64 bit type) */
+/* initialize Message Data register */
+static int xen_pt_msgdata_reg_init(XenPCIPassthroughState *s,
+ XenPTRegInfo *reg, uint32_t real_offset,
+ uint32_t *data)
+{
+ uint32_t flags = s->msi->flags;
+ uint32_t offset = reg->offset;
+
+ /* check the offset whether matches the type or not */
+ if (xen_pt_msgdata_check_type(offset, flags)) {
+ *data = reg->init_val;
+ } else {
+ *data = XEN_PT_INVALID_REG;
+ }
+ return 0;
+}
+
+/* write Message Address register */
+static int xen_pt_msgaddr32_reg_write(XenPCIPassthroughState *s,
+ XenPTReg *cfg_entry, uint32_t *val,
+ uint32_t dev_value, uint32_t valid_mask)
+{
+ XenPTRegInfo *reg = cfg_entry->reg;
+ uint32_t writable_mask = 0;
+ uint32_t throughable_mask = 0;
+ uint32_t old_addr = cfg_entry->data;
+
+ /* modify emulate register */
+ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask;
+ cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask);
+ s->msi->addr_lo = cfg_entry->data;
+
+ /* create value for writing to I/O device register */
+ throughable_mask = ~reg->emu_mask & valid_mask;
+ *val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask);
+
+ /* update MSI */
+ if (cfg_entry->data != old_addr) {
+ if (s->msi->mapped) {
+ xen_pt_msi_update(s);
+ }
+ }
+
+ return 0;
+}
+/* write Message Upper Address register */
+static int xen_pt_msgaddr64_reg_write(XenPCIPassthroughState *s,
+ XenPTReg *cfg_entry, uint32_t *val,
+ uint32_t dev_value, uint32_t valid_mask)
+{
+ XenPTRegInfo *reg = cfg_entry->reg;
+ uint32_t writable_mask = 0;
+ uint32_t throughable_mask = 0;
+ uint32_t old_addr = cfg_entry->data;
+
+ /* check whether the type is 64 bit or not */
+ if (!(s->msi->flags & PCI_MSI_FLAGS_64BIT)) {
+ XEN_PT_ERR(&s->dev,
+ "Can't write to the upper address without 64 bit
support\n");
+ return -1;
+ }
+
+ /* modify emulate register */
+ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask;
+ cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask);
+ /* update the msi_info too */
+ s->msi->addr_hi = cfg_entry->data;
+
+ /* create value for writing to I/O device register */
+ throughable_mask = ~reg->emu_mask & valid_mask;
+ *val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask);
+
+ /* update MSI */
+ if (cfg_entry->data != old_addr) {
+ if (s->msi->mapped) {
+ xen_pt_msi_update(s);
+ }
+ }
+
+ return 0;
+}
+
+
+/* this function will be called twice (for 32 bit and 64 bit type) */
+/* write Message Data register */
+static int xen_pt_msgdata_reg_write(XenPCIPassthroughState *s,
+ XenPTReg *cfg_entry, uint16_t *val,
+ uint16_t dev_value, uint16_t valid_mask)
+{
+ XenPTRegInfo *reg = cfg_entry->reg;
+ XenPTMSI *msi = s->msi;
+ uint16_t writable_mask = 0;
+ uint16_t throughable_mask = 0;
+ uint16_t old_data = cfg_entry->data;
+ uint32_t offset = reg->offset;
+
+ /* check the offset whether matches the type or not */
+ if (!xen_pt_msgdata_check_type(offset, msi->flags)) {
+ /* exit I/O emulator */
+ XEN_PT_ERR(&s->dev, "the offset does not match the 32/64 bit type!\n");
+ return -1;
+ }
+
+ /* modify emulate register */
+ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask;
+ cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask);
+ /* update the msi_info too */
+ msi->data = cfg_entry->data;
+
+ /* create value for writing to I/O device register */
+ throughable_mask = ~reg->emu_mask & valid_mask;
+ *val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask);
+
+ /* update MSI */
+ if (cfg_entry->data != old_data) {
+ if (msi->mapped) {
+ xen_pt_msi_update(s);
+ }
+ }
+
+ return 0;
+}
+
+/* MSI Capability Structure reg static infomation table */
+static XenPTRegInfo xen_pt_emu_reg_msi[] = {
+ /* Next Pointer reg */
+ {
+ .offset = PCI_CAP_LIST_NEXT,
+ .size = 1,
+ .init_val = 0x00,
+ .ro_mask = 0xFF,
+ .emu_mask = 0xFF,
+ .init = xen_pt_ptr_reg_init,
+ .u.b.read = xen_pt_byte_reg_read,
+ .u.b.write = xen_pt_byte_reg_write,
+ },
+ /* Message Control reg */
+ {
+ .offset = PCI_MSI_FLAGS,
+ .size = 2,
+ .init_val = 0x0000,
+ .ro_mask = 0xFF8E,
+ .emu_mask = 0x007F,
+ .init = xen_pt_msgctrl_reg_init,
+ .u.w.read = xen_pt_word_reg_read,
+ .u.w.write = xen_pt_msgctrl_reg_write,
+ },
+ /* Message Address reg */
+ {
+ .offset = PCI_MSI_ADDRESS_LO,
+ .size = 4,
+ .init_val = 0x00000000,
+ .ro_mask = 0x00000003,
+ .emu_mask = 0xFFFFFFFF,
+ .no_wb = 1,
+ .init = xen_pt_common_reg_init,
+ .u.dw.read = xen_pt_long_reg_read,
+ .u.dw.write = xen_pt_msgaddr32_reg_write,
+ },
+ /* Message Upper Address reg (if PCI_MSI_FLAGS_64BIT set) */
+ {
+ .offset = PCI_MSI_ADDRESS_HI,
+ .size = 4,
+ .init_val = 0x00000000,
+ .ro_mask = 0x00000000,
+ .emu_mask = 0xFFFFFFFF,
+ .no_wb = 1,
+ .init = xen_pt_msgaddr64_reg_init,
+ .u.dw.read = xen_pt_long_reg_read,
+ .u.dw.write = xen_pt_msgaddr64_reg_write,
+ },
+ /* Message Data reg (16 bits of data for 32-bit devices) */
+ {
+ .offset = PCI_MSI_DATA_32,
+ .size = 2,
+ .init_val = 0x0000,
+ .ro_mask = 0x0000,
+ .emu_mask = 0xFFFF,
+ .no_wb = 1,
+ .init = xen_pt_msgdata_reg_init,
+ .u.w.read = xen_pt_word_reg_read,
+ .u.w.write = xen_pt_msgdata_reg_write,
+ },
+ /* Message Data reg (16 bits of data for 64-bit devices) */
+ {
+ .offset = PCI_MSI_DATA_64,
+ .size = 2,
+ .init_val = 0x0000,
+ .ro_mask = 0x0000,
+ .emu_mask = 0xFFFF,
+ .no_wb = 1,
+ .init = xen_pt_msgdata_reg_init,
+ .u.w.read = xen_pt_word_reg_read,
+ .u.w.write = xen_pt_msgdata_reg_write,
+ },
+ {
+ .size = 0,
+ },
+};
+
+
+/**************************************
+ * MSI-X Capability
+ */
+
+/* Message Control register for MSI-X */
+static int xen_pt_msixctrl_reg_init(XenPCIPassthroughState *s,
+ XenPTRegInfo *reg, uint32_t real_offset,
+ uint32_t *data)
+{
+ PCIDevice *d = &s->dev;
+ uint16_t reg_field = 0;
+
+ /* use I/O device register's value as initial value */
+ reg_field = pci_get_word(d->config + real_offset);
+
+ if (reg_field & PCI_MSIX_FLAGS_ENABLE) {
+ XEN_PT_LOG(d, "MSIX already enabled, disabling it first\n");
+ xen_host_pci_set_word(&s->real_device, real_offset,
+ reg_field & ~PCI_MSIX_FLAGS_ENABLE);
+ }
+
+ s->msix->ctrl_offset = real_offset;
+
+ *data = reg->init_val;
+ return 0;
+}
+static int xen_pt_msixctrl_reg_write(XenPCIPassthroughState *s,
+ XenPTReg *cfg_entry, uint16_t *val,
+ uint16_t dev_value, uint16_t valid_mask)
+{
+ XenPTRegInfo *reg = cfg_entry->reg;
+ uint16_t writable_mask = 0;
+ uint16_t throughable_mask = 0;
+ int debug_msix_enabled_old;
+
+ /* modify emulate register */
+ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask;
+ cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask);
+
+ /* create value for writing to I/O device register */
+ throughable_mask = ~reg->emu_mask & valid_mask;
+ *val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask);
+
+ /* update MSI-X */
+ if ((*val & PCI_MSIX_FLAGS_ENABLE)
+ && !(*val & PCI_MSIX_FLAGS_MASKALL)) {
+ xen_pt_msix_update(s);
+ }
+
+ debug_msix_enabled_old = s->msix->enabled;
+ s->msix->enabled = !!(*val & PCI_MSIX_FLAGS_ENABLE);
+ if (s->msix->enabled != debug_msix_enabled_old) {
+ XEN_PT_LOG(&s->dev, "%s MSI-X\n",
+ s->msix->enabled ? "enable" : "disable");
+ }
+
+ return 0;
+}
+
+/* MSI-X Capability Structure reg static infomation table */
+static XenPTRegInfo xen_pt_emu_reg_msix[] = {
+ /* Next Pointer reg */
+ {
+ .offset = PCI_CAP_LIST_NEXT,
+ .size = 1,
+ .init_val = 0x00,
+ .ro_mask = 0xFF,
+ .emu_mask = 0xFF,
+ .init = xen_pt_ptr_reg_init,
+ .u.b.read = xen_pt_byte_reg_read,
+ .u.b.write = xen_pt_byte_reg_write,
+ },
+ /* Message Control reg */
+ {
+ .offset = PCI_MSI_FLAGS,
+ .size = 2,
+ .init_val = 0x0000,
+ .ro_mask = 0x3FFF,
+ .emu_mask = 0x0000,
+ .init = xen_pt_msixctrl_reg_init,
+ .u.w.read = xen_pt_word_reg_read,
+ .u.w.write = xen_pt_msixctrl_reg_write,
+ },
+ {
+ .size = 0,
+ },
+};
+
+
/****************************
* Capabilities
*/
@@ -1115,6 +1519,49 @@ static int xen_pt_pcie_size_init(XenPCIPassthroughState
*s,
*size = pcie_size;
return 0;
}
+/* get MSI Capability Structure register group size */
+static int xen_pt_msi_size_init(XenPCIPassthroughState *s,
+ const XenPTRegGroupInfo *grp_reg,
+ uint32_t base_offset, uint8_t *size)
+{
+ PCIDevice *d = &s->dev;
+ uint16_t msg_ctrl = 0;
+ uint8_t msi_size = 0xa;
+
+ msg_ctrl = pci_get_word(d->config + (base_offset + PCI_MSI_FLAGS));
+
+ /* check if 64-bit address is capable of per-vector masking */
+ if (msg_ctrl & PCI_MSI_FLAGS_64BIT) {
+ msi_size += 4;
+ }
+ if (msg_ctrl & PCI_MSI_FLAGS_MASKBIT) {
+ msi_size += 10;
+ }
+
+ s->msi = g_new0(XenPTMSI, 1);
+ s->msi->pirq = XEN_PT_UNASSIGNED_PIRQ;
+
+ *size = msi_size;
+ return 0;
+}
+/* get MSI-X Capability Structure register group size */
+static int xen_pt_msix_size_init(XenPCIPassthroughState *s,
+ const XenPTRegGroupInfo *grp_reg,
+ uint32_t base_offset, uint8_t *size)
+{
+ int rc = 0;
+
+ rc = xen_pt_msix_init(s, base_offset);
+
+ if (rc < 0) {
+ XEN_PT_ERR(&s->dev, "Internal error: Invalid xen_pt_msix_init.\n");
+ return rc;
+ }
+
+ *size = grp_reg->grp_size;
+ return 0;
+}
+
static const XenPTRegGroupInfo xen_pt_emu_reg_grps[] = {
/* Header Type0 reg group */
@@ -1155,6 +1602,14 @@ static const XenPTRegGroupInfo xen_pt_emu_reg_grps[] = {
.grp_size = 0x04,
.size_init = xen_pt_reg_grp_size_init,
},
+ /* MSI Capability Structure reg group */
+ {
+ .grp_id = PCI_CAP_ID_MSI,
+ .grp_type = XEN_PT_GRP_TYPE_EMU,
+ .grp_size = 0xFF,
+ .size_init = xen_pt_msi_size_init,
+ .emu_regs = xen_pt_emu_reg_msi,
+ },
/* PCI-X Capabilities List Item reg group */
{
.grp_id = PCI_CAP_ID_PCIX,
@@ -1199,6 +1654,14 @@ static const XenPTRegGroupInfo xen_pt_emu_reg_grps[] = {
.size_init = xen_pt_pcie_size_init,
.emu_regs = xen_pt_emu_reg_pcie,
},
+ /* MSI-X Capability Structure reg group */
+ {
+ .grp_id = PCI_CAP_ID_MSIX,
+ .grp_type = XEN_PT_GRP_TYPE_EMU,
+ .grp_size = 0x0C,
+ .size_init = xen_pt_msix_size_init,
+ .emu_regs = xen_pt_emu_reg_msix,
+ },
{
.grp_size = 0,
},
@@ -1384,6 +1847,14 @@ void xen_pt_config_delete(XenPCIPassthroughState *s)
struct XenPTRegGroup *reg_group, *next_grp;
struct XenPTReg *reg, *next_reg;
+ /* free MSI/MSI-X info table */
+ if (s->msix) {
+ xen_pt_msix_delete(s);
+ }
+ if (s->msi) {
+ g_free(s->msi);
+ }
+
/* free all register group entry */
QLIST_FOREACH_SAFE(reg_group, &s->reg_grps, entries, next_grp) {
/* free all register entry */
diff --git a/hw/xen_pt_msi.c b/hw/xen_pt_msi.c
new file mode 100644
index 0000000..2299cc7
--- /dev/null
+++ b/hw/xen_pt_msi.c
@@ -0,0 +1,620 @@
+/*
+ * Copyright (c) 2007, Intel Corporation.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ * Jiang Yunhong <yunhong.jiang@xxxxxxxxx>
+ *
+ * This file implements direct PCI assignment to a HVM guest
+ */
+
+#include <sys/mman.h>
+
+#include "xen_backend.h"
+#include "xen_pt.h"
+#include "apic-msidef.h"
+
+
+#define XEN_PT_AUTO_ASSIGN -1
+
+/* shift count for gflags */
+#define XEN_PT_GFLAGS_SHIFT_DEST_ID 0
+#define XEN_PT_GFLAGS_SHIFT_RH 8
+#define XEN_PT_GFLAGS_SHIFT_DM 9
+#define XEN_PT_GFLAGSSHIFT_DELIV_MODE 12
+#define XEN_PT_GFLAGSSHIFT_TRG_MODE 15
+
+
+/*
+ * Helpers
+ */
+
+static inline uint8_t msi_vector(uint32_t data)
+{
+ return (data & MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
+}
+
+static inline uint8_t msi_dest_id(uint32_t addr)
+{
+ return (addr & MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
+}
+
+static inline uint32_t msi_ext_dest_id(uint32_t addr_hi)
+{
+ return addr_hi & 0xffffff00;
+}
+
+static uint32_t msi_gflags(uint32_t data, uint64_t addr)
+{
+ uint32_t result = 0;
+ int rh, dm, dest_id, deliv_mode, trig_mode;
+
+ rh = (addr >> MSI_ADDR_REDIRECTION_SHIFT) & 0x1;
+ dm = (addr >> MSI_ADDR_DEST_MODE_SHIFT) & 0x1;
+ dest_id = msi_dest_id(addr);
+ deliv_mode = (data >> MSI_DATA_DELIVERY_MODE_SHIFT) & 0x7;
+ trig_mode = (data >> MSI_DATA_TRIGGER_SHIFT) & 0x1;
+
+ result = dest_id | (rh << XEN_PT_GFLAGS_SHIFT_RH)
+ | (dm << XEN_PT_GFLAGS_SHIFT_DM)
+ | (deliv_mode << XEN_PT_GFLAGSSHIFT_DELIV_MODE)
+ | (trig_mode << XEN_PT_GFLAGSSHIFT_TRG_MODE);
+
+ return result;
+}
+
+static inline uint64_t msi_addr64(XenPTMSI *msi)
+{
+ return (uint64_t)msi->addr_hi << 32 | msi->addr_lo;
+}
+
+static int msi_msix_enable(XenPCIPassthroughState *s,
+ uint32_t address,
+ uint16_t flag,
+ bool enable)
+{
+ uint16_t val = 0;
+
+ if (!address) {
+ return -1;
+ }
+
+ xen_host_pci_get_word(&s->real_device, address, &val);
+ if (enable) {
+ val |= flag;
+ } else {
+ val &= ~flag;
+ }
+ xen_host_pci_set_word(&s->real_device, address, val);
+ return 0;
+}
+
+static int msi_msix_setup(XenPCIPassthroughState *s,
+ uint64_t addr,
+ uint32_t data,
+ int *ppirq,
+ bool is_msix,
+ int msix_entry,
+ bool is_not_mapped)
+{
+ uint8_t gvec = msi_vector(data);
+ int rc = 0;
+
+ assert((!is_msix && msix_entry == 0) || is_msix);
+
+ if (gvec == 0) {
+ /* if gvec is 0, the guest is asking for a particular pirq that
+ * is passed as dest_id */
+ *ppirq = msi_ext_dest_id(addr >> 32) | msi_dest_id(addr);
+ if (!*ppirq) {
+ /* this probably identifies an misconfiguration of the guest,
+ * try the emulated path */
+ *ppirq = XEN_PT_UNASSIGNED_PIRQ;
+ } else {
+ XEN_PT_LOG(&s->dev, "requested pirq %d for MSI%s"
+ " (vec: %#x, entry: %#x)\n",
+ *ppirq, is_msix ? "-X" : "", gvec, msix_entry);
+ }
+ }
+
+ if (is_not_mapped) {
+ uint64_t table_base = 0;
+
+ if (is_msix) {
+ table_base = s->msix->table_base;
+ }
+
+ rc = xc_physdev_map_pirq_msi(xen_xc, xen_domid, XEN_PT_AUTO_ASSIGN,
+ ppirq, PCI_DEVFN(s->real_device.dev,
+ s->real_device.func),
+ s->real_device.bus,
+ msix_entry, table_base);
+ if (rc) {
+ XEN_PT_ERR(&s->dev,
+ "Mapping of MSI%s (rc: %i, vec: %#x, entry %#x)\n",
+ is_msix ? "-X" : "", rc, gvec, msix_entry);
+ return rc;
+ }
+ }
+
+ return 0;
+}
+static int msi_msix_update(XenPCIPassthroughState *s,
+ uint64_t addr,
+ uint32_t data,
+ int pirq,
+ bool is_msix,
+ int msix_entry,
+ int *old_pirq)
+{
+ PCIDevice *d = &s->dev;
+ uint8_t gvec = msi_vector(data);
+ uint32_t gflags = msi_gflags(data, addr);
+ int rc = 0;
+ uint64_t table_addr = 0;
+
+ XEN_PT_LOG(d, "Updating MSI%s with pirq %d gvec %#x gflags %#x"
+ " (entry: %#x)\n",
+ is_msix ? "-X" : "", pirq, gvec, gflags, msix_entry);
+
+ if (is_msix) {
+ table_addr = s->msix->mmio_base_addr;
+ }
+
+ rc = xc_domain_update_msi_irq(xen_xc, xen_domid, gvec,
+ pirq, gflags, table_addr);
+
+ if (rc) {
+ XEN_PT_ERR(d, "Updating of MSI%s failed. (rc: %d)\n",
+ is_msix ? "-X" : "", rc);
+
+ if (xc_physdev_unmap_pirq(xen_xc, xen_domid, *old_pirq)) {
+ XEN_PT_ERR(d, "Unmapping of MSI%s pirq %d failed.\n",
+ is_msix ? "-X" : "", *old_pirq);
+ }
+ *old_pirq = XEN_PT_UNASSIGNED_PIRQ;
+ }
+ return rc;
+}
+
+static int msi_msix_disable(XenPCIPassthroughState *s,
+ uint64_t addr,
+ uint32_t data,
+ int pirq,
+ bool is_msix,
+ bool is_binded)
+{
+ PCIDevice *d = &s->dev;
+ uint8_t gvec = msi_vector(data);
+ uint32_t gflags = msi_gflags(data, addr);
+ int rc = 0;
+
+ if (pirq == XEN_PT_UNASSIGNED_PIRQ) {
+ return 0;
+ }
+
+ if (is_binded) {
+ XEN_PT_LOG(d, "Unbind MSI%s with pirq %d, gvec %#x\n",
+ is_msix ? "-X" : "", pirq, gvec);
+ rc = xc_domain_unbind_msi_irq(xen_xc, xen_domid, gvec, pirq, gflags);
+ if (rc) {
+ XEN_PT_ERR(d, "Unbinding of MSI%s failed. (pirq: %d, gvec: %#x)\n",
+ is_msix ? "-X" : "", pirq, gvec);
+ return rc;
+ }
+ }
+
+ XEN_PT_LOG(d, "Unmap MSI%s pirq %d\n", is_msix ? "-X" : "", pirq);
+ rc = xc_physdev_unmap_pirq(xen_xc, xen_domid, pirq);
+ if (rc) {
+ XEN_PT_ERR(d, "Unmapping of MSI%s pirq %d failed. (rc: %i)\n",
+ is_msix ? "-X" : "", pirq, rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+/*
+ * MSI virtualization functions
+ */
+
+int xen_pt_msi_set_enable(XenPCIPassthroughState *s, bool enable)
+{
+ XEN_PT_LOG(&s->dev, "%s MSI.\n", enable ? "enabling" : "disabling");
+
+ if (!s->msi) {
+ return -1;
+ }
+
+ return msi_msix_enable(s, s->msi->ctrl_offset, PCI_MSI_FLAGS_ENABLE,
+ enable);
+}
+
+/* setup physical msi, but don't enable it */
+int xen_pt_msi_setup(XenPCIPassthroughState *s)
+{
+ int pirq = XEN_PT_UNASSIGNED_PIRQ;
+ int rc = 0;
+ XenPTMSI *msi = s->msi;
+
+ if (msi->initialized) {
+ XEN_PT_ERR(&s->dev,
+ "Setup physical MSI when it has been properly
initialized.\n");
+ return -1;
+ }
+
+ rc = msi_msix_setup(s, msi_addr64(msi), msi->data, &pirq, false, 0, true);
+ if (rc) {
+ return rc;
+ }
+
+ if (pirq < 0) {
+ XEN_PT_ERR(&s->dev, "Invalid pirq number: %d.\n", pirq);
+ return -1;
+ }
+
+ msi->pirq = pirq;
+ XEN_PT_LOG(&s->dev, "MSI mapped with pirq %d.\n", pirq);
+
+ return 0;
+}
+
+int xen_pt_msi_update(XenPCIPassthroughState *s)
+{
+ XenPTMSI *msi = s->msi;
+ return msi_msix_update(s, msi_addr64(msi), msi->data, msi->pirq,
+ false, 0, &msi->pirq);
+}
+
+void xen_pt_msi_disable(XenPCIPassthroughState *s)
+{
+ XenPTMSI *msi = s->msi;
+
+ if (!msi) {
+ return;
+ }
+
+ xen_pt_msi_set_enable(s, false);
+
+ msi_msix_disable(s, msi_addr64(msi), msi->data, msi->pirq, false,
+ msi->initialized);
+
+ /* clear msi info */
+ msi->flags = 0;
+ msi->mapped = false;
+ msi->pirq = XEN_PT_UNASSIGNED_PIRQ;
+}
+
+/*
+ * MSI-X virtualization functions
+ */
+
+static int msix_set_enable(XenPCIPassthroughState *s, bool enabled)
+{
+ XEN_PT_LOG(&s->dev, "%s MSI-X.\n", enabled ? "enabling" : "disabling");
+
+ if (!s->msix) {
+ return -1;
+ }
+
+ return msi_msix_enable(s, s->msix->ctrl_offset, PCI_MSIX_FLAGS_ENABLE,
+ enabled);
+}
+
+static int xen_pt_msix_update_one(XenPCIPassthroughState *s, int entry_nr)
+{
+ XenPTMSIXEntry *entry = NULL;
+ int pirq;
+ int rc;
+
+ if (entry_nr < 0 || entry_nr >= s->msix->total_entries) {
+ return -EINVAL;
+ }
+
+ entry = &s->msix->msix_entry[entry_nr];
+
+ if (!entry->updated) {
+ return 0;
+ }
+
+ pirq = entry->pirq;
+
+ rc = msi_msix_setup(s, entry->data, entry->data, &pirq, true, entry_nr,
+ entry->pirq == XEN_PT_UNASSIGNED_PIRQ);
+ if (rc) {
+ return rc;
+ }
+ if (entry->pirq == XEN_PT_UNASSIGNED_PIRQ) {
+ entry->pirq = pirq;
+ }
+
+ rc = msi_msix_update(s, entry->addr, entry->data, pirq, true,
+ entry_nr, &entry->pirq);
+
+ if (!rc) {
+ entry->updated = false;
+ }
+
+ return rc;
+}
+
+int xen_pt_msix_update(XenPCIPassthroughState *s)
+{
+ XenPTMSIX *msix = s->msix;
+ int i;
+
+ for (i = 0; i < msix->total_entries; i++) {
+ xen_pt_msix_update_one(s, i);
+ }
+
+ return 0;
+}
+
+void xen_pt_msix_disable(XenPCIPassthroughState *s)
+{
+ int i = 0;
+
+ msix_set_enable(s, false);
+
+ for (i = 0; i < s->msix->total_entries; i++) {
+ XenPTMSIXEntry *entry = &s->msix->msix_entry[i];
+
+ msi_msix_disable(s, entry->addr, entry->data, entry->pirq, true, true);
+
+ /* clear MSI-X info */
+ entry->pirq = XEN_PT_UNASSIGNED_PIRQ;
+ entry->updated = false;
+ }
+}
+
+int xen_pt_msix_update_remap(XenPCIPassthroughState *s, int bar_index)
+{
+ XenPTMSIXEntry *entry;
+ int i, ret;
+
+ if (!(s->msix && s->msix->bar_index == bar_index)) {
+ return 0;
+ }
+
+ for (i = 0; i < s->msix->total_entries; i++) {
+ entry = &s->msix->msix_entry[i];
+ if (entry->pirq != XEN_PT_UNASSIGNED_PIRQ) {
+ ret = xc_domain_unbind_pt_irq(xen_xc, xen_domid, entry->pirq,
+ PT_IRQ_TYPE_MSI, 0, 0, 0, 0);
+ if (ret) {
+ XEN_PT_ERR(&s->dev, "unbind MSI-X entry %d failed\n",
+ entry->pirq);
+ }
+ entry->updated = true;
+ }
+ }
+ return xen_pt_msix_update(s);
+}
+
+static uint32_t get_entry_value(XenPTMSIXEntry *e, int offset)
+{
+ switch (offset) {
+ case PCI_MSIX_ENTRY_LOWER_ADDR:
+ return e->addr & UINT32_MAX;
+ case PCI_MSIX_ENTRY_UPPER_ADDR:
+ return e->addr >> 32;
+ case PCI_MSIX_ENTRY_DATA:
+ return e->data;
+ case PCI_MSIX_ENTRY_VECTOR_CTRL:
+ return e->vector_ctrl;
+ default:
+ return 0;
+ }
+}
+
+static void set_entry_value(XenPTMSIXEntry *e, int offset, uint32_t val)
+{
+ switch (offset) {
+ case PCI_MSIX_ENTRY_LOWER_ADDR:
+ e->addr = (e->addr & ((uint64_t)UINT32_MAX << 32)) | val;
+ break;
+ case PCI_MSIX_ENTRY_UPPER_ADDR:
+ e->addr = (uint64_t)val << 32 | (e->addr & UINT32_MAX);
+ break;
+ case PCI_MSIX_ENTRY_DATA:
+ e->data = val;
+ break;
+ case PCI_MSIX_ENTRY_VECTOR_CTRL:
+ e->vector_ctrl = val;
+ break;
+ }
+}
+
+static void pci_msix_write(void *opaque, target_phys_addr_t addr,
+ uint64_t val, unsigned size)
+{
+ XenPCIPassthroughState *s = opaque;
+ XenPTMSIX *msix = s->msix;
+ XenPTMSIXEntry *entry;
+ int entry_nr, offset;
+
+ entry_nr = addr / PCI_MSIX_ENTRY_SIZE;
+ if (entry_nr < 0 || entry_nr >= msix->total_entries) {
+ XEN_PT_ERR(&s->dev, "asked MSI-X entry '%i' invalid!\n", entry_nr);
+ return;
+ }
+ entry = &msix->msix_entry[entry_nr];
+ offset = addr % PCI_MSIX_ENTRY_SIZE;
+
+ if (offset != PCI_MSIX_ENTRY_VECTOR_CTRL) {
+ const volatile uint32_t *vec_ctrl;
+
+ if (get_entry_value(entry, offset) == val) {
+ return;
+ }
+
+ /*
+ * If Xen intercepts the mask bit access, entry->vec_ctrl may not be
+ * up-to-date. Read from hardware directly.
+ */
+ vec_ctrl = s->msix->phys_iomem_base + entry_nr * PCI_MSIX_ENTRY_SIZE
+ + PCI_MSIX_ENTRY_VECTOR_CTRL;
+
+ if (msix->enabled && !(*vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT)) {
+ XEN_PT_ERR(&s->dev, "Can't update msix entry %d since MSI-X is"
+ " already enabled.\n", entry_nr);
+ return;
+ }
+
+ entry->updated = true;
+ }
+
+ set_entry_value(entry, offset, val);
+
+ if (offset == PCI_MSIX_ENTRY_VECTOR_CTRL) {
+ if (msix->enabled && !(val & PCI_MSIX_ENTRY_CTRL_MASKBIT)) {
+ xen_pt_msix_update_one(s, entry_nr);
+ }
+ }
+}
+
+static uint64_t pci_msix_read(void *opaque, target_phys_addr_t addr,
+ unsigned size)
+{
+ XenPCIPassthroughState *s = opaque;
+ XenPTMSIX *msix = s->msix;
+ int entry_nr, offset;
+
+ entry_nr = addr / PCI_MSIX_ENTRY_SIZE;
+ if (entry_nr < 0) {
+ XEN_PT_ERR(&s->dev, "asked MSI-X entry '%i' invalid!\n", entry_nr);
+ return 0;
+ }
+
+ offset = addr % PCI_MSIX_ENTRY_SIZE;
+
+ if (addr < msix->total_entries * PCI_MSIX_ENTRY_SIZE) {
+ return get_entry_value(&msix->msix_entry[entry_nr], offset);
+ } else {
+ /* Pending Bit Array (PBA) */
+ return *(uint32_t *)(msix->phys_iomem_base + addr);
+ }
+}
+
+static const MemoryRegionOps pci_msix_ops = {
+ .read = pci_msix_read,
+ .write = pci_msix_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ .unaligned = false,
+ },
+};
+
+int xen_pt_msix_init(XenPCIPassthroughState *s, uint32_t base)
+{
+ uint8_t id = 0;
+ uint16_t control = 0;
+ uint32_t table_off = 0;
+ int i, total_entries, bar_index;
+ XenHostPCIDevice *hd = &s->real_device;
+ PCIDevice *d = &s->dev;
+ int fd = -1;
+ XenPTMSIX *msix = NULL;
+ int rc = 0;
+
+ rc = xen_host_pci_get_byte(hd, base + PCI_CAP_LIST_ID, &id);
+ if (rc) {
+ return rc;
+ }
+
+ if (id != PCI_CAP_ID_MSIX) {
+ XEN_PT_ERR(d, "Invalid id %#x base %#x\n", id, base);
+ return -1;
+ }
+
+ xen_host_pci_get_word(hd, base + PCI_MSIX_FLAGS, &control);
+ total_entries = control & PCI_MSIX_FLAGS_QSIZE;
+ total_entries += 1;
+
+ s->msix = g_malloc0(sizeof (XenPTMSIX)
+ + total_entries * sizeof (XenPTMSIXEntry));
+ msix = s->msix;
+
+ msix->total_entries = total_entries;
+ for (i = 0; i < total_entries; i++) {
+ msix->msix_entry[i].pirq = XEN_PT_UNASSIGNED_PIRQ;
+ }
+
+ memory_region_init_io(&msix->mmio, &pci_msix_ops, s, "xen-pci-pt-msix",
+ (total_entries * PCI_MSIX_ENTRY_SIZE
+ + XC_PAGE_SIZE - 1)
+ & XC_PAGE_MASK);
+
+ xen_host_pci_get_long(hd, base + PCI_MSIX_TABLE, &table_off);
+ bar_index = msix->bar_index = table_off & PCI_MSIX_FLAGS_BIRMASK;
+ table_off = table_off & ~PCI_MSIX_FLAGS_BIRMASK;
+ msix->table_base = s->real_device.io_regions[bar_index].base_addr;
+ XEN_PT_LOG(d, "get MSI-X table BAR base 0x%"PRIx64"\n", msix->table_base);
+
+ fd = open("/dev/mem", O_RDWR);
+ if (fd == -1) {
+ rc = -errno;
+ XEN_PT_ERR(d, "Can't open /dev/mem: %s\n", strerror(errno));
+ goto error_out;
+ }
+ XEN_PT_LOG(d, "table_off = %#x, total_entries = %d\n",
+ table_off, total_entries);
+ msix->table_offset_adjust = table_off & 0x0fff;
+ msix->phys_iomem_base =
+ mmap(NULL,
+ total_entries * PCI_MSIX_ENTRY_SIZE + msix->table_offset_adjust,
+ PROT_READ,
+ MAP_SHARED | MAP_LOCKED,
+ fd,
+ msix->table_base + table_off - msix->table_offset_adjust);
+ close(fd);
+ if (msix->phys_iomem_base == MAP_FAILED) {
+ rc = -errno;
+ XEN_PT_ERR(d, "Can't map physical MSI-X table: %s\n", strerror(errno));
+ goto error_out;
+ }
+ msix->phys_iomem_base = (char *)msix->phys_iomem_base
+ + msix->table_offset_adjust;
+
+ XEN_PT_LOG(d, "mapping physical MSI-X table to %p\n",
+ msix->phys_iomem_base);
+
+ memory_region_add_subregion_overlap(&s->bar[bar_index], table_off,
+ &msix->mmio,
+ 2); /* Priority: pci default + 1 */
+
+ return 0;
+
+error_out:
+ memory_region_destroy(&msix->mmio);
+ g_free(s->msix);
+ s->msix = NULL;
+ return rc;
+}
+
+void xen_pt_msix_delete(XenPCIPassthroughState *s)
+{
+ XenPTMSIX *msix = s->msix;
+
+ if (!msix) {
+ return;
+ }
+
+ /* unmap the MSI-X memory mapped register area */
+ if (msix->phys_iomem_base) {
+ XEN_PT_LOG(&s->dev, "unmapping physical MSI-X table from %p\n",
+ msix->phys_iomem_base);
+ munmap(msix->phys_iomem_base, msix->total_entries * PCI_MSIX_ENTRY_SIZE
+ + msix->table_offset_adjust);
+ }
+
+ memory_region_del_subregion(&s->bar[msix->bar_index], &msix->mmio);
+ memory_region_destroy(&msix->mmio);
+
+ g_free(s->msix);
+ s->msix = NULL;
+}
--
Anthony PERARD
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