From: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Introduce a new emulated PCI device, specific to fully virtualized Xen
guests. The device is necessary for PV on HVM drivers to work.
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
Makefile.target | 1 +
hw/xen_machine_fv.c | 4 +
hw/xen_platform.c | 452 +++++++++++++++++++++++++++++++++++++++++++++++++++
hw/xen_platform.h | 9 +
4 files changed, 466 insertions(+), 0 deletions(-)
create mode 100644 hw/xen_platform.c
create mode 100644 hw/xen_platform.h
diff --git a/Makefile.target b/Makefile.target
index d1b63f2..1984cdd 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -324,6 +324,7 @@ obj-xen-y += pc.o
obj-xen-y += piix_pci.o
obj-xen-y += mc146818rtc.o
obj-xen-y += xenstore.o
+obj-xen-y += xen_platform.o
obj-xen-y += xen_mapcache.o
obj-xen-y += stub-functions.o
diff --git a/hw/xen_machine_fv.c b/hw/xen_machine_fv.c
index 114addf..ec826e7 100644
--- a/hw/xen_machine_fv.c
+++ b/hw/xen_machine_fv.c
@@ -35,6 +35,7 @@
#include "xen_common.h"
#include "xen_backend.h"
#include "xenstore.h"
+#include "xen_platform.h"
#include "xen/hvm/hvm_info_table.h"
#define MAX_IDE_BUS 2
@@ -93,6 +94,9 @@ static void xen_init_fv(ram_addr_t ram_size,
pc_vga_init(pci_bus);
+ pci_xen_platform_init(pci_bus);
+ platform_fixed_ioport_init();
+
/* init basic PC hardware */
pc_basic_device_init(isa_irq, &floppy_controller, &rtc_state);
diff --git a/hw/xen_platform.c b/hw/xen_platform.c
new file mode 100644
index 0000000..85d3f8b
--- /dev/null
+++ b/hw/xen_platform.c
@@ -0,0 +1,452 @@
+/*
+ * XEN platform pci device, formerly known as the event channel device
+ *
+ * Copyright (c) 2003-2004 Intel Corp.
+ * Copyright (c) 2006 XenSource
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "hw.h"
+#include "pc.h"
+#include "pci.h"
+#include "irq.h"
+#include "xen_common.h"
+#include "net.h"
+#include "xen_platform.h"
+#include "xen_backend.h"
+#include "qemu-log.h"
+
+#include <assert.h>
+#include <xenguest.h>
+
+static int drivers_blacklisted;
+static uint16_t driver_product_version;
+static int throttling_disabled;
+static char log_buffer[4096];
+static int log_buffer_off;
+
+static uint8_t platform_flags;
+
+#define PFFLAG_ROM_LOCK 1 /* Sets whether ROM memory area is RW or RO */
+
+typedef struct PCIXenPlatformState
+{
+ PCIDevice pci_dev;
+} PCIXenPlatformState;
+
+
+/* We throttle access to dom0 syslog, to avoid DOS attacks. This is
+ modelled as a token bucket, with one token for every byte of log.
+ The bucket size is 128KB (->1024 lines of 128 bytes each) and
+ refills at 256B/s. It starts full. The guest is blocked if no
+ tokens are available when it tries to generate a log message. */
+#define BUCKET_MAX_SIZE (128*1024)
+#define BUCKET_FILL_RATE 256
+
+static void throttle(unsigned count)
+{
+ static unsigned available;
+ static struct timespec last_refil;
+ static int started;
+ static int warned;
+
+ struct timespec waiting_for, now;
+ double delay;
+ struct timespec ts;
+
+ if (throttling_disabled)
+ return;
+
+ if (!started) {
+ clock_gettime(CLOCK_MONOTONIC, &last_refil);
+ available = BUCKET_MAX_SIZE;
+ started = 1;
+ }
+
+ if (count > BUCKET_MAX_SIZE) {
+ fprintf(stderr, "tried to get %d tokens, but bucket size is %d\n",
+ BUCKET_MAX_SIZE, count);
+ exit(1);
+ }
+
+ if (available < count) {
+ /* The bucket is empty. Refil it */
+
+ /* When will it be full enough to handle this request? */
+ delay = (double)(count - available) / BUCKET_FILL_RATE;
+ waiting_for = last_refil;
+ waiting_for.tv_sec += delay;
+ waiting_for.tv_nsec += (delay - (int)delay) * 1e9;
+ if (waiting_for.tv_nsec >= 1000000000) {
+ waiting_for.tv_nsec -= 1000000000;
+ waiting_for.tv_sec++;
+ }
+
+ /* How long do we have to wait? (might be negative) */
+ clock_gettime(CLOCK_MONOTONIC, &now);
+ ts.tv_sec = waiting_for.tv_sec - now.tv_sec;
+ ts.tv_nsec = waiting_for.tv_nsec - now.tv_nsec;
+ if (ts.tv_nsec < 0) {
+ ts.tv_sec--;
+ ts.tv_nsec += 1000000000;
+ }
+
+ /* Wait for it. */
+ if (ts.tv_sec > 0 ||
+ (ts.tv_sec == 0 && ts.tv_nsec > 0)) {
+ if (!warned) {
+ fprintf(stderr, "throttling guest access to syslog");
+ warned = 1;
+ }
+ while (nanosleep(&ts, &ts) < 0 && errno == EINTR)
+ ;
+ }
+
+ /* Refil */
+ clock_gettime(CLOCK_MONOTONIC, &now);
+ delay = (now.tv_sec - last_refil.tv_sec) +
+ (now.tv_nsec - last_refil.tv_nsec) * 1.0e-9;
+ available += BUCKET_FILL_RATE * delay;
+ if (available > BUCKET_MAX_SIZE)
+ available = BUCKET_MAX_SIZE;
+ last_refil = now;
+ }
+
+ assert(available >= count);
+
+ available -= count;
+}
+
+#define UNPLUG_ALL_IDE_DISKS 1
+#define UNPLUG_ALL_NICS 2
+#define UNPLUG_AUX_IDE_DISKS 4
+
+static void platform_fixed_ioport_write2(void *opaque, uint32_t addr, uint32_t
val)
+{
+ switch (addr - 0x10) {
+ case 0:
+ /* Unplug devices. Value is a bitmask of which devices to
+ unplug, with bit 0 the IDE devices, bit 1 the network
+ devices, and bit 2 the non-primary-master IDE devices. */
+ break;
+ case 2:
+ switch (val) {
+ case 1:
+ fprintf(stderr, "Citrix Windows PV drivers loaded in guest\n");
+ break;
+ case 0:
+ fprintf(stderr, "Guest claimed to be running PV product 0?\n");
+ break;
+ default:
+ fprintf(stderr, "Unknown PV product %d loaded in guest\n", val);
+ break;
+ }
+ driver_product_version = val;
+ break;
+ }
+}
+
+static void platform_fixed_ioport_write4(void *opaque, uint32_t addr,
+ uint32_t val)
+{
+ switch (addr - 0x10) {
+ case 0:
+ /* PV driver version */
+ break;
+ }
+}
+
+static void platform_fixed_ioport_write1(void *opaque, uint32_t addr, uint32_t
val)
+{
+ switch (addr - 0x10) {
+ case 0: /* Platform flags */ {
+ hvmmem_type_t mem_type = (val & PFFLAG_ROM_LOCK) ?
+ HVMMEM_ram_ro : HVMMEM_ram_rw;
+ if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type, 0xc0, 0x40))
+ fprintf(stderr,"platform_fixed_ioport: unable to change ro/rw "
+ "state of ROM memory area!\n");
+ else {
+ platform_flags = val & PFFLAG_ROM_LOCK;
+ fprintf(stderr,"platform_fixed_ioport: changed ro/rw "
+ "state of ROM memory area. now is %s state.\n",
+ (mem_type == HVMMEM_ram_ro ? "ro":"rw"));
+ }
+ break;
+ }
+ case 2:
+ /* Send bytes to syslog */
+ if (val == '\n' || log_buffer_off == sizeof(log_buffer) - 1) {
+ /* Flush buffer */
+ log_buffer[log_buffer_off] = 0;
+ throttle(log_buffer_off);
+ fprintf(stderr, "%s\n", log_buffer);
+ log_buffer_off = 0;
+ break;
+ }
+ log_buffer[log_buffer_off++] = val;
+ break;
+ }
+}
+
+static uint32_t platform_fixed_ioport_read2(void *opaque, uint32_t addr)
+{
+ switch (addr - 0x10) {
+ case 0:
+ if (drivers_blacklisted) {
+ /* The drivers will recognise this magic number and refuse
+ * to do anything. */
+ return 0xd249;
+ } else {
+ /* Magic value so that you can identify the interface. */
+ return 0x49d2;
+ }
+ default:
+ return 0xffff;
+ }
+}
+
+static uint32_t platform_fixed_ioport_read1(void *opaque, uint32_t addr)
+{
+ switch (addr - 0x10) {
+ case 0:
+ /* Platform flags */
+ return platform_flags;
+ case 2:
+ /* Version number */
+ return 1;
+ default:
+ return 0xff;
+ }
+}
+
+static void platform_fixed_ioport_save(QEMUFile *f, void *opaque)
+{
+ qemu_put_8s(f, &platform_flags);
+}
+
+static int platform_fixed_ioport_load(QEMUFile *f, void *opaque, int
version_id)
+{
+ uint8_t flags;
+
+ if (version_id > 1)
+ return -EINVAL;
+
+ qemu_get_8s(f, &flags);
+ platform_fixed_ioport_write1(NULL, 0x10, flags);
+
+ return 0;
+}
+
+void platform_fixed_ioport_init(void)
+{
+ register_savevm(NULL, "platform_fixed_ioport", 0, 1,
platform_fixed_ioport_save,
+ platform_fixed_ioport_load, NULL);
+
+ register_ioport_write(0x10, 16, 4, platform_fixed_ioport_write4, NULL);
+ register_ioport_write(0x10, 16, 2, platform_fixed_ioport_write2, NULL);
+ register_ioport_write(0x10, 16, 1, platform_fixed_ioport_write1, NULL);
+ register_ioport_read(0x10, 16, 2, platform_fixed_ioport_read2, NULL);
+ register_ioport_read(0x10, 16, 1, platform_fixed_ioport_read1, NULL);
+
+ platform_fixed_ioport_write1(NULL, 0x10, 0);
+}
+
+static uint32_t xen_platform_ioport_readb(void *opaque, uint32_t addr)
+{
+ addr &= 0xff;
+
+ return (addr == 0) ? platform_fixed_ioport_read1(NULL, 0x10) : ~0u;
+}
+
+static void xen_platform_ioport_writeb(void *opaque, uint32_t addr, uint32_t
val)
+{
+ addr &= 0xff;
+ val &= 0xff;
+
+ switch (addr) {
+ case 0: /* Platform flags */
+ platform_fixed_ioport_write1(NULL, 0x10, val);
+ break;
+ case 8:
+ {
+ if (val == '\n' || log_buffer_off == sizeof(log_buffer) - 1) {
+ /* Flush buffer */
+ log_buffer[log_buffer_off] = 0;
+ throttle(log_buffer_off);
+ fprintf(stderr, "%s\n", log_buffer);
+ log_buffer_off = 0;
+ break;
+ }
+ log_buffer[log_buffer_off++] = val;
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+static void platform_ioport_map(PCIDevice *pci_dev, int region_num, pcibus_t
addr, pcibus_t size, int type)
+{
+ PCIXenPlatformState *d = (PCIXenPlatformState *)pci_dev;
+ register_ioport_write(addr, size, 1, xen_platform_ioport_writeb, d);
+ register_ioport_read(addr, size, 1, xen_platform_ioport_readb, d);
+}
+
+static uint32_t platform_mmio_read(void *opaque, target_phys_addr_t addr)
+{
+ static int warnings = 0;
+ if (warnings < 5) {
+ fprintf(stderr, "Warning: attempted read from physical address "
+ "0x%"PRIx64" in xen platform mmio space\n", (uint64_t)addr);
+ warnings++;
+ }
+ return 0;
+}
+
+static void platform_mmio_write(void *opaque, target_phys_addr_t addr,
+ uint32_t val)
+{
+ static int warnings = 0;
+ if (warnings < 5) {
+ fprintf(stderr, "Warning: attempted write of 0x%x to physical "
+ "address 0x%"PRIx64" in xen platform mmio space\n",
+ val, (uint64_t)addr);
+ warnings++;
+ }
+ return;
+}
+
+static CPUReadMemoryFunc *platform_mmio_read_funcs[3] = {
+ platform_mmio_read,
+ platform_mmio_read,
+ platform_mmio_read,
+};
+
+static CPUWriteMemoryFunc *platform_mmio_write_funcs[3] = {
+ platform_mmio_write,
+ platform_mmio_write,
+ platform_mmio_write,
+};
+
+static void platform_mmio_map(PCIDevice *d, int region_num,
+ pcibus_t addr, pcibus_t size, int type)
+{
+ int mmio_io_addr;
+
+ mmio_io_addr = cpu_register_io_memory(platform_mmio_read_funcs,
+ platform_mmio_write_funcs, NULL);
+
+ cpu_register_physical_memory(addr, 0x1000000, mmio_io_addr);
+}
+
+struct pci_config_header {
+ uint16_t vendor_id;
+ uint16_t device_id;
+ uint16_t command;
+ uint16_t status;
+ uint8_t revision;
+ uint8_t api;
+ uint8_t subclass;
+ uint8_t class;
+ uint8_t cache_line_size; /* Units of 32 bit words */
+ uint8_t latency_timer; /* In units of bus cycles */
+ uint8_t header_type; /* Should be 0 */
+ uint8_t bist; /* Built in self test */
+ uint32_t base_address_regs[6];
+ uint32_t reserved1;
+ uint16_t subsystem_vendor_id;
+ uint16_t subsystem_id;
+ uint32_t rom_addr;
+ uint32_t reserved3;
+ uint32_t reserved4;
+ uint8_t interrupt_line;
+ uint8_t interrupt_pin;
+ uint8_t min_gnt;
+ uint8_t max_lat;
+};
+
+static void xen_pci_save(QEMUFile *f, void *opaque)
+{
+ PCIXenPlatformState *d = opaque;
+ uint64_t t = 0;
+
+ pci_device_save(&d->pci_dev, f);
+ qemu_put_be64s(f, &t);
+}
+
+static int xen_pci_load(QEMUFile *f, void *opaque, int version_id)
+{
+ PCIXenPlatformState *d = opaque;
+ int ret;
+
+ if (version_id > 3)
+ return -EINVAL;
+
+ ret = pci_device_load(&d->pci_dev, f);
+ if (ret < 0)
+ return ret;
+
+ if (version_id >= 2) {
+ if (version_id == 2) {
+ uint8_t flags;
+ qemu_get_8s(f, &flags);
+ xen_platform_ioport_writeb(d, 0, flags);
+ }
+ qemu_get_be64(f);
+ }
+
+ return 0;
+}
+
+void pci_xen_platform_init(PCIBus *bus)
+{
+ PCIXenPlatformState *d;
+ struct pci_config_header *pch;
+
+ printf("Register xen platform.\n");
+ d = (PCIXenPlatformState *)pci_register_device(
+ bus, "xen-platform", sizeof(PCIXenPlatformState), -1, NULL, NULL);
+ pch = (struct pci_config_header *)d->pci_dev.config;
+ pch->vendor_id = 0x5853;
+ pch->device_id = 0x0001;
+ pch->command = 3; /* IO and memory access */
+ pch->revision = 1;
+ pch->api = 0;
+ pch->subclass = 0x80; /* Other */
+ pch->class = 0xff; /* Unclassified device class */
+ pch->header_type = 0;
+ pch->interrupt_pin = 1;
+
+ /* Microsoft WHQL requires non-zero subsystem IDs. */
+ /* http://www.pcisig.com/reflector/msg02205.html. */
+ pch->subsystem_vendor_id = pch->vendor_id; /* Duplicate vendor id. */
+ pch->subsystem_id = 0x0001; /* Hardcode sub-id as 1. */
+
+ pci_register_bar(&d->pci_dev, 0, 0x100,
+ PCI_BASE_ADDRESS_SPACE_IO, platform_ioport_map);
+
+ /* reserve 16MB mmio address for share memory*/
+ pci_register_bar(&d->pci_dev, 1, 0x1000000,
+ PCI_BASE_ADDRESS_MEM_PREFETCH, platform_mmio_map);
+
+ register_savevm(NULL, "platform", 0, 3, xen_pci_save, xen_pci_load, d);
+ printf("Done register platform.\n");
+}
+
diff --git a/hw/xen_platform.h b/hw/xen_platform.h
new file mode 100644
index 0000000..6eeff22
--- /dev/null
+++ b/hw/xen_platform.h
@@ -0,0 +1,9 @@
+#ifndef XEN_PLATFORM_H
+#define XEN_PLATFORM_H
+
+#include "hw/pci.h"
+
+void pci_xen_platform_init(PCIBus *bus);
+void platform_fixed_ioport_init(void);
+
+#endif
--
1.7.0.4
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