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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: [Qemu-devel] [PATCH V6 06/15] xen: Add the Xen platform pci device
On 21.10.2010, at 19:36, Anthony.Perard@xxxxxxxxxx wrote:
> From: Steven Smith <ssmith@xxxxxxxxxxxxx>
>
> 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: Steven Smith <ssmith@xxxxxxxxxxxxx>
> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> ---
> Makefile.target | 1 +
> hw/hw.h | 3 +
> hw/pci_ids.h | 2 +
> hw/xen_machine_fv.c | 3 +
> hw/xen_platform.c | 431 +++++++++++++++++++++++++++++++++++++++++++++++++++
> hw/xen_platform.h | 8 +
> 6 files changed, 448 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 644cafa..db84edb 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -192,6 +192,7 @@ obj-$(CONFIG_NO_XEN) += xen-stub.o
>
> # xen full virtualized machine
> obj-i386-$(CONFIG_XEN) += xen_machine_fv.o
> +obj-i386-$(CONFIG_XEN) += xen_platform.o
>
> # USB layer
> obj-$(CONFIG_USB_OHCI) += usb-ohci.o
> diff --git a/hw/hw.h b/hw/hw.h
> index 4405092..67f3369 100644
> --- a/hw/hw.h
> +++ b/hw/hw.h
> @@ -653,6 +653,9 @@ extern const VMStateDescription vmstate_i2c_slave;
> #define VMSTATE_INT32_LE(_f, _s) \
> VMSTATE_SINGLE(_f, _s, 0, vmstate_info_int32_le, int32_t)
>
> +#define VMSTATE_UINT8_TEST(_f, _s, _t) \
> + VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_info_uint8, uint8_t)
> +
> #define VMSTATE_UINT16_TEST(_f, _s, _t) \
> VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_info_uint16, uint16_t)
>
> diff --git a/hw/pci_ids.h b/hw/pci_ids.h
> index 39e9f1d..1f2e0dd 100644
> --- a/hw/pci_ids.h
> +++ b/hw/pci_ids.h
> @@ -105,3 +105,5 @@
> #define PCI_DEVICE_ID_INTEL_82371AB 0x7111
> #define PCI_DEVICE_ID_INTEL_82371AB_2 0x7112
> #define PCI_DEVICE_ID_INTEL_82371AB_3 0x7113
> +
> +#define PCI_VENDOR_ID_XENSOURCE 0x5853
> diff --git a/hw/xen_machine_fv.c b/hw/xen_machine_fv.c
> index 260cda3..39ee7c7 100644
> --- a/hw/xen_machine_fv.c
> +++ b/hw/xen_machine_fv.c
> @@ -35,6 +35,7 @@
>
> #include "xen_common.h"
> #include "xen/hvm/hvm_info_table.h"
> +#include "xen_platform.h"
>
> #define MAX_IDE_BUS 2
>
> @@ -88,6 +89,8 @@ static void xen_init_fv(ram_addr_t ram_size,
>
> pc_vga_init(pci_bus);
>
> + pci_xen_platform_init(pci_bus);
> +
> /* 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..7551c81
> --- /dev/null
> +++ b/hw/xen_platform.c
> @@ -0,0 +1,431 @@
> +/*
> + * 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 "rwhandler.h"
> +
> +#include <assert.h>
> +#include <xenguest.h>
> +
> +//#define DEBUG_PLATFORM
> +
> +#ifdef DEBUG_PLATFORM
> +#define DPRINTF(fmt, ...) do { \
> + fprintf(stderr, "xen_platform: " fmt, ## __VA_ARGS__); \
> +} while (0)
> +#else
> +#define DPRINTF(fmt, ...) do { } while (0)
> +#endif
> +
> +#define PFFLAG_ROM_LOCK 1 /* Sets whether ROM memory area is RW or RO */
> +
> +typedef struct PCIXenPlatformState {
> + PCIDevice pci_dev;
> + uint8_t flags; /* used only for version_id == 2 */
> + int drivers_blacklisted;
> + uint16_t driver_product_version;
> +
> + /* Log from guest drivers */
> + int throttling_disabled;
> + char log_buffer[4096];
> + int log_buffer_off;
> +} PCIXenPlatformState;
> +
> +#define XEN_PLATFORM_IOPORT 0x10
> +
> +/* 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(PCIXenPlatformState *s, unsigned count)
> +{
> + static unsigned available;
> + static int64_t last_refill;
> + static int started;
> + static int warned;
> +
> + int64_t waiting_for, now;
> + int64_t delay;
> +
> + if (s->throttling_disabled) {
> + return;
> + }
> +
> + if (!started) {
> + last_refill = qemu_get_clock_ns(rt_clock);
> + available = BUCKET_MAX_SIZE;
> + started = 1;
> + }
> +
> + if (count > BUCKET_MAX_SIZE) {
> + DPRINTF("tried to get %u tokens, but bucket size is %u\n",
> + BUCKET_MAX_SIZE, count);
> + exit(1);
> + }
> +
> + if (available < count) {
> + /* The bucket is empty. Refill it */
> +
> + /* When will it be full enough to handle this request? */
> + delay = muldiv64(count - available, 1000000000, BUCKET_FILL_RATE);
> +
> + waiting_for = last_refill + delay;
> +
> + /* How long do we have to wait? (might be negative) */
> + waiting_for = waiting_for - qemu_get_clock_ns(rt_clock);
> +
> + /* Wait for it. */
> + if (waiting_for > 0) {
> + struct timespec ts;
> + if (!warned) {
> + DPRINTF("throttling guest access to syslog");
> + warned = 1;
> + }
> + ts.tv_sec = waiting_for / 1000000000;
> + ts.tv_nsec = waiting_for % 1000000000;
> + while (nanosleep(&ts, &ts) < 0 && errno == EINTR) {
> + }
> + }
> +
> + /* Refill */
> + now = qemu_get_clock_ns(rt_clock);
> + available += muldiv64(now - last_refill,
> + BUCKET_FILL_RATE,
> + 1000000000);
> + if (available > BUCKET_MAX_SIZE) {
> + available = BUCKET_MAX_SIZE;
> + }
> + last_refill = now;
> + }
> +
> + assert(available >= count);
> +
> + available -= count;
> +}
> +
> +/* Xen Platform, Fixed IOPort */
> +
> +static void platform_fixed_ioport_writew(void *opaque, uint32_t addr,
> uint32_t val)
> +{
> + PCIXenPlatformState *s = opaque;
> +
> + switch (addr - XEN_PLATFORM_IOPORT) {
> + case 0:
> + /* TODO: */
> + /* 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:
> + DPRINTF("Citrix Windows PV drivers loaded in guest\n");
> + break;
> + case 0:
> + DPRINTF("Guest claimed to be running PV product 0?\n");
> + break;
> + default:
> + DPRINTF("Unknown PV product %d loaded in guest\n", val);
> + break;
> + }
> + s->driver_product_version = val;
> + break;
> + }
> +}
> +
> +static void platform_fixed_ioport_writel(void *opaque, uint32_t addr,
> + uint32_t val)
> +{
> + switch (addr - XEN_PLATFORM_IOPORT) {
> + case 0:
> + /* PV driver version */
> + break;
> + }
> +}
> +
> +static void platform_fixed_ioport_writeb(void *opaque, uint32_t addr,
> uint32_t val)
> +{
> + PCIXenPlatformState *s = opaque;
> +
> + switch (addr - XEN_PLATFORM_IOPORT) {
> + 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)) {
> + DPRINTF("unable to change ro/rw state of ROM memory area!\n");
> + } else {
> + s->flags = val & PFFLAG_ROM_LOCK;
> + DPRINTF("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' || s->log_buffer_off == sizeof(s->log_buffer) - 1) {
> + /* Flush buffer */
> + s->log_buffer[s->log_buffer_off] = 0;
> + throttle(s, s->log_buffer_off);
> + DPRINTF("%s\n", s->log_buffer);
> + s->log_buffer_off = 0;
> + break;
> + }
> + s->log_buffer[s->log_buffer_off++] = val;
^^
> + break;
> + }
> +}
> +
> +static uint32_t platform_fixed_ioport_readw(void *opaque, uint32_t addr)
> +{
> + PCIXenPlatformState *s = opaque;
> +
> + switch (addr - XEN_PLATFORM_IOPORT) {
> + case 0:
> + if (s->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_readb(void *opaque, uint32_t addr)
> +{
> + PCIXenPlatformState *s = opaque;
> +
> + switch (addr - XEN_PLATFORM_IOPORT) {
> + case 0:
> + /* Platform flags */
> + return s->flags;
> + case 2:
> + /* Version number */
> + return 1;
> + default:
> + return 0xff;
> + }
> +}
> +
> +static void platform_fixed_ioport_reset(void *opaque)
> +{
> + PCIXenPlatformState *s = opaque;
> +
> + platform_fixed_ioport_writeb(s, XEN_PLATFORM_IOPORT, 0);
> +}
> +
> +static void platform_fixed_ioport_init(PCIXenPlatformState* s)
> +{
> + register_ioport_write(XEN_PLATFORM_IOPORT, 16, 4,
> platform_fixed_ioport_writel, s);
> + register_ioport_write(XEN_PLATFORM_IOPORT, 16, 2,
> platform_fixed_ioport_writew, s);
> + register_ioport_write(XEN_PLATFORM_IOPORT, 16, 1,
> platform_fixed_ioport_writeb, s);
> + register_ioport_read(XEN_PLATFORM_IOPORT, 16, 2,
> platform_fixed_ioport_readw, s);
> + register_ioport_read(XEN_PLATFORM_IOPORT, 16, 1,
> platform_fixed_ioport_readb, s);
> +}
> +
> +/* Xen Platform PCI Device */
> +
> +static uint32_t xen_platform_ioport_readb(void *opaque, uint32_t addr)
> +{
> + addr &= 0xff;
> +
> + if (addr == 0) {
> + return platform_fixed_ioport_readb(opaque, XEN_PLATFORM_IOPORT);
> + } else {
> + return ~0u;
> + }
> +}
> +
> +static void xen_platform_ioport_writeb(void *opaque, uint32_t addr, uint32_t
> val)
> +{
> + PCIXenPlatformState *s = opaque;
> +
> + addr &= 0xff;
> + val &= 0xff;
> +
> + switch (addr) {
> + case 0: /* Platform flags */
> + platform_fixed_ioport_writeb(opaque, XEN_PLATFORM_IOPORT, val);
> + break;
> + case 8:
> + {
> + if (val == '\n' || s->log_buffer_off == sizeof(s->log_buffer) -
> 1) {
> + /* Flush buffer */
> + s->log_buffer[s->log_buffer_off] = 0;
> + throttle(s, s->log_buffer_off);
> + DPRINTF("%s\n", s->log_buffer);
> + s->log_buffer_off = 0;
> + break;
> + }
> + s->log_buffer[s->log_buffer_off++] = val;
Isn't this duplicate code to the log case above? Please combine the two if it
makes sense :).
Alex
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