On Thu, Jun 16, 2011 at 05:05:19PM +0100, stefano.stabellini@xxxxxxxxxxxxx
wrote:
> From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
>
> The unplug protocol is necessary to support PV drivers in the guest: the
> drivers expect to be able to "unplug" emulated disks and nics before
> initializing the Xen PV interfaces.
> It is responsibility of the guest to make sure that the unplug is done
> before the emulated devices or the PV interface start to be used.
>
> We use pci_for_each_device to walk the PCI bus, identify the devices and
> disks that we want to disable and dynamically unplug them.
>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> ---
> hw/xen_platform.c | 63
> ++++++++++++++++++++++++++++++++++++++++++++++++++++-
> 1 files changed, 62 insertions(+), 1 deletions(-)
>
> diff --git a/hw/xen_platform.c b/hw/xen_platform.c
> index b167eee..9f8c843 100644
> --- a/hw/xen_platform.c
> +++ b/hw/xen_platform.c
> @@ -34,6 +34,9 @@
> #include "xen_backend.h"
> #include "rwhandler.h"
> #include "trace.h"
> +#include "hw/ide/internal.h"
I'm not an expert here but it looks like
you should put some code in hw/ide/xen.c
and export an API from there rather
than calling ide_bus_reset and tweaking
PCIIDEState directly.
> +#include "hw/ide/pci.h"
> +#include "hw/pci_ids.h"
>
> #include <xenguest.h>
>
> @@ -76,6 +79,54 @@ static void log_writeb(PCIXenPlatformState *s, char val)
> }
>
> /* Xen Platform, Fixed IOPort */
> +#define UNPLUG_ALL_IDE_DISKS 1
> +#define UNPLUG_ALL_NICS 2
> +#define UNPLUG_AUX_IDE_DISKS 4
> +
> +static int unplug_param;
> +
> +static void unplug_nic(PCIBus *b, PCIDevice *d)
> +{
> + if (d->config[0xa] == 0 && d->config[0xb] == 2) {
Please use registers from pci_regs.h and pci_ids.h
> + pci_unplug_device(&(d->qdev));
Can't you use qdev_unplug?
That does other useful checks and updates system state.
Also, are there non hotpluggable devices?
If not you can assert on qdev_unplug failure.
> + }
> +}
> +
> +static void pci_unplug_nics(PCIBus *bus)
> +{
> + pci_for_each_device(bus, 0, unplug_nic);
> +}
> +
> +static void unplug_disks(PCIBus *b, PCIDevice *d)
> +{
> + if (d->config[0xa] == 1 && d->config[0xb] == 1) {
Same comment about hardcoded constants.
> + PCIIDEState *pci_ide = DO_UPCAST(PCIIDEState, dev, d);
> + DriveInfo *di;
> + int i = 0;
> +
> + if (unplug_param & UNPLUG_AUX_IDE_DISKS)
> + i++;
> +
> + for (; i < 3; i++) {
> + di = drive_get_by_index(IF_IDE, i);
> + if (di != NULL && di->bdrv != NULL && di->bdrv->type !=
> BDRV_TYPE_CDROM) {
line too long
> + DeviceState *ds = bdrv_get_attached(di->bdrv);
> + if (ds)
> + bdrv_detach(di->bdrv, ds);
> + bdrv_close(di->bdrv);
> + pci_ide->bus[di->bus].ifs[di->unit].bs = NULL;
> + drive_put_ref(di);
> + }
> + }
> + ide_bus_reset(&pci_ide->bus[0]);
> + ide_bus_reset(&pci_ide->bus[1]);
> + }
> +}
> +
> +static void pci_unplug_disks(PCIBus *bus)
> +{
> + pci_for_each_device(bus, 0, unplug_disks);
> +}
>
> static void platform_fixed_ioport_writew(void *opaque, uint32_t addr,
> uint32_t val)
> {
> @@ -83,10 +134,20 @@ static void platform_fixed_ioport_writew(void *opaque,
> uint32_t addr, uint32_t v
>
> switch (addr - XEN_PLATFORM_IOPORT) {
> case 0:
> - /* TODO: */
> + unplug_param = val;
> /* 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. */
> + if (val & UNPLUG_ALL_IDE_DISKS || val & UNPLUG_AUX_IDE_DISKS) {
> + DPRINTF("unplug disks\n");
> + qemu_aio_flush();
> + bdrv_flush_all();
> + pci_unplug_disks(s->pci_dev.bus);
> + }
> + if (val & UNPLUG_ALL_NICS) {
> + DPRINTF("unplug nics\n");
> + pci_unplug_nics(s->pci_dev.bus);
> + }
> break;
> case 2:
> switch (val) {
> --
> 1.7.2.3
>
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