diff options
Diffstat (limited to 'hw/char/xen_console.c')
| -rw-r--r-- | hw/char/xen_console.c | 78 |
1 files changed, 58 insertions, 20 deletions
diff --git a/hw/char/xen_console.c b/hw/char/xen_console.c index 4a419dc287..5cbee2f184 100644 --- a/hw/char/xen_console.c +++ b/hw/char/xen_console.c @@ -33,6 +33,8 @@ #include "hw/qdev-properties-system.h" #include "hw/xen/interface/io/console.h" #include "hw/xen/interface/io/xs_wire.h" +#include "hw/xen/interface/grant_table.h" +#include "hw/i386/kvm/xen_primary_console.h" #include "trace.h" struct buffer { @@ -230,24 +232,47 @@ static bool xen_console_connect(XenDevice *xendev, Error **errp) return false; } - if (!con->dev) { - xen_pfn_t mfn = (xen_pfn_t)con->ring_ref; - con->sring = qemu_xen_foreignmem_map(xendev->frontend_id, NULL, - PROT_READ | PROT_WRITE, - 1, &mfn, NULL); - if (!con->sring) { - error_setg(errp, "failed to map console page"); - return false; + switch (con->dev) { + case 0: + /* + * The primary console is special. For real Xen the ring-ref is + * actually a GFN which needs to be mapped as foreignmem. + */ + if (xen_mode != XEN_EMULATE) { + xen_pfn_t mfn = (xen_pfn_t)con->ring_ref; + con->sring = qemu_xen_foreignmem_map(xendev->frontend_id, NULL, + PROT_READ | PROT_WRITE, + 1, &mfn, NULL); + if (!con->sring) { + error_setg(errp, "failed to map console page"); + return false; + } + break; } - } else { + + /* + * For Xen emulation, we still follow the convention of ring-ref + * holding the GFN, but we map the fixed GNTTAB_RESERVED_CONSOLE + * grant ref because there is no implementation of foreignmem + * operations for emulated mode. The emulation code which handles + * the guest-side page and event channel also needs to be informed + * of the backend event channel port, in order to reconnect to it + * after a soft reset. + */ + xen_primary_console_set_be_port( + xen_event_channel_get_local_port(con->event_channel)); + con->ring_ref = GNTTAB_RESERVED_CONSOLE; + /* fallthrough */ + default: con->sring = xen_device_map_grant_refs(xendev, &con->ring_ref, 1, PROT_READ | PROT_WRITE, errp); if (!con->sring) { - error_prepend(errp, "failed to map grant ref: "); + error_prepend(errp, "failed to map console grant ref: "); return false; } + break; } trace_xen_console_connect(con->dev, con->ring_ref, port, @@ -272,10 +297,14 @@ static void xen_console_disconnect(XenDevice *xendev, Error **errp) xen_device_unbind_event_channel(xendev, con->event_channel, errp); con->event_channel = NULL; + + if (xen_mode == XEN_EMULATE && !con->dev) { + xen_primary_console_set_be_port(0); + } } if (con->sring) { - if (!con->dev) { + if (!con->dev && xen_mode != XEN_EMULATE) { qemu_xen_foreignmem_unmap(con->sring, 1); } else { xen_device_unmap_grant_refs(xendev, con->sring, @@ -338,14 +367,19 @@ static char *xen_console_get_name(XenDevice *xendev, Error **errp) if (con->dev == -1) { XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); char fe_path[XENSTORE_ABS_PATH_MAX + 1]; + int idx = (xen_mode == XEN_EMULATE) ? 0 : 1; char *value; - int idx = 1; /* Theoretically we could go up to INT_MAX here but that's overkill */ while (idx < 100) { - snprintf(fe_path, sizeof(fe_path), - "/local/domain/%u/device/console/%u", - xendev->frontend_id, idx); + if (!idx) { + snprintf(fe_path, sizeof(fe_path), + "/local/domain/%u/console", xendev->frontend_id); + } else { + snprintf(fe_path, sizeof(fe_path), + "/local/domain/%u/device/console/%u", + xendev->frontend_id, idx); + } value = qemu_xen_xs_read(xenbus->xsh, XBT_NULL, fe_path, NULL); if (!value) { if (errno == ENOENT) { @@ -400,11 +434,15 @@ static void xen_console_realize(XenDevice *xendev, Error **errp) * be mapped directly as foreignmem (not a grant ref), and the guest port * was allocated *for* the guest by the toolstack. The guest gets these * through HVMOP_get_param and can use the console long before it's got - * XenStore up and running. We cannot create those for a Xen guest. + * XenStore up and running. We cannot create those for a true Xen guest, + * but we can for Xen emulation. */ if (!con->dev) { - if (xen_device_frontend_scanf(xendev, "ring-ref", "%u", &u) != 1 || - xen_device_frontend_scanf(xendev, "port", "%u", &u) != 1) { + if (xen_mode == XEN_EMULATE) { + xen_primary_console_create(); + } else if (xen_device_frontend_scanf(xendev, "ring-ref", "%u", &u) + != 1 || + xen_device_frontend_scanf(xendev, "port", "%u", &u) != 1) { error_setg(errp, "cannot create primary Xen console"); return; } @@ -417,8 +455,8 @@ static void xen_console_realize(XenDevice *xendev, Error **errp) xen_device_frontend_printf(xendev, "tty", "%s", cs->filename + 4); } - /* No normal PV driver initialization for the primary console */ - if (!con->dev) { + /* No normal PV driver initialization for the primary console under Xen */ + if (!con->dev && xen_mode != XEN_EMULATE) { xen_console_connect(xendev, errp); } } |