On Thu, 30 Jun 2011, Alexander Graf wrote:
> On 06/29/2011 01:12 PM, stefano.stabellini@xxxxxxxxxxxxx wrote:
> > From: Stefano Stabellini<stefano.stabellini@xxxxxxxxxxxxx>
> >
> > Since CS 21994 on xen-unstable.hg and CS
> > 466608f3a32e1f9808acdf832a5843af37e5fcec on qemu-xen-unstable.git, few
> > changes have been introduced to the PV console xenstore protocol, as
> > described by the document docs/misc/console.txt under xen-unstable.hg.
> >
> > From the Qemu point of view, very few modifications are needed to
> > correctly support the protocol: read from xenstore the "output" node
> > that tell us what the output of the PV console is going to be.
> > In case the output is a tty, write to xenstore the device name.
> >
> > Changes in v2:
> >
> > - fix error paths: free malloc'ed strings and close the xenstore
> > connection before returning;
> >
> > - remove useless snprintf in xenstore_store_pv_console_info if i == 0.
> >
> > Changes in v3:
> >
> > - replace xs_daemon_open/xs_daemon_close with xs_open/xs_close.
> >
> > Signed-off-by: Stefano Stabellini<stefano.stabellini@xxxxxxxxxxxxx>
> > ---
> > hw/xen.h | 1 +
> > hw/xen_console.c | 16 +++++++++-----
> > xen-all.c | 60
> > ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 71 insertions(+), 6 deletions(-)
> >
> > diff --git a/hw/xen.h b/hw/xen.h
> > index d435ca0..dad0ca0 100644
> > --- a/hw/xen.h
> > +++ b/hw/xen.h
> > @@ -50,6 +50,7 @@ qemu_irq *xen_interrupt_controller_init(void);
> > int xen_init(void);
> > int xen_hvm_init(void);
> > void xen_vcpu_init(void);
> > +void xenstore_store_pv_console_info(int i, struct CharDriverState *chr);
> >
> > #if defined(NEED_CPU_H)&& !defined(CONFIG_USER_ONLY)
> > void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size);
> > diff --git a/hw/xen_console.c b/hw/xen_console.c
> > index 519d5f5..e81afcd 100644
> > --- a/hw/xen_console.c
> > +++ b/hw/xen_console.c
> > @@ -179,8 +179,9 @@ static void xencons_send(struct XenConsole *con)
> > static int con_init(struct XenDevice *xendev)
> > {
> > struct XenConsole *con = container_of(xendev, struct XenConsole,
> > xendev);
> > - char *type, *dom;
> > + char *type, *dom, label[32];
> > int ret = 0;
> > + const char *output;
> >
> > /* setup */
> > dom = xs_get_domain_path(xenstore, con->xendev.dom);
> > @@ -194,11 +195,14 @@ static int con_init(struct XenDevice *xendev)
> > goto out;
> > }
> >
> > - if (!serial_hds[con->xendev.dev])
> > - xen_be_printf(xendev, 1, "WARNING: serial line %d not configured\n",
> > - con->xendev.dev);
> > - else
> > - con->chr = serial_hds[con->xendev.dev];
> > + output = xenstore_read_str(con->console, "output");
> > + /* output is a pty by default */
> > + if (output == NULL) {
> > + output = "pty";
>
> Not sure I understand. Why would a pty be the default? stdio makes a lot
> more sense, no?
ptys are always been the default in the xen world. Besides qemu is
always executed by the toolstack, so stdio might be used for something
else...
> > + }
> > + snprintf(label, sizeof(label), "xencons%d", con->xendev.dev);
> > + con->chr = qemu_chr_open(label, output, NULL);
> > + xenstore_store_pv_console_info(con->xendev.dev, con->chr);
> >
> > out:
> > qemu_free(type);
> > diff --git a/xen-all.c b/xen-all.c
> > index 6099bff..3fd04ef 100644
> > --- a/xen-all.c
> > +++ b/xen-all.c
> > @@ -737,6 +737,66 @@ static void cpu_handle_ioreq(void *opaque)
> > }
> > }
> >
> > +static int store_dev_info(int domid, CharDriverState *cs, const char
> > *string)
> > +{
> > + struct xs_handle *xs = NULL;
> > + char *path = NULL;
> > + char *newpath = NULL;
> > + char *pts = NULL;
> > + int ret = -1;
> > +
> > + /* Only continue if we're talking to a pty. */
> > + if (strncmp(cs->filename, "pty:", 4)) {
>
> What's wrong with !pty?
Nothing wrong, we don't need to write anything back to xenstore in that
case.
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