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hvc_xen: support PV on HVM consoles

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Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Stefano Stabellini 2012-01-27 18:31:36 +00:00 committed by Konrad Rzeszutek Wilk
parent bd0d5aa417
commit eb5ef07151
2 changed files with 73 additions and 17 deletions
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84
drivers/tty/hvc/hvc_xen.c
View File

@ -24,9 +24,12 @@
#include <linux/init.h>
#include <linux/types.h>
#include <asm/io.h>
#include <asm/xen/hypervisor.h>
#include <xen/xen.h>
#include <xen/interface/xen.h>
#include <xen/hvm.h>
#include <xen/page.h>
#include <xen/events.h>
#include <xen/interface/io/console.h>
@ -42,9 +45,13 @@ static int xencons_irq;
/* ------------------------------------------------------------------ */
static unsigned long console_pfn = ~0ul;
static unsigned int console_evtchn = ~0ul;
static struct xencons_interface *xencons_if = NULL;
static inline struct xencons_interface *xencons_interface(void)
{
if (xencons_if != NULL)
return xencons_if;
if (console_pfn == ~0ul)
return mfn_to_virt(xen_start_info->console.domU.mfn);
else
@ -54,7 +61,10 @@ static inline struct xencons_interface *xencons_interface(void)
static inline void notify_daemon(void)
{
/* Use evtchn: this is called early, before irq is set up. */
notify_remote_via_evtchn(xen_start_info->console.domU.evtchn);
if (console_evtchn == ~0ul)
notify_remote_via_evtchn(xen_start_info->console.domU.evtchn);
else
notify_remote_via_evtchn(console_evtchn);
}
static int __write_console(const char *data, int len)
@ -157,28 +167,63 @@ static struct hv_ops dom0_hvc_ops = {
.notifier_hangup = notifier_hangup_irq,
};
static int xen_hvm_console_init(void)
{
int r;
uint64_t v = 0;
unsigned long mfn;
if (!xen_hvm_domain())
return -ENODEV;
if (xencons_if != NULL)
return -EBUSY;
r = hvm_get_parameter(HVM_PARAM_CONSOLE_EVTCHN, &v);
if (r < 0)
return -ENODEV;
console_evtchn = v;
hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v);
if (r < 0)
return -ENODEV;
mfn = v;
xencons_if = ioremap(mfn << PAGE_SHIFT, PAGE_SIZE);
if (xencons_if == NULL)
return -ENODEV;
return 0;
}
static int __init xen_hvc_init(void)
{
struct hvc_struct *hp;
struct hv_ops *ops;
int r;
if (!xen_pv_domain())
if (!xen_domain())
return -ENODEV;
if (xen_initial_domain()) {
ops = &dom0_hvc_ops;
xencons_irq = bind_virq_to_irq(VIRQ_CONSOLE, 0);
} else {
if (!xen_start_info->console.domU.evtchn)
return -ENODEV;
ops = &domU_hvc_ops;
xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn);
if (xen_pv_domain()) {
if (!xen_start_info->console.domU.evtchn)
return -ENODEV;
console_pfn = mfn_to_pfn(xen_start_info->console.domU.mfn);
console_evtchn = xen_start_info->console.domU.evtchn;
} else {
r = xen_hvm_console_init();
if (r < 0)
return r;
}
xencons_irq = bind_evtchn_to_irq(console_evtchn);
if (xencons_irq < 0)
xencons_irq = 0; /* NO_IRQ */
else
irq_set_noprobe(xencons_irq);
}
if (xencons_irq < 0)
xencons_irq = 0; /* NO_IRQ */
else
irq_set_noprobe(xencons_irq);
hp = hvc_alloc(HVC_COOKIE, xencons_irq, ops, 256);
if (IS_ERR(hp))
@ -186,15 +231,13 @@ static int __init xen_hvc_init(void)
hvc = hp;
console_pfn = mfn_to_pfn(xen_start_info->console.domU.mfn);
return 0;
}
void xen_console_resume(void)
{
if (xencons_irq)
rebind_evtchn_irq(xen_start_info->console.domU.evtchn, xencons_irq);
rebind_evtchn_irq(console_evtchn, xencons_irq);
}
static void __exit xen_hvc_fini(void)
@ -205,16 +248,22 @@ static void __exit xen_hvc_fini(void)
static int xen_cons_init(void)
{
struct hv_ops *ops;
const struct hv_ops *ops;
if (!xen_pv_domain())
if (!xen_domain())
return 0;
if (xen_initial_domain())
ops = &dom0_hvc_ops;
else
else {
ops = &domU_hvc_ops;
if (xen_pv_domain())
console_evtchn = xen_start_info->console.domU.evtchn;
else
xen_hvm_console_init();
}
hvc_instantiate(HVC_COOKIE, 0, ops);
return 0;
}
@ -230,6 +279,9 @@ static void xenboot_write_console(struct console *console, const char *string,
unsigned int linelen, off = 0;
const char *pos;
if (!xen_pv_domain())
return;
dom0_write_console(0, string, len);
if (xen_initial_domain())

6
include/xen/interface/hvm/params.h
View File

@ -90,6 +90,10 @@
/* Boolean: Enable aligning all periodic vpts to reduce interrupts */
#define HVM_PARAM_VPT_ALIGN 16
#define HVM_NR_PARAMS 17
/* Console debug shared memory ring and event channel */
#define HVM_PARAM_CONSOLE_PFN 17
#define HVM_PARAM_CONSOLE_EVTCHN 18
#define HVM_NR_PARAMS 19
#endif /* __XEN_PUBLIC_HVM_PARAMS_H__ */