0d0266a53b
Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6530 c046a42c-6fe2-441c-8c8c-71466251a162
107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/*
|
|
* PowerPC KVM support
|
|
*
|
|
* Copyright IBM Corp. 2008
|
|
*
|
|
* Authors:
|
|
* Hollis Blanchard <hollisb@us.ibm.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "qemu-common.h"
|
|
#include "qemu-timer.h"
|
|
#include "kvm_ppc.h"
|
|
#include "device_tree.h"
|
|
|
|
#define PROC_DEVTREE_PATH "/proc/device-tree"
|
|
|
|
static QEMUTimer *kvmppc_timer;
|
|
static unsigned int kvmppc_timer_rate;
|
|
|
|
#ifdef HAVE_FDT
|
|
int kvmppc_read_host_property(const char *node_path, const char *prop,
|
|
void *val, size_t len)
|
|
{
|
|
char *path;
|
|
FILE *f;
|
|
int ret = 0;
|
|
int pathlen;
|
|
|
|
pathlen = snprintf(NULL, 0, "%s/%s/%s", PROC_DEVTREE_PATH, node_path, prop)
|
|
+ 1;
|
|
path = qemu_malloc(pathlen);
|
|
|
|
snprintf(path, pathlen, "%s/%s/%s", PROC_DEVTREE_PATH, node_path, prop);
|
|
|
|
f = fopen(path, "rb");
|
|
if (f == NULL) {
|
|
ret = errno;
|
|
goto free;
|
|
}
|
|
|
|
len = fread(val, len, 1, f);
|
|
if (len != 1) {
|
|
ret = ferror(f);
|
|
goto close;
|
|
}
|
|
|
|
close:
|
|
fclose(f);
|
|
free:
|
|
free(path);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int kvmppc_copy_host_cell(void *fdt, const char *node, const char *prop)
|
|
{
|
|
uint32_t cell;
|
|
int ret;
|
|
|
|
ret = kvmppc_read_host_property(node, prop, &cell, sizeof(cell));
|
|
if (ret < 0) {
|
|
fprintf(stderr, "couldn't read host %s/%s\n", node, prop);
|
|
goto out;
|
|
}
|
|
|
|
ret = qemu_devtree_setprop_cell(fdt, node, prop, cell);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "couldn't set guest %s/%s\n", node, prop);
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void kvmppc_fdt_update(void *fdt)
|
|
{
|
|
/* Copy data from the host device tree into the guest. Since the guest can
|
|
* directly access the timebase without host involvement, we must expose
|
|
* the correct frequencies. */
|
|
kvmppc_copy_host_cell(fdt, "/cpus/cpu@0", "clock-frequency");
|
|
kvmppc_copy_host_cell(fdt, "/cpus/cpu@0", "timebase-frequency");
|
|
}
|
|
#endif
|
|
|
|
static void kvmppc_timer_hack(void *opaque)
|
|
{
|
|
qemu_service_io();
|
|
qemu_mod_timer(kvmppc_timer, qemu_get_clock(vm_clock) + kvmppc_timer_rate);
|
|
}
|
|
|
|
void kvmppc_init(void)
|
|
{
|
|
/* XXX The only reason KVM yields control back to qemu is device IO. Since
|
|
* an idle guest does no IO, qemu's device model will never get a chance to
|
|
* run. So, until Qemu gains IO threads, we create this timer to ensure
|
|
* that the device model gets a chance to run. */
|
|
kvmppc_timer_rate = ticks_per_sec / 10;
|
|
kvmppc_timer = qemu_new_timer(vm_clock, &kvmppc_timer_hack, NULL);
|
|
qemu_mod_timer(kvmppc_timer, qemu_get_clock(vm_clock) + kvmppc_timer_rate);
|
|
}
|
|
|