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Annotation of qemu/target-ppc/kvm_ppc.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * PowerPC KVM support
                      3:  *
                      4:  * Copyright IBM Corp. 2008
                      5:  *
                      6:  * Authors:
                      7:  *  Hollis Blanchard <[email protected]>
                      8:  *
                      9:  * This work is licensed under the terms of the GNU GPL, version 2 or later.
                     10:  * See the COPYING file in the top-level directory.
                     11:  *
                     12:  */
                     13: 
                     14: #include "qemu-common.h"
                     15: #include "qemu-timer.h"
                     16: #include "kvm_ppc.h"
                     17: #include "device_tree.h"
                     18: 
                     19: #define PROC_DEVTREE_PATH "/proc/device-tree"
                     20: 
                     21: static QEMUTimer *kvmppc_timer;
                     22: static unsigned int kvmppc_timer_rate;
                     23: 
                     24: #ifdef HAVE_FDT
                     25: int kvmppc_read_host_property(const char *node_path, const char *prop,
                     26:                                      void *val, size_t len)
                     27: {
                     28:     char *path;
                     29:     FILE *f;
                     30:     int ret = 0;
                     31:     int pathlen;
                     32: 
                     33:     pathlen = snprintf(NULL, 0, "%s/%s/%s", PROC_DEVTREE_PATH, node_path, prop)
                     34:               + 1;
                     35:     path = qemu_malloc(pathlen);
                     36: 
                     37:     snprintf(path, pathlen, "%s/%s/%s", PROC_DEVTREE_PATH, node_path, prop);
                     38: 
                     39:     f = fopen(path, "rb");
                     40:     if (f == NULL) {
                     41:         ret = errno;
                     42:         goto free;
                     43:     }
                     44: 
                     45:     len = fread(val, len, 1, f);
                     46:     if (len != 1) {
                     47:         ret = ferror(f);
                     48:         goto close;
                     49:     }
                     50: 
                     51: close:
                     52:     fclose(f);
                     53: free:
                     54:     free(path);
                     55: out:
                     56:     return ret;
                     57: }
                     58: 
                     59: static int kvmppc_copy_host_cell(void *fdt, const char *node, const char *prop)
                     60: {
                     61:     uint32_t cell;
                     62:     int ret;
                     63: 
                     64:     ret = kvmppc_read_host_property(node, prop, &cell, sizeof(cell));
                     65:     if (ret < 0) {
                     66:         fprintf(stderr, "couldn't read host %s/%s\n", node, prop);
                     67:         goto out;
                     68:     }
                     69: 
                     70:     ret = qemu_devtree_setprop_cell(fdt, node, prop, cell);
                     71:     if (ret < 0) {
                     72:         fprintf(stderr, "couldn't set guest %s/%s\n", node, prop);
                     73:         goto out;
                     74:     }
                     75: 
                     76: out:
                     77:     return ret;
                     78: }
                     79: 
                     80: void kvmppc_fdt_update(void *fdt)
                     81: {
                     82:     /* Copy data from the host device tree into the guest. Since the guest can
                     83:      * directly access the timebase without host involvement, we must expose
                     84:      * the correct frequencies. */
                     85:     kvmppc_copy_host_cell(fdt, "/cpus/cpu@0", "clock-frequency");
                     86:     kvmppc_copy_host_cell(fdt, "/cpus/cpu@0", "timebase-frequency");
                     87: }
                     88: #endif
                     89: 
                     90: static void kvmppc_timer_hack(void *opaque)
                     91: {
                     92:     qemu_service_io();
                     93:     qemu_mod_timer(kvmppc_timer, qemu_get_clock(vm_clock) + kvmppc_timer_rate);
                     94: }
                     95: 
                     96: void kvmppc_init(void)
                     97: {
                     98:     /* XXX The only reason KVM yields control back to qemu is device IO. Since
                     99:      * an idle guest does no IO, qemu's device model will never get a chance to
                    100:      * run. So, until Qemu gains IO threads, we create this timer to ensure
                    101:      * that the device model gets a chance to run. */
                    102:     kvmppc_timer_rate = ticks_per_sec / 10;
                    103:     kvmppc_timer = qemu_new_timer(vm_clock, &kvmppc_timer_hack, NULL);
                    104:     qemu_mod_timer(kvmppc_timer, qemu_get_clock(vm_clock) + kvmppc_timer_rate);
                    105: }
                    106: 

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