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