cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

sclpcpu.c (2668B)

      1/*
      2 * SCLP event type
      3 *    Signal CPU - Trigger SCLP interrupt for system CPU configure or
      4 *    de-configure
      5 *
      6 * Copyright IBM, Corp. 2013
      7 *
      8 * Authors:
      9 *  Thang Pham <thang.pham@us.ibm.com>
     10 *
     11 * This work is licensed under the terms of the GNU GPL, version 2 or (at your
     12 * option) any later version.  See the COPYING file in the top-level directory.
     13 *
     14 */
     15
     16#include "qemu/osdep.h"
     17#include "hw/s390x/sclp.h"
     18#include "qemu/module.h"
     19#include "hw/s390x/event-facility.h"
     20#include "sysemu/cpus.h"
     21
     22typedef struct ConfigMgtData {
     23    EventBufferHeader ebh;
     24    uint8_t reserved;
     25    uint8_t event_qualifier;
     26} QEMU_PACKED ConfigMgtData;
     27
     28#define EVENT_QUAL_CPU_CHANGE  1
     29
     30void raise_irq_cpu_hotplug(void)
     31{
     32    Object *obj = object_resolve_path_type("", TYPE_SCLP_CPU_HOTPLUG, NULL);
     33
     34    SCLP_EVENT(obj)->event_pending = true;
     35
     36    /* Trigger SCLP read operation */
     37    sclp_service_interrupt(0);
     38}
     39
     40static sccb_mask_t send_mask(void)
     41{
     42    return SCLP_EVENT_MASK_CONFIG_MGT_DATA;
     43}
     44
     45static sccb_mask_t receive_mask(void)
     46{
     47    return 0;
     48}
     49
     50static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
     51                           int *slen)
     52{
     53    ConfigMgtData *cdata = (ConfigMgtData *) evt_buf_hdr;
     54    if (*slen < sizeof(ConfigMgtData)) {
     55        return 0;
     56    }
     57
     58    /* Event is no longer pending */
     59    if (!event->event_pending) {
     60        return 0;
     61    }
     62    event->event_pending = false;
     63
     64    /* Event header data */
     65    cdata->ebh.length = cpu_to_be16(sizeof(ConfigMgtData));
     66    cdata->ebh.type = SCLP_EVENT_CONFIG_MGT_DATA;
     67    cdata->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
     68
     69    /* Trigger a rescan of CPUs by setting event qualifier */
     70    cdata->event_qualifier = EVENT_QUAL_CPU_CHANGE;
     71    *slen -= sizeof(ConfigMgtData);
     72
     73    return 1;
     74}
     75
     76static void cpu_class_init(ObjectClass *oc, void *data)
     77{
     78    SCLPEventClass *k = SCLP_EVENT_CLASS(oc);
     79    DeviceClass *dc = DEVICE_CLASS(oc);
     80
     81    k->get_send_mask = send_mask;
     82    k->get_receive_mask = receive_mask;
     83    k->read_event_data = read_event_data;
     84    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
     85    /*
     86     * Reason: raise_irq_cpu_hotplug() depends on an unique
     87     * TYPE_SCLP_CPU_HOTPLUG device, which is already created
     88     * by the sclp event facility
     89     */
     90    dc->user_creatable = false;
     91}
     92
     93static const TypeInfo sclp_cpu_info = {
     94    .name          = TYPE_SCLP_CPU_HOTPLUG,
     95    .parent        = TYPE_SCLP_EVENT,
     96    .instance_size = sizeof(SCLPEvent),
     97    .class_init    = cpu_class_init,
     98    .class_size    = sizeof(SCLPEventClass),
     99};
    100
    101static void sclp_cpu_register_types(void)
    102{
    103    type_register_static(&sclp_cpu_info);
    104}
    105
    106type_init(sclp_cpu_register_types)