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multi-process: perform device reset in the remote process 

Perform device reset in the remote process when QEMU performs
device reset. This is required to reset the internal state
(like registers, etc...) of emulated devices

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 7cb220a51f565dc0817bd76e2f540e89c2d2b850.1611938319.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Elena Ufimtseva 2021-01-29 11:46:21 -05:00 committed by Stefan Hajnoczi
parent 1bec145cd9
commit b6cc02d98f
3 changed files with 42 additions and 0 deletions
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22
hw/remote/message.c
View File

@ -19,6 +19,7 @@
#include "exec/memattrs.h"
#include "hw/remote/memory.h"
#include "hw/remote/iohub.h"
#include "sysemu/reset.h"
static void process_config_write(QIOChannel *ioc, PCIDevice *dev,
MPQemuMsg *msg, Error **errp);
@ -26,6 +27,8 @@ static void process_config_read(QIOChannel *ioc, PCIDevice *dev,
MPQemuMsg *msg, Error **errp);
static void process_bar_write(QIOChannel *ioc, MPQemuMsg *msg, Error **errp);
static void process_bar_read(QIOChannel *ioc, MPQemuMsg *msg, Error **errp);
static void process_device_reset_msg(QIOChannel *ioc, PCIDevice *dev,
Error **errp);
void coroutine_fn mpqemu_remote_msg_loop_co(void *data)
{
@ -69,6 +72,9 @@ void coroutine_fn mpqemu_remote_msg_loop_co(void *data)
case MPQEMU_CMD_SET_IRQFD:
process_set_irqfd_msg(pci_dev, &msg);
break;
case MPQEMU_CMD_DEVICE_RESET:
process_device_reset_msg(com->ioc, pci_dev, &local_err);
break;
default:
error_setg(&local_err,
"Unknown command (%d) received for device %s"
@ -206,3 +212,19 @@ fail:
getpid());
}
}
static void process_device_reset_msg(QIOChannel *ioc, PCIDevice *dev,
Error **errp)
{
DeviceClass *dc = DEVICE_GET_CLASS(dev);
DeviceState *s = DEVICE(dev);
MPQemuMsg ret = { 0 };
if (dc->reset) {
dc->reset(s);
}
ret.cmd = MPQEMU_CMD_RET;
mpqemu_msg_send(&ret, ioc, errp);
}

19
hw/remote/proxy.c
View File

@ -26,6 +26,7 @@
#include "util/event_notifier-posix.c"
static void probe_pci_info(PCIDevice *dev, Error **errp);
static void proxy_device_reset(DeviceState *dev);
static void proxy_intx_update(PCIDevice *pci_dev)
{
@ -202,6 +203,8 @@ static void pci_proxy_dev_class_init(ObjectClass *klass, void *data)
k->config_read = pci_proxy_read_config;
k->config_write = pci_proxy_write_config;
dc->reset = proxy_device_reset;
device_class_set_props(dc, proxy_properties);
}
@ -358,3 +361,19 @@ static void probe_pci_info(PCIDevice *dev, Error **errp)
}
}
}
static void proxy_device_reset(DeviceState *dev)
{
PCIProxyDev *pdev = PCI_PROXY_DEV(dev);
MPQemuMsg msg = { 0 };
Error *local_err = NULL;
msg.cmd = MPQEMU_CMD_DEVICE_RESET;
msg.size = 0;
mpqemu_msg_send_and_await_reply(&msg, pdev, &local_err);
if (local_err) {
error_report_err(local_err);
}
}

1
include/hw/remote/mpqemu-link.h
View File

@ -40,6 +40,7 @@ typedef enum {
MPQEMU_CMD_BAR_WRITE,
MPQEMU_CMD_BAR_READ,
MPQEMU_CMD_SET_IRQFD,
MPQEMU_CMD_DEVICE_RESET,
MPQEMU_CMD_MAX,
} MPQemuCmd;