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multi-process: Forward PCI config space acceses to the remote process

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The Proxy Object sends the PCI config space accesses as messages
to the remote process over the communication channel

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: d3c94f4618813234655356c60e6f0d0362ff42d6.1611938319.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Elena Ufimtseva 2021-01-29 11:46:16 -05:00 • committed by Stefan Hajnoczi
parent e7b2c9eaa2
commit 11ab872588
4 changed files with 132 additions and 1 deletions
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60
hw/remote/message.c
View file

@ -15,6 +15,12 @@
#include "hw/remote/mpqemu-link.h"
#include "qapi/error.h"
#include "sysemu/runstate.h"
#include "hw/pci/pci.h"
static void process_config_write(QIOChannel *ioc, PCIDevice *dev,
MPQemuMsg *msg, Error **errp);
static void process_config_read(QIOChannel *ioc, PCIDevice *dev,
MPQemuMsg *msg, Error **errp);
void coroutine_fn mpqemu_remote_msg_loop_co(void *data)
{
@ -40,6 +46,12 @@ void coroutine_fn mpqemu_remote_msg_loop_co(void *data)
}
switch (msg.cmd) {
case MPQEMU_CMD_PCI_CFGWRITE:
process_config_write(com->ioc, pci_dev, &msg, &local_err);
break;
case MPQEMU_CMD_PCI_CFGREAD:
process_config_read(com->ioc, pci_dev, &msg, &local_err);
break;
default:
error_setg(&local_err,
"Unknown command (%d) received for device %s"
@ -55,3 +67,51 @@ void coroutine_fn mpqemu_remote_msg_loop_co(void *data)
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
}
}
static void process_config_write(QIOChannel *ioc, PCIDevice *dev,
MPQemuMsg *msg, Error **errp)
{
ERRP_GUARD();
PciConfDataMsg *conf = (PciConfDataMsg *)&msg->data.pci_conf_data;
MPQemuMsg ret = { 0 };
if ((conf->addr + sizeof(conf->val)) > pci_config_size(dev)) {
error_setg(errp, "Bad address for PCI config write, pid "FMT_pid".",
getpid());
ret.data.u64 = UINT64_MAX;
} else {
pci_default_write_config(dev, conf->addr, conf->val, conf->len);
}
ret.cmd = MPQEMU_CMD_RET;
ret.size = sizeof(ret.data.u64);
if (!mpqemu_msg_send(&ret, ioc, NULL)) {
error_prepend(errp, "Error returning code to proxy, pid "FMT_pid": ",
getpid());
}
}
static void process_config_read(QIOChannel *ioc, PCIDevice *dev,
MPQemuMsg *msg, Error **errp)
{
ERRP_GUARD();
PciConfDataMsg *conf = (PciConfDataMsg *)&msg->data.pci_conf_data;
MPQemuMsg ret = { 0 };
if ((conf->addr + sizeof(conf->val)) > pci_config_size(dev)) {
error_setg(errp, "Bad address for PCI config read, pid "FMT_pid".",
getpid());
ret.data.u64 = UINT64_MAX;
} else {
ret.data.u64 = pci_default_read_config(dev, conf->addr, conf->len);
}
ret.cmd = MPQEMU_CMD_RET;
ret.size = sizeof(ret.data.u64);
if (!mpqemu_msg_send(&ret, ioc, NULL)) {
error_prepend(errp, "Error returning code to proxy, pid "FMT_pid": ",
getpid());
}
}