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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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55
hw/remote/proxy.c
View file

@ -17,6 +17,8 @@
#include "monitor/monitor.h"
#include "migration/blocker.h"
#include "qemu/sockets.h"
#include "hw/remote/mpqemu-link.h"
#include "qemu/error-report.h"
static void pci_proxy_dev_realize(PCIDevice *device, Error **errp)
{
@ -65,6 +67,56 @@ static void pci_proxy_dev_exit(PCIDevice *pdev)
error_free(dev->migration_blocker);
}
static void config_op_send(PCIProxyDev *pdev, uint32_t addr, uint32_t *val,
int len, unsigned int op)
{
MPQemuMsg msg = { 0 };
uint64_t ret = -EINVAL;
Error *local_err = NULL;
msg.cmd = op;
msg.data.pci_conf_data.addr = addr;
msg.data.pci_conf_data.val = (op == MPQEMU_CMD_PCI_CFGWRITE) ? *val : 0;
msg.data.pci_conf_data.len = len;
msg.size = sizeof(PciConfDataMsg);
ret = mpqemu_msg_send_and_await_reply(&msg, pdev, &local_err);
if (local_err) {
error_report_err(local_err);
}
if (ret == UINT64_MAX) {
error_report("Failed to perform PCI config %s operation",
(op == MPQEMU_CMD_PCI_CFGREAD) ? "READ" : "WRITE");
}
if (op == MPQEMU_CMD_PCI_CFGREAD) {
*val = (uint32_t)ret;
}
}
static uint32_t pci_proxy_read_config(PCIDevice *d, uint32_t addr, int len)
{
uint32_t val;
config_op_send(PCI_PROXY_DEV(d), addr, &val, len, MPQEMU_CMD_PCI_CFGREAD);
return val;
}
static void pci_proxy_write_config(PCIDevice *d, uint32_t addr, uint32_t val,
int len)
{
/*
* Some of the functions access the copy of remote device's PCI config
* space which is cached in the proxy device. Therefore, maintain
* it updated.
*/
pci_default_write_config(d, addr, val, len);
config_op_send(PCI_PROXY_DEV(d), addr, &val, len, MPQEMU_CMD_PCI_CFGWRITE);
}
static Property proxy_properties[] = {
DEFINE_PROP_STRING("fd", PCIProxyDev, fd),
DEFINE_PROP_END_OF_LIST(),
@ -77,6 +129,9 @@ static void pci_proxy_dev_class_init(ObjectClass *klass, void *data)
k->realize = pci_proxy_dev_realize;
k->exit = pci_proxy_dev_exit;
k->config_read = pci_proxy_read_config;
k->config_write = pci_proxy_write_config;
device_class_set_props(dc, proxy_properties);
}