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/*
* Copyright © 2018, 2021 Oracle and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qemu/compiler.h"
#include "qemu/int128.h"
#include "qemu/range.h"
#include "exec/memory.h"
#include "exec/cpu-common.h"
#include "exec/ram_addr.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "hw/remote/mpqemu-link.h"
#include "hw/remote/proxy-memory-listener.h"
/*
* TODO: get_fd_from_hostaddr(), proxy_mrs_can_merge() and
* proxy_memory_listener_commit() defined below perform tasks similar to the
* functions defined in vhost-user.c. These functions are good candidates
* for refactoring.
*
*/
static void proxy_memory_listener_reset(MemoryListener *listener)
{
ProxyMemoryListener *proxy_listener = container_of(listener,
ProxyMemoryListener,
listener);
int mrs;
for (mrs = 0; mrs < proxy_listener->n_mr_sections; mrs++) {
memory_region_unref(proxy_listener->mr_sections[mrs].mr);
}
g_free(proxy_listener->mr_sections);
proxy_listener->mr_sections = NULL;
proxy_listener->n_mr_sections = 0;
}
static int get_fd_from_hostaddr(uint64_t host, ram_addr_t *offset)
{
MemoryRegion *mr;
ram_addr_t off;
/**
* Assumes that the host address is a valid address as it's
* coming from the MemoryListener system. In the case host
* address is not valid, the following call would return
* the default subregion of "system_memory" region, and
* not NULL. So it's not possible to check for NULL here.
*/
mr = memory_region_from_host((void *)(uintptr_t)host, &off);
if (offset) {
*offset = off;
}
return memory_region_get_fd(mr);
}
static bool proxy_mrs_can_merge(uint64_t host, uint64_t prev_host, size_t size)
{
if (((prev_host + size) != host)) {
return false;
}
if (get_fd_from_hostaddr(host, NULL) !=
get_fd_from_hostaddr(prev_host, NULL)) {
return false;
}
return true;
}
static bool try_merge(ProxyMemoryListener *proxy_listener,
MemoryRegionSection *section)
{
uint64_t mrs_size, mrs_gpa, mrs_page;
MemoryRegionSection *prev_sec;
bool merged = false;
uintptr_t mrs_host;
RAMBlock *mrs_rb;
if (!proxy_listener->n_mr_sections) {
return false;
}
mrs_rb = section->mr->ram_block;
mrs_page = (uint64_t)qemu_ram_pagesize(mrs_rb);
mrs_size = int128_get64(section->size);
mrs_gpa = section->offset_within_address_space;
mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) +
section->offset_within_region;
if (get_fd_from_hostaddr(mrs_host, NULL) < 0) {
return true;
}
mrs_host = mrs_host & ~(mrs_page - 1);
mrs_gpa = mrs_gpa & ~(mrs_page - 1);
mrs_size = ROUND_UP(mrs_size, mrs_page);
prev_sec = proxy_listener->mr_sections +
(proxy_listener->n_mr_sections - 1);
uint64_t prev_gpa_start = prev_sec->offset_within_address_space;
uint64_t prev_size = int128_get64(prev_sec->size);
uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size);
uint64_t prev_host_start =
(uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) +
prev_sec->offset_within_region;
uint64_t prev_host_end = range_get_last(prev_host_start, prev_size);
if (mrs_gpa <= (prev_gpa_end + 1)) {
g_assert(mrs_gpa > prev_gpa_start);
if ((section->mr == prev_sec->mr) &&
proxy_mrs_can_merge(mrs_host, prev_host_start,
(mrs_gpa - prev_gpa_start))) {
uint64_t max_end = MAX(prev_host_end, mrs_host + mrs_size);
merged = true;
prev_sec->offset_within_address_space =
MIN(prev_gpa_start, mrs_gpa);
prev_sec->offset_within_region =
MIN(prev_host_start, mrs_host) -
(uintptr_t)memory_region_get_ram_ptr(prev_sec->mr);
prev_sec->size = int128_make64(max_end - MIN(prev_host_start,
mrs_host));
}
}
return merged;
}
static void proxy_memory_listener_region_addnop(MemoryListener *listener,
MemoryRegionSection *section)
{
ProxyMemoryListener *proxy_listener = container_of(listener,
ProxyMemoryListener,
listener);
if (!memory_region_is_ram(section->mr) ||
memory_region_is_rom(section->mr)) {
return;
}
if (try_merge(proxy_listener, section)) {
return;
}
++proxy_listener->n_mr_sections;
proxy_listener->mr_sections = g_renew(MemoryRegionSection,
proxy_listener->mr_sections,
proxy_listener->n_mr_sections);
proxy_listener->mr_sections[proxy_listener->n_mr_sections - 1] = *section;
proxy_listener->mr_sections[proxy_listener->n_mr_sections - 1].fv = NULL;
memory_region_ref(section->mr);
}
static void proxy_memory_listener_commit(MemoryListener *listener)
{
ProxyMemoryListener *proxy_listener = container_of(listener,
ProxyMemoryListener,
listener);
MPQemuMsg msg;
MemoryRegionSection *section;
ram_addr_t offset;
uintptr_t host_addr;
int region;
Error *local_err = NULL;
memset(&msg, 0, sizeof(MPQemuMsg));
msg.cmd = MPQEMU_CMD_SYNC_SYSMEM;
msg.num_fds = proxy_listener->n_mr_sections;
msg.size = sizeof(SyncSysmemMsg);
if (msg.num_fds > REMOTE_MAX_FDS) {
error_report("Number of fds is more than %d", REMOTE_MAX_FDS);
return;
}
for (region = 0; region < proxy_listener->n_mr_sections; region++) {
section = &proxy_listener->mr_sections[region];
msg.data.sync_sysmem.gpas[region] =
section->offset_within_address_space;
msg.data.sync_sysmem.sizes[region] = int128_get64(section->size);
host_addr = (uintptr_t)memory_region_get_ram_ptr(section->mr) +
section->offset_within_region;
msg.fds[region] = get_fd_from_hostaddr(host_addr, &offset);
msg.data.sync_sysmem.offsets[region] = offset;
}
if (!mpqemu_msg_send(&msg, proxy_listener->ioc, &local_err)) {
error_report_err(local_err);
}
}
void proxy_memory_listener_deconfigure(ProxyMemoryListener *proxy_listener)
{
memory_listener_unregister(&proxy_listener->listener);
proxy_memory_listener_reset(&proxy_listener->listener);
}
void proxy_memory_listener_configure(ProxyMemoryListener *proxy_listener,
QIOChannel *ioc)
{
proxy_listener->n_mr_sections = 0;
proxy_listener->mr_sections = NULL;
proxy_listener->ioc = ioc;
proxy_listener->listener.begin = proxy_memory_listener_reset;
proxy_listener->listener.commit = proxy_memory_listener_commit;
proxy_listener->listener.region_add = proxy_memory_listener_region_addnop;
proxy_listener->listener.region_nop = proxy_memory_listener_region_addnop;
proxy_listener->listener.priority = 10;
proxy_listener->listener.name = "proxy";
memory_listener_register(&proxy_listener->listener,
&address_space_memory);
}
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