2021-01-29 17:46:18 +01:00
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/*
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* Copyright © 2018, 2021 Oracle and/or its affiliates.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qemu/compiler.h"
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#include "qemu/int128.h"
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#include "qemu/range.h"
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#include "exec/memory.h"
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#include "exec/cpu-common.h"
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#include "exec/ram_addr.h"
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#include "qapi/error.h"
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#include "hw/remote/mpqemu-link.h"
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#include "hw/remote/proxy-memory-listener.h"
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/*
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* TODO: get_fd_from_hostaddr(), proxy_mrs_can_merge() and
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* proxy_memory_listener_commit() defined below perform tasks similar to the
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* functions defined in vhost-user.c. These functions are good candidates
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* for refactoring.
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*
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*/
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static void proxy_memory_listener_reset(MemoryListener *listener)
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{
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ProxyMemoryListener *proxy_listener = container_of(listener,
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ProxyMemoryListener,
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listener);
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int mrs;
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for (mrs = 0; mrs < proxy_listener->n_mr_sections; mrs++) {
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memory_region_unref(proxy_listener->mr_sections[mrs].mr);
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}
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g_free(proxy_listener->mr_sections);
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proxy_listener->mr_sections = NULL;
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proxy_listener->n_mr_sections = 0;
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}
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static int get_fd_from_hostaddr(uint64_t host, ram_addr_t *offset)
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{
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MemoryRegion *mr;
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ram_addr_t off;
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/**
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* Assumes that the host address is a valid address as it's
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* coming from the MemoryListener system. In the case host
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* address is not valid, the following call would return
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* the default subregion of "system_memory" region, and
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* not NULL. So it's not possible to check for NULL here.
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*/
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mr = memory_region_from_host((void *)(uintptr_t)host, &off);
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if (offset) {
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*offset = off;
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}
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return memory_region_get_fd(mr);
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}
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static bool proxy_mrs_can_merge(uint64_t host, uint64_t prev_host, size_t size)
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{
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if (((prev_host + size) != host)) {
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return false;
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}
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if (get_fd_from_hostaddr(host, NULL) !=
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get_fd_from_hostaddr(prev_host, NULL)) {
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return false;
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}
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return true;
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}
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static bool try_merge(ProxyMemoryListener *proxy_listener,
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MemoryRegionSection *section)
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{
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uint64_t mrs_size, mrs_gpa, mrs_page;
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MemoryRegionSection *prev_sec;
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bool merged = false;
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uintptr_t mrs_host;
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RAMBlock *mrs_rb;
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if (!proxy_listener->n_mr_sections) {
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return false;
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}
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mrs_rb = section->mr->ram_block;
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mrs_page = (uint64_t)qemu_ram_pagesize(mrs_rb);
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mrs_size = int128_get64(section->size);
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mrs_gpa = section->offset_within_address_space;
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mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) +
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section->offset_within_region;
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if (get_fd_from_hostaddr(mrs_host, NULL) < 0) {
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return true;
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}
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mrs_host = mrs_host & ~(mrs_page - 1);
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mrs_gpa = mrs_gpa & ~(mrs_page - 1);
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mrs_size = ROUND_UP(mrs_size, mrs_page);
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prev_sec = proxy_listener->mr_sections +
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(proxy_listener->n_mr_sections - 1);
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uint64_t prev_gpa_start = prev_sec->offset_within_address_space;
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uint64_t prev_size = int128_get64(prev_sec->size);
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uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size);
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uint64_t prev_host_start =
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(uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) +
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prev_sec->offset_within_region;
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uint64_t prev_host_end = range_get_last(prev_host_start, prev_size);
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if (mrs_gpa <= (prev_gpa_end + 1)) {
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g_assert(mrs_gpa > prev_gpa_start);
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if ((section->mr == prev_sec->mr) &&
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proxy_mrs_can_merge(mrs_host, prev_host_start,
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(mrs_gpa - prev_gpa_start))) {
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uint64_t max_end = MAX(prev_host_end, mrs_host + mrs_size);
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merged = true;
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prev_sec->offset_within_address_space =
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MIN(prev_gpa_start, mrs_gpa);
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prev_sec->offset_within_region =
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MIN(prev_host_start, mrs_host) -
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(uintptr_t)memory_region_get_ram_ptr(prev_sec->mr);
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prev_sec->size = int128_make64(max_end - MIN(prev_host_start,
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mrs_host));
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}
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}
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return merged;
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}
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static void proxy_memory_listener_region_addnop(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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ProxyMemoryListener *proxy_listener = container_of(listener,
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ProxyMemoryListener,
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listener);
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if (!memory_region_is_ram(section->mr) ||
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memory_region_is_rom(section->mr)) {
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return;
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}
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if (try_merge(proxy_listener, section)) {
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return;
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}
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++proxy_listener->n_mr_sections;
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proxy_listener->mr_sections = g_renew(MemoryRegionSection,
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proxy_listener->mr_sections,
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proxy_listener->n_mr_sections);
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proxy_listener->mr_sections[proxy_listener->n_mr_sections - 1] = *section;
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proxy_listener->mr_sections[proxy_listener->n_mr_sections - 1].fv = NULL;
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memory_region_ref(section->mr);
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}
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static void proxy_memory_listener_commit(MemoryListener *listener)
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{
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ProxyMemoryListener *proxy_listener = container_of(listener,
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ProxyMemoryListener,
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listener);
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MPQemuMsg msg;
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MemoryRegionSection *section;
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ram_addr_t offset;
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uintptr_t host_addr;
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int region;
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Error *local_err = NULL;
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memset(&msg, 0, sizeof(MPQemuMsg));
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msg.cmd = MPQEMU_CMD_SYNC_SYSMEM;
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msg.num_fds = proxy_listener->n_mr_sections;
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msg.size = sizeof(SyncSysmemMsg);
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if (msg.num_fds > REMOTE_MAX_FDS) {
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error_report("Number of fds is more than %d", REMOTE_MAX_FDS);
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return;
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}
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for (region = 0; region < proxy_listener->n_mr_sections; region++) {
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section = &proxy_listener->mr_sections[region];
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msg.data.sync_sysmem.gpas[region] =
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section->offset_within_address_space;
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msg.data.sync_sysmem.sizes[region] = int128_get64(section->size);
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host_addr = (uintptr_t)memory_region_get_ram_ptr(section->mr) +
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section->offset_within_region;
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msg.fds[region] = get_fd_from_hostaddr(host_addr, &offset);
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msg.data.sync_sysmem.offsets[region] = offset;
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}
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if (!mpqemu_msg_send(&msg, proxy_listener->ioc, &local_err)) {
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error_report_err(local_err);
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}
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}
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void proxy_memory_listener_deconfigure(ProxyMemoryListener *proxy_listener)
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{
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memory_listener_unregister(&proxy_listener->listener);
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proxy_memory_listener_reset(&proxy_listener->listener);
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}
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void proxy_memory_listener_configure(ProxyMemoryListener *proxy_listener,
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QIOChannel *ioc)
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{
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proxy_listener->n_mr_sections = 0;
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proxy_listener->mr_sections = NULL;
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proxy_listener->ioc = ioc;
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proxy_listener->listener.begin = proxy_memory_listener_reset;
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proxy_listener->listener.commit = proxy_memory_listener_commit;
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proxy_listener->listener.region_add = proxy_memory_listener_region_addnop;
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proxy_listener->listener.region_nop = proxy_memory_listener_region_addnop;
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proxy_listener->listener.priority = 10;
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2021-08-17 03:35:52 +02:00
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proxy_listener->listener.name = "proxy";
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2021-01-29 17:46:18 +01:00
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memory_listener_register(&proxy_listener->listener,
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&address_space_memory);
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}
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