diff options
Diffstat (limited to 'target/i386/hax/hax-mem.c')
| -rw-r--r-- | target/i386/hax/hax-mem.c | 323 |
1 files changed, 0 insertions, 323 deletions
diff --git a/target/i386/hax/hax-mem.c b/target/i386/hax/hax-mem.c deleted file mode 100644 index bb5ffbc9ac..0000000000 --- a/target/i386/hax/hax-mem.c +++ /dev/null @@ -1,323 +0,0 @@ -/* - * HAX memory mapping operations - * - * Copyright (c) 2015-16 Intel Corporation - * Copyright 2016 Google, Inc. - * - * This work is licensed under the terms of the GNU GPL, version 2. See - * the COPYING file in the top-level directory. - */ - -#include "qemu/osdep.h" -#include "cpu.h" -#include "exec/address-spaces.h" -#include "qemu/error-report.h" - -#include "hax-accel-ops.h" -#include "qemu/queue.h" - -#define DEBUG_HAX_MEM 0 - -#define DPRINTF(fmt, ...) \ - do { \ - if (DEBUG_HAX_MEM) { \ - fprintf(stdout, fmt, ## __VA_ARGS__); \ - } \ - } while (0) - -/** - * HAXMapping: describes a pending guest physical memory mapping - * - * @start_pa: a guest physical address marking the start of the region; must be - * page-aligned - * @size: a guest physical address marking the end of the region; must be - * page-aligned - * @host_va: the host virtual address of the start of the mapping - * @flags: mapping parameters e.g. HAX_RAM_INFO_ROM or HAX_RAM_INFO_INVALID - * @entry: additional fields for linking #HAXMapping instances together - */ -typedef struct HAXMapping { - uint64_t start_pa; - uint32_t size; - uint64_t host_va; - int flags; - QTAILQ_ENTRY(HAXMapping) entry; -} HAXMapping; - -/* - * A doubly-linked list (actually a tail queue) of the pending page mappings - * for the ongoing memory transaction. - * - * It is used to optimize the number of page mapping updates done through the - * kernel module. For example, it's effective when a driver is digging an MMIO - * hole inside an existing memory mapping. It will get a deletion of the whole - * region, then the addition of the 2 remaining RAM areas around the hole and - * finally the memory transaction commit. During the commit, it will effectively - * send to the kernel only the removal of the pages from the MMIO hole after - * having computed locally the result of the deletion and additions. - */ -static QTAILQ_HEAD(, HAXMapping) mappings = - QTAILQ_HEAD_INITIALIZER(mappings); - -/** - * hax_mapping_dump_list: dumps @mappings to stdout (for debugging) - */ -static void hax_mapping_dump_list(void) -{ - HAXMapping *entry; - - DPRINTF("%s updates:\n", __func__); - QTAILQ_FOREACH(entry, &mappings, entry) { - DPRINTF("\t%c 0x%016" PRIx64 "->0x%016" PRIx64 " VA 0x%016" PRIx64 - "%s\n", entry->flags & HAX_RAM_INFO_INVALID ? '-' : '+', - entry->start_pa, entry->start_pa + entry->size, entry->host_va, - entry->flags & HAX_RAM_INFO_ROM ? " ROM" : ""); - } -} - -static void hax_insert_mapping_before(HAXMapping *next, uint64_t start_pa, - uint32_t size, uint64_t host_va, - uint8_t flags) -{ - HAXMapping *entry; - - entry = g_malloc0(sizeof(*entry)); - entry->start_pa = start_pa; - entry->size = size; - entry->host_va = host_va; - entry->flags = flags; - if (!next) { - QTAILQ_INSERT_TAIL(&mappings, entry, entry); - } else { - QTAILQ_INSERT_BEFORE(next, entry, entry); - } -} - -static bool hax_mapping_is_opposite(HAXMapping *entry, uint64_t host_va, - uint8_t flags) -{ - /* removed then added without change for the read-only flag */ - bool nop_flags = (entry->flags ^ flags) == HAX_RAM_INFO_INVALID; - - return (entry->host_va == host_va) && nop_flags; -} - -static void hax_update_mapping(uint64_t start_pa, uint32_t size, - uint64_t host_va, uint8_t flags) -{ - uint64_t end_pa = start_pa + size; - HAXMapping *entry, *next; - - QTAILQ_FOREACH_SAFE(entry, &mappings, entry, next) { - uint32_t chunk_sz; - if (start_pa >= entry->start_pa + entry->size) { - continue; - } - if (start_pa < entry->start_pa) { - chunk_sz = end_pa <= entry->start_pa ? size - : entry->start_pa - start_pa; - hax_insert_mapping_before(entry, start_pa, chunk_sz, - host_va, flags); - start_pa += chunk_sz; - host_va += chunk_sz; - size -= chunk_sz; - } else if (start_pa > entry->start_pa) { - /* split the existing chunk at start_pa */ - chunk_sz = start_pa - entry->start_pa; - hax_insert_mapping_before(entry, entry->start_pa, chunk_sz, - entry->host_va, entry->flags); - entry->start_pa += chunk_sz; - entry->host_va += chunk_sz; - entry->size -= chunk_sz; - } - /* now start_pa == entry->start_pa */ - chunk_sz = MIN(size, entry->size); - if (chunk_sz) { - bool nop = hax_mapping_is_opposite(entry, host_va, flags); - bool partial = chunk_sz < entry->size; - if (partial) { - /* remove the beginning of the existing chunk */ - entry->start_pa += chunk_sz; - entry->host_va += chunk_sz; - entry->size -= chunk_sz; - if (!nop) { - hax_insert_mapping_before(entry, start_pa, chunk_sz, - host_va, flags); - } - } else { /* affects the full mapping entry */ - if (nop) { /* no change to this mapping, remove it */ - QTAILQ_REMOVE(&mappings, entry, entry); - g_free(entry); - } else { /* update mapping properties */ - entry->host_va = host_va; - entry->flags = flags; - } - } - start_pa += chunk_sz; - host_va += chunk_sz; - size -= chunk_sz; - } - if (!size) { /* we are done */ - break; - } - } - if (size) { /* add the leftover */ - hax_insert_mapping_before(NULL, start_pa, size, host_va, flags); - } -} - -static void hax_process_section(MemoryRegionSection *section, uint8_t flags) -{ - MemoryRegion *mr = section->mr; - hwaddr start_pa = section->offset_within_address_space; - ram_addr_t size = int128_get64(section->size); - unsigned int delta; - uint64_t host_va; - uint32_t max_mapping_size; - - /* We only care about RAM and ROM regions */ - if (!memory_region_is_ram(mr)) { - if (memory_region_is_romd(mr)) { - /* HAXM kernel module does not support ROMD yet */ - warn_report("Ignoring ROMD region 0x%016" PRIx64 "->0x%016" PRIx64, - start_pa, start_pa + size); - } - return; - } - - /* Adjust start_pa and size so that they are page-aligned. (Cf - * kvm_set_phys_mem() in kvm-all.c). - */ - delta = qemu_real_host_page_size() - (start_pa & ~qemu_real_host_page_mask()); - delta &= ~qemu_real_host_page_mask(); - if (delta > size) { - return; - } - start_pa += delta; - size -= delta; - size &= qemu_real_host_page_mask(); - if (!size || (start_pa & ~qemu_real_host_page_mask())) { - return; - } - - host_va = (uintptr_t)memory_region_get_ram_ptr(mr) - + section->offset_within_region + delta; - if (memory_region_is_rom(section->mr)) { - flags |= HAX_RAM_INFO_ROM; - } - - /* - * The kernel module interface uses 32-bit sizes: - * https://github.com/intel/haxm/blob/master/API.md#hax_vm_ioctl_set_ram - * - * If the mapping size is longer than 32 bits, we can't process it in one - * call into the kernel. Instead, we split the mapping into smaller ones, - * and call hax_update_mapping() on each. - */ - max_mapping_size = UINT32_MAX & qemu_real_host_page_mask(); - while (size > max_mapping_size) { - hax_update_mapping(start_pa, max_mapping_size, host_va, flags); - start_pa += max_mapping_size; - size -= max_mapping_size; - host_va += max_mapping_size; - } - /* Now size <= max_mapping_size */ - hax_update_mapping(start_pa, (uint32_t)size, host_va, flags); -} - -static void hax_region_add(MemoryListener *listener, - MemoryRegionSection *section) -{ - memory_region_ref(section->mr); - hax_process_section(section, 0); -} - -static void hax_region_del(MemoryListener *listener, - MemoryRegionSection *section) -{ - hax_process_section(section, HAX_RAM_INFO_INVALID); - memory_region_unref(section->mr); -} - -static void hax_transaction_begin(MemoryListener *listener) -{ - g_assert(QTAILQ_EMPTY(&mappings)); -} - -static void hax_transaction_commit(MemoryListener *listener) -{ - if (!QTAILQ_EMPTY(&mappings)) { - HAXMapping *entry, *next; - - if (DEBUG_HAX_MEM) { - hax_mapping_dump_list(); - } - QTAILQ_FOREACH_SAFE(entry, &mappings, entry, next) { - if (entry->flags & HAX_RAM_INFO_INVALID) { - /* for unmapping, put the values expected by the kernel */ - entry->flags = HAX_RAM_INFO_INVALID; - entry->host_va = 0; - } - if (hax_set_ram(entry->start_pa, entry->size, - entry->host_va, entry->flags)) { - fprintf(stderr, "%s: Failed mapping @0x%016" PRIx64 "+0x%" - PRIx32 " flags %02x\n", __func__, entry->start_pa, - entry->size, entry->flags); - } - QTAILQ_REMOVE(&mappings, entry, entry); - g_free(entry); - } - } -} - -/* currently we fake the dirty bitmap sync, always dirty */ -static void hax_log_sync(MemoryListener *listener, - MemoryRegionSection *section) -{ - MemoryRegion *mr = section->mr; - - if (!memory_region_is_ram(mr)) { - /* Skip MMIO regions */ - return; - } - - memory_region_set_dirty(mr, 0, int128_get64(section->size)); -} - -static MemoryListener hax_memory_listener = { - .name = "hax", - .begin = hax_transaction_begin, - .commit = hax_transaction_commit, - .region_add = hax_region_add, - .region_del = hax_region_del, - .log_sync = hax_log_sync, - .priority = MEMORY_LISTENER_PRIORITY_ACCEL, -}; - -static void hax_ram_block_added(RAMBlockNotifier *n, void *host, size_t size, - size_t max_size) -{ - /* - * We must register each RAM block with the HAXM kernel module, or - * hax_set_ram() will fail for any mapping into the RAM block: - * https://github.com/intel/haxm/blob/master/API.md#hax_vm_ioctl_alloc_ram - * - * Old versions of the HAXM kernel module (< 6.2.0) used to preallocate all - * host physical pages for the RAM block as part of this registration - * process, hence the name hax_populate_ram(). - */ - if (hax_populate_ram((uint64_t)(uintptr_t)host, max_size) < 0) { - fprintf(stderr, "HAX failed to populate RAM\n"); - abort(); - } -} - -static struct RAMBlockNotifier hax_ram_notifier = { - .ram_block_added = hax_ram_block_added, -}; - -void hax_memory_init(void) -{ - ram_block_notifier_add(&hax_ram_notifier); - memory_listener_register(&hax_memory_listener, &address_space_memory); -} |