Allow RAM MemoryRegion to be created from an offset in a file, instead of allocating at offset of 0 by default. This is needed to synchronize RAM between QEMU & remote process. Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 609996697ad8617e3b01df38accc5c208c24d74e.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
518 lines
17 KiB
C
518 lines
17 KiB
C
/*
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* Declarations for cpu physical memory functions
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*
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* Copyright 2011 Red Hat, Inc. and/or its affiliates
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*
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* Authors:
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* Avi Kivity <avi@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*
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*/
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/*
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* This header is for use by exec.c and memory.c ONLY. Do not include it.
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* The functions declared here will be removed soon.
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*/
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#ifndef RAM_ADDR_H
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#define RAM_ADDR_H
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#ifndef CONFIG_USER_ONLY
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#include "cpu.h"
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#include "sysemu/xen.h"
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#include "sysemu/tcg.h"
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#include "exec/ramlist.h"
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#include "exec/ramblock.h"
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/**
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* clear_bmap_size: calculate clear bitmap size
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*
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* @pages: number of guest pages
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* @shift: guest page number shift
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*
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* Returns: number of bits for the clear bitmap
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*/
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static inline long clear_bmap_size(uint64_t pages, uint8_t shift)
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{
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return DIV_ROUND_UP(pages, 1UL << shift);
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}
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/**
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* clear_bmap_set: set clear bitmap for the page range
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*
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* @rb: the ramblock to operate on
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* @start: the start page number
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* @size: number of pages to set in the bitmap
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*
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* Returns: None
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*/
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static inline void clear_bmap_set(RAMBlock *rb, uint64_t start,
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uint64_t npages)
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{
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uint8_t shift = rb->clear_bmap_shift;
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bitmap_set_atomic(rb->clear_bmap, start >> shift,
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clear_bmap_size(npages, shift));
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}
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/**
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* clear_bmap_test_and_clear: test clear bitmap for the page, clear if set
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*
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* @rb: the ramblock to operate on
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* @page: the page number to check
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*
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* Returns: true if the bit was set, false otherwise
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*/
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static inline bool clear_bmap_test_and_clear(RAMBlock *rb, uint64_t page)
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{
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uint8_t shift = rb->clear_bmap_shift;
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return bitmap_test_and_clear_atomic(rb->clear_bmap, page >> shift, 1);
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}
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static inline bool offset_in_ramblock(RAMBlock *b, ram_addr_t offset)
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{
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return (b && b->host && offset < b->used_length) ? true : false;
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}
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static inline void *ramblock_ptr(RAMBlock *block, ram_addr_t offset)
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{
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assert(offset_in_ramblock(block, offset));
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return (char *)block->host + offset;
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}
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static inline unsigned long int ramblock_recv_bitmap_offset(void *host_addr,
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RAMBlock *rb)
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{
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uint64_t host_addr_offset =
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(uint64_t)(uintptr_t)(host_addr - (void *)rb->host);
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return host_addr_offset >> TARGET_PAGE_BITS;
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}
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bool ramblock_is_pmem(RAMBlock *rb);
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long qemu_minrampagesize(void);
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long qemu_maxrampagesize(void);
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/**
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* qemu_ram_alloc_from_file,
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* qemu_ram_alloc_from_fd: Allocate a ram block from the specified backing
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* file or device
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*
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* Parameters:
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* @size: the size in bytes of the ram block
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* @mr: the memory region where the ram block is
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* @ram_flags: specify the properties of the ram block, which can be one
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* or bit-or of following values
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* - RAM_SHARED: mmap the backing file or device with MAP_SHARED
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* - RAM_PMEM: the backend @mem_path or @fd is persistent memory
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* Other bits are ignored.
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* @mem_path or @fd: specify the backing file or device
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* @readonly: true to open @path for reading, false for read/write.
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* @errp: pointer to Error*, to store an error if it happens
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*
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* Return:
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* On success, return a pointer to the ram block.
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* On failure, return NULL.
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*/
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RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
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uint32_t ram_flags, const char *mem_path,
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bool readonly, Error **errp);
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RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
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uint32_t ram_flags, int fd, off_t offset,
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bool readonly, Error **errp);
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RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
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MemoryRegion *mr, Error **errp);
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RAMBlock *qemu_ram_alloc(ram_addr_t size, bool share, MemoryRegion *mr,
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Error **errp);
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RAMBlock *qemu_ram_alloc_resizeable(ram_addr_t size, ram_addr_t max_size,
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void (*resized)(const char*,
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uint64_t length,
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void *host),
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MemoryRegion *mr, Error **errp);
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void qemu_ram_free(RAMBlock *block);
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int qemu_ram_resize(RAMBlock *block, ram_addr_t newsize, Error **errp);
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void qemu_ram_msync(RAMBlock *block, ram_addr_t start, ram_addr_t length);
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/* Clear whole block of mem */
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static inline void qemu_ram_block_writeback(RAMBlock *block)
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{
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qemu_ram_msync(block, 0, block->used_length);
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}
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#define DIRTY_CLIENTS_ALL ((1 << DIRTY_MEMORY_NUM) - 1)
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#define DIRTY_CLIENTS_NOCODE (DIRTY_CLIENTS_ALL & ~(1 << DIRTY_MEMORY_CODE))
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void tb_invalidate_phys_range(ram_addr_t start, ram_addr_t end);
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static inline bool cpu_physical_memory_get_dirty(ram_addr_t start,
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ram_addr_t length,
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unsigned client)
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{
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DirtyMemoryBlocks *blocks;
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unsigned long end, page;
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unsigned long idx, offset, base;
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bool dirty = false;
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assert(client < DIRTY_MEMORY_NUM);
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end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
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page = start >> TARGET_PAGE_BITS;
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WITH_RCU_READ_LOCK_GUARD() {
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blocks = qatomic_rcu_read(&ram_list.dirty_memory[client]);
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idx = page / DIRTY_MEMORY_BLOCK_SIZE;
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offset = page % DIRTY_MEMORY_BLOCK_SIZE;
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base = page - offset;
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while (page < end) {
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unsigned long next = MIN(end, base + DIRTY_MEMORY_BLOCK_SIZE);
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unsigned long num = next - base;
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unsigned long found = find_next_bit(blocks->blocks[idx],
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num, offset);
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if (found < num) {
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dirty = true;
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break;
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}
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page = next;
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idx++;
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offset = 0;
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base += DIRTY_MEMORY_BLOCK_SIZE;
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}
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}
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return dirty;
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}
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static inline bool cpu_physical_memory_all_dirty(ram_addr_t start,
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ram_addr_t length,
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unsigned client)
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{
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DirtyMemoryBlocks *blocks;
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unsigned long end, page;
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unsigned long idx, offset, base;
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bool dirty = true;
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assert(client < DIRTY_MEMORY_NUM);
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end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
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page = start >> TARGET_PAGE_BITS;
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RCU_READ_LOCK_GUARD();
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blocks = qatomic_rcu_read(&ram_list.dirty_memory[client]);
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idx = page / DIRTY_MEMORY_BLOCK_SIZE;
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offset = page % DIRTY_MEMORY_BLOCK_SIZE;
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base = page - offset;
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while (page < end) {
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unsigned long next = MIN(end, base + DIRTY_MEMORY_BLOCK_SIZE);
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unsigned long num = next - base;
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unsigned long found = find_next_zero_bit(blocks->blocks[idx], num, offset);
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if (found < num) {
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dirty = false;
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break;
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}
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page = next;
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idx++;
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offset = 0;
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base += DIRTY_MEMORY_BLOCK_SIZE;
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}
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return dirty;
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}
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static inline bool cpu_physical_memory_get_dirty_flag(ram_addr_t addr,
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unsigned client)
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{
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return cpu_physical_memory_get_dirty(addr, 1, client);
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}
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static inline bool cpu_physical_memory_is_clean(ram_addr_t addr)
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{
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bool vga = cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_VGA);
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bool code = cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_CODE);
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bool migration =
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cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_MIGRATION);
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return !(vga && code && migration);
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}
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static inline uint8_t cpu_physical_memory_range_includes_clean(ram_addr_t start,
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ram_addr_t length,
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uint8_t mask)
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{
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uint8_t ret = 0;
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if (mask & (1 << DIRTY_MEMORY_VGA) &&
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!cpu_physical_memory_all_dirty(start, length, DIRTY_MEMORY_VGA)) {
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ret |= (1 << DIRTY_MEMORY_VGA);
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}
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if (mask & (1 << DIRTY_MEMORY_CODE) &&
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!cpu_physical_memory_all_dirty(start, length, DIRTY_MEMORY_CODE)) {
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ret |= (1 << DIRTY_MEMORY_CODE);
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}
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if (mask & (1 << DIRTY_MEMORY_MIGRATION) &&
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!cpu_physical_memory_all_dirty(start, length, DIRTY_MEMORY_MIGRATION)) {
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ret |= (1 << DIRTY_MEMORY_MIGRATION);
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}
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return ret;
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}
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static inline void cpu_physical_memory_set_dirty_flag(ram_addr_t addr,
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unsigned client)
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{
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unsigned long page, idx, offset;
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DirtyMemoryBlocks *blocks;
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assert(client < DIRTY_MEMORY_NUM);
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page = addr >> TARGET_PAGE_BITS;
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idx = page / DIRTY_MEMORY_BLOCK_SIZE;
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offset = page % DIRTY_MEMORY_BLOCK_SIZE;
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RCU_READ_LOCK_GUARD();
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blocks = qatomic_rcu_read(&ram_list.dirty_memory[client]);
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set_bit_atomic(offset, blocks->blocks[idx]);
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}
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static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start,
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ram_addr_t length,
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uint8_t mask)
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{
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DirtyMemoryBlocks *blocks[DIRTY_MEMORY_NUM];
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unsigned long end, page;
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unsigned long idx, offset, base;
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int i;
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if (!mask && !xen_enabled()) {
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return;
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}
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end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
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page = start >> TARGET_PAGE_BITS;
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WITH_RCU_READ_LOCK_GUARD() {
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for (i = 0; i < DIRTY_MEMORY_NUM; i++) {
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blocks[i] = qatomic_rcu_read(&ram_list.dirty_memory[i]);
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}
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idx = page / DIRTY_MEMORY_BLOCK_SIZE;
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offset = page % DIRTY_MEMORY_BLOCK_SIZE;
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base = page - offset;
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while (page < end) {
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unsigned long next = MIN(end, base + DIRTY_MEMORY_BLOCK_SIZE);
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if (likely(mask & (1 << DIRTY_MEMORY_MIGRATION))) {
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bitmap_set_atomic(blocks[DIRTY_MEMORY_MIGRATION]->blocks[idx],
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offset, next - page);
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}
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if (unlikely(mask & (1 << DIRTY_MEMORY_VGA))) {
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bitmap_set_atomic(blocks[DIRTY_MEMORY_VGA]->blocks[idx],
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offset, next - page);
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}
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if (unlikely(mask & (1 << DIRTY_MEMORY_CODE))) {
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bitmap_set_atomic(blocks[DIRTY_MEMORY_CODE]->blocks[idx],
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offset, next - page);
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}
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page = next;
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idx++;
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offset = 0;
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base += DIRTY_MEMORY_BLOCK_SIZE;
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}
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}
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xen_hvm_modified_memory(start, length);
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}
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#if !defined(_WIN32)
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static inline void cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap,
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ram_addr_t start,
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ram_addr_t pages)
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{
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unsigned long i, j;
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unsigned long page_number, c;
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hwaddr addr;
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ram_addr_t ram_addr;
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unsigned long len = (pages + HOST_LONG_BITS - 1) / HOST_LONG_BITS;
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unsigned long hpratio = qemu_real_host_page_size / TARGET_PAGE_SIZE;
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unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
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/* start address is aligned at the start of a word? */
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if ((((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) &&
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(hpratio == 1)) {
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unsigned long **blocks[DIRTY_MEMORY_NUM];
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unsigned long idx;
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unsigned long offset;
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long k;
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long nr = BITS_TO_LONGS(pages);
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idx = (start >> TARGET_PAGE_BITS) / DIRTY_MEMORY_BLOCK_SIZE;
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offset = BIT_WORD((start >> TARGET_PAGE_BITS) %
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DIRTY_MEMORY_BLOCK_SIZE);
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WITH_RCU_READ_LOCK_GUARD() {
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for (i = 0; i < DIRTY_MEMORY_NUM; i++) {
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blocks[i] =
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qatomic_rcu_read(&ram_list.dirty_memory[i])->blocks;
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}
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for (k = 0; k < nr; k++) {
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if (bitmap[k]) {
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unsigned long temp = leul_to_cpu(bitmap[k]);
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qatomic_or(&blocks[DIRTY_MEMORY_VGA][idx][offset], temp);
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if (global_dirty_log) {
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qatomic_or(
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&blocks[DIRTY_MEMORY_MIGRATION][idx][offset],
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temp);
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}
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if (tcg_enabled()) {
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qatomic_or(&blocks[DIRTY_MEMORY_CODE][idx][offset],
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temp);
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}
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}
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if (++offset >= BITS_TO_LONGS(DIRTY_MEMORY_BLOCK_SIZE)) {
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offset = 0;
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idx++;
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}
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}
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}
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xen_hvm_modified_memory(start, pages << TARGET_PAGE_BITS);
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} else {
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uint8_t clients = tcg_enabled() ? DIRTY_CLIENTS_ALL : DIRTY_CLIENTS_NOCODE;
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if (!global_dirty_log) {
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clients &= ~(1 << DIRTY_MEMORY_MIGRATION);
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}
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/*
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* bitmap-traveling is faster than memory-traveling (for addr...)
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* especially when most of the memory is not dirty.
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*/
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for (i = 0; i < len; i++) {
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if (bitmap[i] != 0) {
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c = leul_to_cpu(bitmap[i]);
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do {
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j = ctzl(c);
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c &= ~(1ul << j);
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page_number = (i * HOST_LONG_BITS + j) * hpratio;
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addr = page_number * TARGET_PAGE_SIZE;
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ram_addr = start + addr;
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cpu_physical_memory_set_dirty_range(ram_addr,
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TARGET_PAGE_SIZE * hpratio, clients);
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} while (c != 0);
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}
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}
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}
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}
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#endif /* not _WIN32 */
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bool cpu_physical_memory_test_and_clear_dirty(ram_addr_t start,
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ram_addr_t length,
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unsigned client);
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DirtyBitmapSnapshot *cpu_physical_memory_snapshot_and_clear_dirty
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(MemoryRegion *mr, hwaddr offset, hwaddr length, unsigned client);
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bool cpu_physical_memory_snapshot_get_dirty(DirtyBitmapSnapshot *snap,
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ram_addr_t start,
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ram_addr_t length);
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static inline void cpu_physical_memory_clear_dirty_range(ram_addr_t start,
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ram_addr_t length)
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{
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cpu_physical_memory_test_and_clear_dirty(start, length, DIRTY_MEMORY_MIGRATION);
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cpu_physical_memory_test_and_clear_dirty(start, length, DIRTY_MEMORY_VGA);
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cpu_physical_memory_test_and_clear_dirty(start, length, DIRTY_MEMORY_CODE);
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}
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/* Called with RCU critical section */
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static inline
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uint64_t cpu_physical_memory_sync_dirty_bitmap(RAMBlock *rb,
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ram_addr_t start,
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ram_addr_t length)
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{
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ram_addr_t addr;
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unsigned long word = BIT_WORD((start + rb->offset) >> TARGET_PAGE_BITS);
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uint64_t num_dirty = 0;
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unsigned long *dest = rb->bmap;
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/* start address and length is aligned at the start of a word? */
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if (((word * BITS_PER_LONG) << TARGET_PAGE_BITS) ==
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(start + rb->offset) &&
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!(length & ((BITS_PER_LONG << TARGET_PAGE_BITS) - 1))) {
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int k;
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int nr = BITS_TO_LONGS(length >> TARGET_PAGE_BITS);
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unsigned long * const *src;
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unsigned long idx = (word * BITS_PER_LONG) / DIRTY_MEMORY_BLOCK_SIZE;
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unsigned long offset = BIT_WORD((word * BITS_PER_LONG) %
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DIRTY_MEMORY_BLOCK_SIZE);
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unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
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src = qatomic_rcu_read(
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&ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION])->blocks;
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for (k = page; k < page + nr; k++) {
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if (src[idx][offset]) {
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unsigned long bits = qatomic_xchg(&src[idx][offset], 0);
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unsigned long new_dirty;
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new_dirty = ~dest[k];
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dest[k] |= bits;
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new_dirty &= bits;
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num_dirty += ctpopl(new_dirty);
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}
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if (++offset >= BITS_TO_LONGS(DIRTY_MEMORY_BLOCK_SIZE)) {
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offset = 0;
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idx++;
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}
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}
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|
|
if (rb->clear_bmap) {
|
|
/*
|
|
* Postpone the dirty bitmap clear to the point before we
|
|
* really send the pages, also we will split the clear
|
|
* dirty procedure into smaller chunks.
|
|
*/
|
|
clear_bmap_set(rb, start >> TARGET_PAGE_BITS,
|
|
length >> TARGET_PAGE_BITS);
|
|
} else {
|
|
/* Slow path - still do that in a huge chunk */
|
|
memory_region_clear_dirty_bitmap(rb->mr, start, length);
|
|
}
|
|
} else {
|
|
ram_addr_t offset = rb->offset;
|
|
|
|
for (addr = 0; addr < length; addr += TARGET_PAGE_SIZE) {
|
|
if (cpu_physical_memory_test_and_clear_dirty(
|
|
start + addr + offset,
|
|
TARGET_PAGE_SIZE,
|
|
DIRTY_MEMORY_MIGRATION)) {
|
|
long k = (start + addr) >> TARGET_PAGE_BITS;
|
|
if (!test_and_set_bit(k, dest)) {
|
|
num_dirty++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return num_dirty;
|
|
}
|
|
#endif
|
|
#endif
|