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migration: Simplify alignment and alignment checks 

Let's use QEMU_ALIGN_DOWN() and friends to make the code a bit easier to
read.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
David Hildenbrand 2021-10-11 19:53:44 +02:00 committed by Juan Quintela
parent 9470c5e082
commit 7648297d40
3 changed files with 8 additions and 9 deletions
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6
migration/migration.c
View File

@ -391,7 +391,7 @@ int migrate_send_rp_message_req_pages(MigrationIncomingState *mis,
int migrate_send_rp_req_pages(MigrationIncomingState *mis,
RAMBlock *rb, ram_addr_t start, uint64_t haddr)
{
void *aligned = (void *)(uintptr_t)(haddr & (-qemu_ram_pagesize(rb)));
void *aligned = (void *)(uintptr_t)ROUND_DOWN(haddr, qemu_ram_pagesize(rb));
bool received = false;
WITH_QEMU_LOCK_GUARD(&mis->page_request_mutex) {
@ -2637,8 +2637,8 @@ static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname,
* Since we currently insist on matching page sizes, just sanity check
* we're being asked for whole host pages.
*/
if (start & (our_host_ps - 1) ||
(len & (our_host_ps - 1))) {
if (!QEMU_IS_ALIGNED(start, our_host_ps) ||
!QEMU_IS_ALIGNED(len, our_host_ps)) {
error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT
" len: %zd", __func__, start, len);
mark_source_rp_bad(ms);

9
migration/postcopy-ram.c
View File

@ -402,7 +402,7 @@ bool postcopy_ram_supported_by_host(MigrationIncomingState *mis)
strerror(errno));
goto out;
}
g_assert(((size_t)testarea & (pagesize - 1)) == 0);
g_assert(QEMU_PTR_IS_ALIGNED(testarea, pagesize));
reg_struct.range.start = (uintptr_t)testarea;
reg_struct.range.len = pagesize;
@ -660,7 +660,7 @@ int postcopy_wake_shared(struct PostCopyFD *pcfd,
struct uffdio_range range;
int ret;
trace_postcopy_wake_shared(client_addr, qemu_ram_get_idstr(rb));
range.start = client_addr & ~(pagesize - 1);
range.start = ROUND_DOWN(client_addr, pagesize);
range.len = pagesize;
ret = ioctl(pcfd->fd, UFFDIO_WAKE, &range);
if (ret) {
@ -702,8 +702,7 @@ static int postcopy_request_page(MigrationIncomingState *mis, RAMBlock *rb,
int postcopy_request_shared_page(struct PostCopyFD *pcfd, RAMBlock *rb,
uint64_t client_addr, uint64_t rb_offset)
{
size_t pagesize = qemu_ram_pagesize(rb);
uint64_t aligned_rbo = rb_offset & ~(pagesize - 1);
uint64_t aligned_rbo = ROUND_DOWN(rb_offset, qemu_ram_pagesize(rb));
MigrationIncomingState *mis = migration_incoming_get_current();
trace_postcopy_request_shared_page(pcfd->idstr, qemu_ram_get_idstr(rb),
@ -993,7 +992,7 @@ static void *postcopy_ram_fault_thread(void *opaque)
break;
}
rb_offset &= ~(qemu_ram_pagesize(rb) - 1);
rb_offset = ROUND_DOWN(rb_offset, qemu_ram_pagesize(rb));
trace_postcopy_ram_fault_thread_request(msg.arg.pagefault.address,
qemu_ram_get_idstr(rb),
rb_offset,

2
migration/ram.c
View File

@ -811,7 +811,7 @@ static void migration_clear_memory_region_dirty_bitmap(RAMBlock *rb,
assert(shift >= 6);
size = 1ULL << (TARGET_PAGE_BITS + shift);
start = (((ram_addr_t)page) << TARGET_PAGE_BITS) & (-size);
start = QEMU_ALIGN_DOWN((ram_addr_t)page << TARGET_PAGE_BITS, size);
trace_migration_bitmap_clear_dirty(rb->idstr, start, size, page);
memory_region_clear_dirty_bitmap(rb->mr, start, size);
}