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memory: count number of active VGA logging clients 

For a board that has multiple framebuffer devices, both of them
might want to use DIRTY_MEMORY_VGA on the same memory region.
The lack of reference counting in memory_region_set_log makes
this very awkward to implement.

Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-07-14 13:56:53 +02:00
parent fb43096959
commit deb809edb8
2 changed files with 8 additions and 0 deletions
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1
include/exec/memory.h
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@ -180,6 +180,7 @@ struct MemoryRegion {
bool warning_printed; /* For reservations */
bool flush_coalesced_mmio;
bool global_locking;
uint8_t vga_logging_count;
MemoryRegion *alias;
hwaddr alias_offset;
int32_t priority;

7
memory.c
View File

@ -1433,8 +1433,15 @@ void memory_region_notify_iommu(MemoryRegion *mr,
void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
{
uint8_t mask = 1 << client;
uint8_t old_logging;
assert(client == DIRTY_MEMORY_VGA);
old_logging = mr->vga_logging_count;
mr->vga_logging_count += log ? 1 : -1;
if (!!old_logging == !!mr->vga_logging_count) {
return;
}
memory_region_transaction_begin();
mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
memory_region_update_pending |= mr->enabled;