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exec: split length -> used_length/max_length

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This patch allows us to distinguish between two
length values for each block:
    max_length - length of memory block that was allocated
    used_length - length of block used by QEMU/guest

Currently, we set used_length - max_length, unconditionally.
Follow-up patches allow used_length <= max_length.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2014-12-15 22:55:32 +02:00
parent c8d6f66ae7
commit 9b8424d573
3 changed files with 40 additions and 34 deletions
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3
include/exec/cpu-all.h
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@ -303,7 +303,8 @@ typedef struct RAMBlock {
struct MemoryRegion *mr;
uint8_t *host;
ram_addr_t offset;
ram_addr_t length;
ram_addr_t used_length;
ram_addr_t max_length;
uint32_t flags;
char idstr[256];
/* Reads can take either the iothread or the ramlist lock.