Guests use this number as a hint for alignment and I/O request sizes. Given
that modern disks have 4K block sizes, and cached file-backed images also
have 4K block sizes, this hint can improve guest performance.
We probably need to make this configurable depending on machine type. It
should be the default for -M 0.13 only as it can affect guest code paths.
Signed-off-by: Avi Kivity <a...@redhat.com>
---
hw/ide/core.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 76c3820..89fd3ce 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -164,6 +164,7 @@ static void ide_identify(IDEState *s)
put_le16(p + 101, s->nb_sectors >> 16);
put_le16(p + 102, s->nb_sectors >> 32);
put_le16(p + 103, s->nb_sectors >> 48);
+ put_le16(p + 106, 0x6000 | 3); /* 8 logical sectors per physical sector */
memcpy(s->identify_data, p, sizeof(s->identify_data));
s->identify_set = 1;
--
1.6.5.3
