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piix_pci: wrap memory update in a transaction 

The code will remap all PAMs, even if just one is updated, resulting
in reduced performance.  Wrap in a transaction to detect that those
other PAMs have not changed.

Reviewed-by: Richard Henderson  <rth@twiddle.net>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2011-08-01 11:04:39 +03:00
parent 64c048f4a8
commit 72124c01c6
1 changed files with 2 additions and 0 deletions
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2
hw/piix_pci.c
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@ -142,6 +142,7 @@ static void i440fx_update_memory_mappings(PCII440FXState *d)
int i, r;
uint32_t smram;
memory_region_transaction_begin();
update_pam(d, 0xf0000, 0x100000, (d->dev.config[I440FX_PAM] >> 4) & 3,
&d->pam_regions[0]);
for(i = 0; i < 12; i++) {
@ -162,6 +163,7 @@ static void i440fx_update_memory_mappings(PCII440FXState *d)
d->smram_enabled = false;
}
}
memory_region_transaction_commit();
}
static void i440fx_set_smm(int val, void *arg)