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>
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@ -142,6 +142,7 @@ static void i440fx_update_memory_mappings(PCII440FXState *d)
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int i, r;
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uint32_t smram;
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memory_region_transaction_begin();
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update_pam(d, 0xf0000, 0x100000, (d->dev.config[I440FX_PAM] >> 4) & 3,
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&d->pam_regions[0]);
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for(i = 0; i < 12; i++) {
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@ -162,6 +163,7 @@ static void i440fx_update_memory_mappings(PCII440FXState *d)
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d->smram_enabled = false;
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}
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}
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memory_region_transaction_commit();
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}
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static void i440fx_set_smm(int val, void *arg)
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