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# HG changeset patch
# User Keir Fraser <keir.fraser@citrix.com>
# Date 1232622699 0
# Node ID adc3775bb6d8aa1070b8aaaa186a2a98898f9478
# Parent a1d0868ffadf171ce9f4c61f4dc57f4d4abe4e4c
x86 ucode: optimizing microcode update

It's possible the data file has multiple matching ucode, we needn't to
update multiple times, just keep searching the latest version, and
update once.

Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
---
xen/arch/x86/microcode_intel.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletion(-)

diff -r a1d0868ffadf -r adc3775bb6d8 xen/arch/x86/microcode_intel.c
--- a/xen/arch/x86/microcode_intel.c Thu Jan 22 11:11:10 2009 +0000
+++ b/xen/arch/x86/microcode_intel.c Thu Jan 22 11:11:39 2009 +0000
@@ -325,6 +325,7 @@ static int cpu_request_microcode(int cpu
long offset = 0;
int error = 0;
void *mc;
+ unsigned int matching_count = 0;

/* We should bind the task to the CPU */
BUG_ON(cpu != raw_smp_processor_id());
@@ -343,7 +344,7 @@ static int cpu_request_microcode(int cpu
*/
if ( error == 1 )
{
- apply_microcode(cpu);
+ matching_count++;
error = 0;
}
xfree(mc);
@@ -352,6 +353,9 @@ static int cpu_request_microcode(int cpu
xfree(mc);
if ( offset < 0 )
error = offset;
+
+ if ( !error && matching_count )
+ apply_microcode(cpu);

return error;
}

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