microcode_fits() must return distinct values for the success and
no-fit-but-no-error cases, so the caller can react accordingly. Make
it return 1 in the success case, and adjust its single caller.
Also remove an impossible code path - install_equiv_cpu_table(), which
gets called prior to microcode_fits(), never leaves equiv_cpu_table
being NULL without also returning an error.
Note that this is still awaiting testing on a system where the
regression was actually observed (which also requires a new enough
microcode_ctl package). Note also that this will need to be
backported to 4.0 and 4.1 (or the broken c/s that got backported
there reverted).
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
--- a/xen/arch/x86/microcode_amd.c
+++ b/xen/arch/x86/microcode_amd.c
@@ -76,14 +76,6 @@ static int microcode_fits(void *mc, int
/* We should bind the task to the CPU */
BUG_ON(cpu != raw_smp_processor_id());
- if ( equiv_cpu_table == NULL )
- {
- printk(KERN_INFO "microcode: CPU%d microcode update with "
- "version 0x%x (current=0x%x)\n",
- cpu, mc_header->patch_id, uci->cpu_sig.rev);
- goto out;
- }
-
current_cpu_id = cpuid_eax(0x00000001);
for ( i = 0; equiv_cpu_table[i].installed_cpu != 0; i++ )
@@ -96,7 +88,7 @@ static int microcode_fits(void *mc, int
}
if ( !equiv_cpu_id )
- return 0;
+ return 0;
if ( (mc_header->processor_rev_id) != equiv_cpu_id )
{
@@ -113,8 +105,7 @@ static int microcode_fits(void *mc, int
"update with version 0x%x (current=0x%x)\n",
cpu, mc_header->patch_id, uci->cpu_sig.rev);
-out:
- return 0;
+ return 1;
}
static int apply_microcode(int cpu)
@@ -285,7 +276,7 @@ static int cpu_request_microcode(int cpu
while ( (ret = get_next_ucode_from_buffer_amd(mc, buf, size, &offset)) ==
0)
{
error = microcode_fits(mc, cpu);
- if (error != 0)
+ if (error <= 0)
continue;
error = apply_microcode(cpu);
x86-microcode-amd-fix-23871.patch
Description: Text document
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