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cpu-data: Pretend to always run on logical processor #0

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The output of cpuid depends on the logical processor id the process
runs on, as reflected by the "local apic id" present in cpuid leaves
(eax=1,ebx=0), (eax=11,ebx=0), and (eax=11,ebx=1). This produces
arbitrary changes in the output files that complicate comparisons.

This patch masks the occurences of the local apic id with 0x00, so
that two consecutive runs of "./cpu-data.py gather" produce identical
results.

Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
This commit is contained in:
Tim Wiederhake 2021-01-08 15:43:02 +01:00 committed by Jiri Denemark
parent 05e73a8747
commit 10b5e789c5
1 changed files with 15 additions and 1 deletions
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16
tests/cputestdata/cpu-data.py
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@ -36,6 +36,13 @@ def gather_name(args):
def gather_cpuid_leaves(args):
def mask(regs, eax_in, ecx_in, eax_mask, ebx_mask, ecx_mask, edx_mask):
if regs["eax_in"] == eax_in and regs["ecx_in"] == ecx_in:
regs["eax"] &= eax_mask
regs["ebx"] &= ebx_mask
regs["ecx"] &= ecx_mask
regs["edx"] &= edx_mask
leave_pattern = re.compile(
"^\\s*"
"(0x[0-9a-f]+)\\s*"
@ -60,7 +67,7 @@ def gather_cpuid_leaves(args):
match = leave_pattern.match(line)
if not match:
continue
yield {
regs = {
"eax_in": int(match.group(1), 0),
"ecx_in": int(match.group(2), 0),
"eax": int(match.group(3), 0),
@ -68,6 +75,13 @@ def gather_cpuid_leaves(args):
"ecx": int(match.group(5), 0),
"edx": int(match.group(6), 0)}
# local apic id. Pretend to always run on logical processor #0.
mask(regs, 0x01, 0x00, 0xffffffff, 0x00ffffff, 0xffffffff, 0xffffffff)
mask(regs, 0x0b, 0x00, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffff00)
mask(regs, 0x0b, 0x01, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffff00)
yield regs
def gather_msr():
msrs = dict()