On 10/31/2018 07:03 PM, Sasha Levin wrote:
From: Prarit Bhargava prarit@redhat.com
[ Upstream commit f69ffc5d3db8f1f03fd6d1df5930f9a1fbd787b6 ]
cpupower crashes on VMWare guests. The guests have the AMD PStateDef MSR (0xC0010064 + state number) set to zero. As a result fid and did are zero and the crash occurs because of a divide by zero (cof = fid/did). This can be prevented by checking the enable bit in the PStateDef MSR before calculating cof. By doing this the value of pstate[i] remains zero and the value can be tested before displaying the active Pstates.
Check the enable bit in the PstateDef register for all supported families and only print out enabled Pstates.
Hi Sasha,
This patch, f69ffc5d3db8, depends on 8c22e2f69592 ("cpupower: Fix AMD Family 0x17 msr_pstate size"). Without 8c22e2f69592 the patch below will always read a value of "0" and not output the correct data.
8c22e2f69592 must be applied to any stable branch that f69ffc5d3db8 is applied to.
P.
Signed-off-by: Prarit Bhargava prarit@redhat.com Cc: Shuah Khan shuah@kernel.org Cc: Stafford Horne shorne@gmail.com Signed-off-by: Shuah Khan (Samsung OSG) shuah@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org
tools/power/cpupower/utils/cpufreq-info.c | 2 ++ tools/power/cpupower/utils/helpers/amd.c | 5 +++++ 2 files changed, 7 insertions(+)
diff --git a/tools/power/cpupower/utils/cpufreq-info.c b/tools/power/cpupower/utils/cpufreq-info.c index df43cd45d810..ccd08dd00996 100644 --- a/tools/power/cpupower/utils/cpufreq-info.c +++ b/tools/power/cpupower/utils/cpufreq-info.c @@ -200,6 +200,8 @@ static int get_boost_mode(unsigned int cpu) printf(_(" Boost States: %d\n"), b_states); printf(_(" Total States: %d\n"), pstate_no); for (i = 0; i < pstate_no; i++) {
if (!pstates[i])continue; if (i < b_states) printf(_(" Pstate-Pb%d: %luMHz (boost state)" "\n"), i, pstates[i]);diff --git a/tools/power/cpupower/utils/helpers/amd.c b/tools/power/cpupower/utils/helpers/amd.c index bb41cdd0df6b..58d23997424d 100644 --- a/tools/power/cpupower/utils/helpers/amd.c +++ b/tools/power/cpupower/utils/helpers/amd.c @@ -119,6 +119,11 @@ int decode_pstates(unsigned int cpu, unsigned int cpu_family, } if (read_msr(cpu, MSR_AMD_PSTATE + i, &pstate.val)) return -1;
if ((cpu_family == 0x17) && (!pstate.fam17h_bits.en))continue;else if (!pstate.bits.en)continue;- pstates[i] = get_cof(cpu_family, pstate); } *no = i;