Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH] x86/perf: Avoid warning for Arch LBR without XSAVE | Date | Wed, 15 Dec 2021 12:40:29 -0800 |
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Some hypervisors support Arch LBR, but without the LBR XSAVE support. The current Arch LBR init code prints a warning when the xsave size (0) is unexpected. Avoid printing the warning for the "no LBR XSAVE" case.
Signed-off-by: Andi Kleen <ak@linux.intel.com> --- arch/x86/events/intel/lbr.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c index 8043213b75a5..1b8fef8545fb 100644 --- a/arch/x86/events/intel/lbr.c +++ b/arch/x86/events/intel/lbr.c @@ -1726,6 +1726,8 @@ static bool is_arch_lbr_xsave_available(void) * Check the LBR state with the corresponding software structure. * Disable LBR XSAVES support if the size doesn't match. */ + if (xfeature_size(XFEATURE_LBR) == 0) + return false; if (WARN_ON(xfeature_size(XFEATURE_LBR) != get_lbr_state_size())) return false; -- 2.33.1
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