On recent Intel CPUs it's possible to count the number of SMIs that have occurred, by reading msr 0x34.
I have checked the manuals at - https://developer.amd.com/resources/developer-guides-manuals/
for an equivalent register/function, without success.
否,但 SMI 计数可用作 AMD 处理器上的 PMC(性能计数器)。
AMD Zen specifies the LsSmiRx performance counter for System Management Interrupts (SMIs) :
PMCx02B [SMIs Received] (Core::X86::Pmc::Core::LsSmiRx) Counts the number of SMIs received.
On Linux, you can monitor it like this:
# perf stat -e ls_smi_rx -I 60000
This command prints each minute a count of all newly triggered SMIs aggregated over all CPUs.
That means for monitoring - unlike with the MSR_SMI_COUNT
register available on Intel CPUs - you have to actively program a PMU register (to observe the LsSmiRx event).
NB: The above referenced AMD documentation confirms that AMD Zen doesn't support the SMI_COUNT MSR (0x34), since it isn't included in the list of available MSRs (in Chapter 2.1.10, page 77).
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