linux-kernel - Re: [PATCH] perf/x86: Check data address for IBS software filter

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Message-ID: <28663df2-31f2-4726-9dad-a78e1b19afc9@amd.com>
Date: Mon, 17 Mar 2025 18:59:33 +0530
From: Ravi Bangoria <ravi.bangoria@....com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>,
 Kan Liang <kan.liang@...ux.intel.com>, Mark Rutland <mark.rutland@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Arnaldo Carvalho de Melo <acme@...nel.org>,
 LKML <linux-kernel@...r.kernel.org>, Matteo Rizzo <matteorizzo@...gle.com>,
 Ravi Bangoria <ravi.bangoria@....com>
Subject: Re: [PATCH] perf/x86: Check data address for IBS software filter

Hi Namhyung,

> @@ -1286,6 +1286,13 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs)
>  	if (perf_ibs == &perf_ibs_op)
>  		perf_ibs_parse_ld_st_data(event->attr.sample_type, &ibs_data, &data);
>  
> +	if ((event->attr.config2 & IBS_SW_FILTER_MASK) &&
> +	    (event->attr.sample_type & PERF_SAMPLE_ADDR) &&
> +	    event->attr.exclude_kernel && !access_ok(data.addr)) {
> +		throttle = perf_event_account_interrupt(event);
> +		goto out;
> +	}

Can this move up where it checks perf_exclude_event()? Use
ibs_data.regs[ibs_op_msr_idx(MSR_AMD64_IBSDCLINAD)] instead
of data.addr.

Thanks,
Ravi