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From: Steven Rostedt <rostedt@goodmis.org>
To: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>
Cc: linux-trace-devel@vger.kernel.org
Subject: Re: [PATCH v19 10/15] trace-cmd: Add guest information in host's trace.dat file
Date: Wed, 26 Feb 2020 22:56:13 -0500
Message-ID: <20200226225613.08a0c7bd@oasis.local.home> (raw)
In-Reply-To: <20200131121111.130355-11-tz.stoyanov@gmail.com>

On Fri, 31 Jan 2020 14:11:06 +0200
"Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com> wrote:

> +static int trace_guest_load(struct tracecmd_input *handle, char *buf, int size)
> +{
> +	struct guest_trace_info *guest = NULL;
> +	int cpu;
> +	int i;
> +
> +	guest = calloc(1, sizeof(struct guest_trace_info));
> +	if (!guest)
> +		goto error;
> +
> +	/*
> +	 * Guest name, null terminated string
> +	 * long long (8 bytes) trace-id
> +	 * int (4 bytes) number of guest CPUs
> +	 * array of size number of guest CPUs:
> +	 *	int (4 bytes) Guest CPU id
> +	 *	int (4 bytes) Host PID, running the guest CPU
> +	 */
> +
> +	guest->name = strndup(buf, size);
> +	if (!guest->name)
> +		goto error;
> +	buf += strlen(guest->name) + 1;
> +	size -= strlen(guest->name) + 1;
> +
> +	if (size < sizeof(long long))
> +		goto error;
> +	guest->trace_id = tep_read_number(handle->pevent, buf, sizeof(long long));
> +	buf += sizeof(long long);

Don't we need:

	size -= sizeof(long long);

> +
> +	if (size < sizeof(int))
> +		goto error;
> +	guest->vcpu_count = tep_read_number(handle->pevent, buf, sizeof(int));
> +	buf += sizeof(int);

	size -= sizeof(int);

> +
> +	guest->cpu_pid = calloc(guest->vcpu_count, sizeof(int));
> +	if (!guest->cpu_pid)
> +		goto error;
> +
> +	for (i = 0; i < guest->vcpu_count; i++) {
> +		if (size < 2 * sizeof(int))
> +			goto error;
> +		cpu = tep_read_number(handle->pevent, buf, sizeof(int));
> +		buf += sizeof(int);
> +		if (cpu >= guest->vcpu_count)
> +			goto error;
> +		guest->cpu_pid[cpu] = tep_read_number(handle->pevent,
> +						      buf, sizeof(int));
> +		buf += sizeof(int);

		size -= 2 * sizeof(int);

-- Steve

> +	}
> +
> +	guest->next = handle->guest;
> +	handle->guest = guest;
> +	return 0;
> +
> +error:
> +	if (guest) {
> +		free(guest->cpu_pid);
> +		free(guest->name);
> +		free(guest);
> +	}
> +	return -1;
> +}
> +

  parent reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-31 12:10 [PATCH v19 00/15]Timestamp synchronization of host - guest tracing session Tzvetomir Stoyanov (VMware)
2020-01-31 12:10 ` [PATCH v19 01/15] trace-cmd: Add support for negative time offsets in trace.dat file Tzvetomir Stoyanov (VMware)
2020-01-31 12:10 ` [PATCH v19 02/15] trace-cmd: Add new library API for local CPU count Tzvetomir Stoyanov (VMware)
2020-01-31 12:10 ` [PATCH v19 03/15] trace-cmd: Find and store pids of tasks, which run virtual CPUs of given VM Tzvetomir Stoyanov (VMware)
2020-02-27  4:13   ` Steven Rostedt
2020-02-27  8:30     ` Tzvetomir Stoyanov
2020-01-31 12:11 ` [PATCH v19 04/15] trace-cmd: Implement new API tracecmd_add_option_v() Tzvetomir Stoyanov (VMware)
2020-01-31 12:11 ` [PATCH v19 05/15] trace-cmd: Add new API to generate a unique ID of the tracing session Tzvetomir Stoyanov (VMware)
2020-01-31 12:11 ` [PATCH v19 06/15] trace-cmd: Store the session tracing ID in the trace.dat file Tzvetomir Stoyanov (VMware)
2020-01-31 12:11 ` [PATCH v19 07/15] trace-cmd: Add definitions of htonll() and ntohll() Tzvetomir Stoyanov (VMware)
2020-01-31 12:11 ` [PATCH v19 08/15] trace-cmd: Exchange tracing IDs between host and guest Tzvetomir Stoyanov (VMware)
2020-01-31 12:11 ` [PATCH v19 09/15] trace-cmd: Implement new option in trace.dat file: TRACECMD_OPTION_TIME_SHIFT Tzvetomir Stoyanov (VMware)
2020-02-27  3:49   ` Steven Rostedt
2020-01-31 12:11 ` [PATCH v19 10/15] trace-cmd: Add guest information in host's trace.dat file Tzvetomir Stoyanov (VMware)
2020-02-27  3:53   ` Steven Rostedt
2020-02-27  3:56   ` Steven Rostedt [this message]
2020-02-27  9:39     ` Tzvetomir Stoyanov
2020-01-31 12:11 ` [PATCH v19 11/15] trace-cmd: Add host trace clock as guest trace argument Tzvetomir Stoyanov (VMware)
2020-01-31 12:11 ` [PATCH v19 12/15] trace-cmd: Refactor few trace-cmd internal functions Tzvetomir Stoyanov (VMware)
2020-01-31 12:11 ` [PATCH v19 13/15] trace-cmd: Basic infrastructure for host - guest timestamp synchronization Tzvetomir Stoyanov (VMware)
2020-01-31 12:11 ` [PATCH v19 14/15] trace-cmd: [POC] PTP-like algorithm " Tzvetomir Stoyanov (VMware)
2020-01-31 12:11 ` [PATCH v19 15/15] trace-cmd: Debug scripts for " Tzvetomir Stoyanov (VMware)

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