Re: [PATCH v5 11/11] tools/proctrace: add proctrace tool

[Michał Leszczyński <michal.leszczynski@xxxxxxx>]

----- 5 lip 2020 o 20:55, Michał Leszczyński michal.leszczynski@xxxxxxx 
napisał(a):

> From: Michal Leszczynski <michal.leszczynski@xxxxxxx>
> 
> Add an demonstration tool that uses xc_vmtrace_* calls in order
> to manage external IPT monitoring for DomU.
> 
> Signed-off-by: Michal Leszczynski <michal.leszczynski@xxxxxxx>
> ---
> tools/proctrace/Makefile    |  48 +++++++++++
> tools/proctrace/proctrace.c | 163 ++++++++++++++++++++++++++++++++++++
> 2 files changed, 211 insertions(+)
> create mode 100644 tools/proctrace/Makefile
> create mode 100644 tools/proctrace/proctrace.c


> diff --git a/tools/proctrace/proctrace.c b/tools/proctrace/proctrace.c
> new file mode 100644
> index 0000000000..22bf91db8d
> --- /dev/null
> +++ b/tools/proctrace/proctrace.c


> +#include <stdlib.h>
> +#include <stdio.h>
> +#include <sys/mman.h>
> +#include <signal.h>
> +
> +#include <xenctrl.h>
> +#include <xen/xen.h>
> +#include <xenforeignmemory.h>
> +
> +#define BUF_SIZE (16384 * XC_PAGE_SIZE)


I would like to discuss here, how we should retrieve the trace buffer size
in runtime? Should there be a hypercall for it, or some extension to
acquire_resource logic?

Best regards,
Michał Leszczyński
CERT Polska