Re: [PATCH] vmx/monitor: CPUID events

[Razvan Cojocaru <rcojocaru@bitdefender.com>]

On 07/08/16 05:31, Tamas K Lengyel wrote:
> This patch implements sending notification to a monitor subscriber when an
> x86/vmx guest executes the CPUID instruction.
> 
> Signed-off-by: Tamas K Lengyel <tamas.lengyel@zentific.com>
> ---
> Cc: Ian Jackson <ian.jackson@eu.citrix.com>
> Cc: Wei Liu <wei.liu2@citrix.com>
> Cc: Razvan Cojocaru <rcojocaru@bitdefender.com>
> Cc: Jan Beulich <jbeulich@suse.com>
> Cc: Andrew Cooper <andrew.cooper3@citrix.com>
> Cc: Jun Nakajima <jun.nakajima@intel.com>
> Cc: Kevin Tian <kevin.tian@intel.com>
> ---
>  tools/libxc/include/xenctrl.h       |  1 +
>  tools/libxc/xc_monitor.c            | 13 +++++++++++++
>  tools/tests/xen-access/xen-access.c | 33 ++++++++++++++++++++++++++++++++-
>  xen/arch/x86/hvm/monitor.c          | 16 ++++++++++++++++
>  xen/arch/x86/hvm/vmx/vmx.c          | 23 +++++++++++++++++++----
>  xen/arch/x86/monitor.c              | 13 +++++++++++++
>  xen/include/asm-x86/domain.h        |  1 +
>  xen/include/asm-x86/hvm/monitor.h   |  1 +
>  xen/include/asm-x86/monitor.h       |  3 ++-
>  xen/include/public/domctl.h         |  1 +
>  xen/include/public/vm_event.h       |  8 ++++++++
>  11 files changed, 107 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
> index 4a85b4a..e904bd5 100644
> --- a/tools/libxc/include/xenctrl.h
> +++ b/tools/libxc/include/xenctrl.h
> @@ -2167,6 +2167,7 @@ int xc_monitor_guest_request(xc_interface *xch, domid_t domain_id,
>                               bool enable, bool sync);
>  int xc_monitor_debug_exceptions(xc_interface *xch, domid_t domain_id,
>                                  bool enable, bool sync);
> +int xc_monitor_cpuid(xc_interface *xch, domid_t domain_id, bool enable);
>  /**
>   * This function enables / disables emulation for each REP for a
>   * REP-compatible instruction.
> diff --git a/tools/libxc/xc_monitor.c b/tools/libxc/xc_monitor.c
> index 264992c..4298813 100644
> --- a/tools/libxc/xc_monitor.c
> +++ b/tools/libxc/xc_monitor.c
> @@ -172,6 +172,19 @@ int xc_monitor_debug_exceptions(xc_interface *xch, domid_t domain_id,
>      return do_domctl(xch, &domctl);
>  }
>  
> +int xc_monitor_cpuid(xc_interface *xch, domid_t domain_id, bool enable)
> +{
> +    DECLARE_DOMCTL;
> +
> +    domctl.cmd = XEN_DOMCTL_monitor_op;
> +    domctl.domain = domain_id;
> +    domctl.u.monitor_op.op = enable ? XEN_DOMCTL_MONITOR_OP_ENABLE
> +                                    : XEN_DOMCTL_MONITOR_OP_DISABLE;
> +    domctl.u.monitor_op.event = XEN_DOMCTL_MONITOR_EVENT_CPUID;
> +
> +    return do_domctl(xch, &domctl);
> +}
> +
>  /*
>   * Local variables:
>   * mode: C
> diff --git a/tools/tests/xen-access/xen-access.c b/tools/tests/xen-access/xen-access.c
> index 02655d5..d525b82 100644
> --- a/tools/tests/xen-access/xen-access.c
> +++ b/tools/tests/xen-access/xen-access.c
> @@ -337,7 +337,7 @@ void usage(char* progname)
>  {
>      fprintf(stderr, "Usage: %s [-m] <domain_id> write|exec", progname);
>  #if defined(__i386__) || defined(__x86_64__)
> -            fprintf(stderr, "|breakpoint|altp2m_write|altp2m_exec|debug");
> +            fprintf(stderr, "|breakpoint|altp2m_write|altp2m_exec|debug|cpuid");
>  #endif
>              fprintf(stderr,
>              "\n"
> @@ -364,6 +364,7 @@ int main(int argc, char *argv[])
>      int shutting_down = 0;
>      int altp2m = 0;
>      int debug = 0;
> +    int cpuid = 1;

Should this be on by default? All the rest of the options are 0, and ...

>      uint16_t altp2m_view_id = 0;
>  
>      char* progname = argv[0];
> @@ -426,6 +427,10 @@ int main(int argc, char *argv[])
>      {
>          debug = 1;
>      }
> +    else if ( !strcmp(argv[0], "cpuid") )
> +    {
> +        cpuid = 1;
> +    }
>  #endif

... you also set it to 1 here.


Thanks,
Razvan

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