Re: [Xen-devel] [PATCH v4 3/3] x86/viridian: implement the crash MSRs

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Paul Durrant [mailto:paul.durrant@xxxxxxxxxx]
> Sent: 22 March 2017 12:15
> To: xen-devel@xxxxxxxxxxxxxxxxxxxx
> Cc: Paul Durrant <Paul.Durrant@xxxxxxxxxx>; Ian Jackson
> <Ian.Jackson@xxxxxxxxxx>; Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
> Subject: [PATCH v4 3/3] x86/viridian: implement the crash MSRs
> 
> Section 2.4.4 of the Hypervisor Top Level Functional Specification states
> that enabling bit 10 in EDX of CPUID leaf 3 advertises to Windows a set
> of MSRs into which it can write crash information.
> 
> This patch advertises that bit and implements the MSRs such that Xen can
> log the information if a Windows guest crashes.
> 
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> ---
> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Cc: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> 
> v4:
>  - Name the union in HV_CRASH_CTL_REG_CONTENTS to keep older gcc
> happy
> 
> v3:
>  - Use WARNING level message rather than INFO
> 
> v2:
>  - Make MSRs per-vcpu rather than per-domain
>  - Fix hypervisor stack leak
>  - Replicate BUILD_BOG_ON()
>  - Use gprintk() rather than printk()
> ---
>  docs/man/xl.cfg.pod.5.in           | 10 ++++--
>  tools/libxl/libxl.h                |  6 ++++
>  tools/libxl/libxl_dom.c            |  4 +++
>  tools/libxl/libxl_types.idl        |  1 +
>  xen/arch/x86/hvm/viridian.c        | 69
> ++++++++++++++++++++++++++++++++++++++
>  xen/include/asm-x86/hvm/viridian.h |  1 +
>  xen/include/public/hvm/params.h    |  7 +++-
>  7 files changed, 95 insertions(+), 3 deletions(-)
> 
> diff --git a/docs/man/xl.cfg.pod.5.in b/docs/man/xl.cfg.pod.5.in
> index 52802d5..991960b 100644
> --- a/docs/man/xl.cfg.pod.5.in
> +++ b/docs/man/xl.cfg.pod.5.in
> @@ -1601,11 +1601,17 @@ per-vcpu event channel upcall vectors.
>  Note that this enlightenment will have no effect if the guest is
>  using APICv posted interrupts.
> 
> +=item B<crash_ctl>
> +
> +This group incorporates the crash control MSRs. These enlightenments
> +allow Windows to write crash information such that it can be logged
> +by Xen.
> +
>  =item B<defaults>
> 
>  This is a special value that enables the default set of groups, which
> -is currently the B<base>, B<freq>, B<time_ref_count> and B<apic_assist>
> -groups.
> +is currently the B<base>, B<freq>, B<time_ref_count>, B<apic_assist>
> +and B<crash_ctl> groups.
> 
>  =item B<all>
> 
> diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
> index 72ec39d..af45582 100644
> --- a/tools/libxl/libxl.h
> +++ b/tools/libxl/libxl.h
> @@ -288,6 +288,12 @@
>  #define LIBXL_HAVE_SCHED_CREDIT2_PARAMS 1
> 
>  /*
> + * LIBXL_HAVE_CRASH_CTL indicates that the 'crash_ctl' value
> + * is present in the viridian enlightenment enumeration.
> + */
> +#define LIBXL_HAVE_CRASH_CTL 1

Sorry, I forgot to fix this up. Can this be done at commit assuming the rest of 
the patch is now ok?

  Paul

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