Re: [Xen-devel] [PATCH V2 1/2] tests/xen-access: disable CR4 write events on application exit

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

On 01/30/2018 11:16 AM, Razvan Cojocaru wrote:
> On exit, xen-access did not unsubscribe from CR4 write vm_events,
> potentially leaving the guest stuck.
> 
> Signed-off-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
> ---
>  tools/tests/xen-access/xen-access.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/tests/xen-access/xen-access.c 
> b/tools/tests/xen-access/xen-access.c
> index 9d960e2..c572550 100644
> --- a/tools/tests/xen-access/xen-access.c
> +++ b/tools/tests/xen-access/xen-access.c
> @@ -654,6 +654,8 @@ int main(int argc, char *argv[])
>                  rc = xc_monitor_cpuid(xch, domain_id, 0);
>              if ( desc_access )
>                  rc = xc_monitor_descriptor_access(xch, domain_id, 0);
> +            if ( write_ctrlreg_cr4 )
> +                rc = xc_monitor_write_ctrlreg(xch, domain_id, 
> VM_EVENT_X86_CR4, 0, 1, 0, 1);
>  
>              if ( privcall )
>                  rc = xc_monitor_privileged_call(xch, domain_id, 0);
> 

Sorry for this, I've obviously used the wrong branch. Please ignore this
patch - only "[PATCH V2 2/2] x86/hvm: fix domain crash when CR3 has the
noflush bit set" is relevant.


Thanks,
Razvan

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