Re: [Xen-devel] [PATCH v3 3/9] monitor: ARM SMC events

[Julien Grall <julien.grall@xxxxxxx>]

Hi Tamas,

On 04/05/16 15:51, Tamas K Lengyel wrote:
> Add support for monitoring ARM SMC events. This patch only adds the required
> bits to enable/disable monitoring and forwarding the event through vm_event.
>
> Signed-off-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
> ---
> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> Cc: Julien Grall <julien.grall@xxxxxxx>
> Cc: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
>
> v3: Split parts off as separate patches
>      Union for arm32/64 register structs in vm_event
>      Cosmetic fixes
> ---
>   xen/arch/arm/monitor.c        | 49 +++++++++++++++++++++++++++++++++++++++++++
>   xen/arch/arm/traps.c          | 16 ++++++++++++--
>   xen/include/asm-arm/domain.h  |  5 +++++
>   xen/include/asm-arm/monitor.h | 24 ++++++---------------
>   xen/include/public/domctl.h   |  1 +
>   xen/include/public/vm_event.h |  2 ++
>   6 files changed, 77 insertions(+), 20 deletions(-)
>
> diff --git a/xen/arch/arm/monitor.c b/xen/arch/arm/monitor.c
> index f957257..9c481ac 100644
> --- a/xen/arch/arm/monitor.c
> +++ b/xen/arch/arm/monitor.c
> @@ -22,6 +22,55 @@
>   #include <asm/vm_event.h>
>   #include <public/vm_event.h>
>
> +int arch_monitor_domctl_event(struct domain *d,
> +                              struct xen_domctl_monitor_op *mop)
> +{
> +    struct arch_domain *ad = &d->arch;
> +    bool_t requested_status = (XEN_DOMCTL_MONITOR_OP_ENABLE == mop->op);
> +
> +    switch ( mop->event )
> +    {
> +    case XEN_DOMCTL_MONITOR_EVENT_PRIVILEGED_CALL:
> +    {
> +        bool_t old_status = ad->monitor.privileged_call_enabled;
> +
> +        if ( unlikely(old_status == requested_status) )
> +            return -EEXIST;
> +
> +        domain_pause(d);
> +        ad->monitor.privileged_call_enabled = requested_status;
> +        domain_unpause(d);
> +        break;
> +    }
> +
> +    default:
> +        /*
> +         * Should not be reached unless arch_monitor_get_capabilities() is
> +         * not properly implemented.
> +         */
> +        ASSERT_UNREACHABLE();
> +        return -EOPNOTSUPP;
> +    }
> +
> +    return 0;
> +}
> +
> +bool_t monitor_smc(const struct cpu_user_regs *regs) {
Coding style, the brace should be on a separate line.

> +    struct vcpu *curr = current;
> +    vm_event_request_t req = { 0 };
> +
> +    if ( !curr->domain->arch.monitor.privileged_call_enabled )
> +        return 0;
> +
> +    req.reason = VM_EVENT_REASON_PRIVILEGED_CALL;
> +    req.vcpu_id = curr->vcpu_id;
> +
> +    if ( vm_event_monitor_traps(curr, 1, &req) <= 0 )
> +        return 0;
> +    else
> +        return 1;
> +}
> +
>   void monitor_guest_request(void)
>   {
>       struct vcpu *curr = current;
> diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
> index 9abfc3c..f26e12e 100644
> --- a/xen/arch/arm/traps.c
> +++ b/xen/arch/arm/traps.c
> @@ -41,6 +41,7 @@
>   #include <asm/mmio.h>
>   #include <asm/cpufeature.h>
>   #include <asm/flushtlb.h>
> +#include <asm/monitor.h>
>
>   #include "decode.h"
>   #include "vtimer.h"
> @@ -2491,6 +2492,17 @@ bad_data_abort:
>       inject_dabt_exception(regs, info.gva, hsr.len);
>   }
>
> +static void do_trap_smc(struct cpu_user_regs *regs, const union hsr hsr)
> +{
> +    bool_t handled = 0;
> +
> +    if ( current->domain->arch.monitor.privileged_call_enabled )
> +        handled = monitor_smc(regs);
> +
> +    if ( handled != 1 )
handled is a boolean. So if ( !handled )

Regards,

--
Julien Grall

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