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Date: Thu, 11 Mar 2010 12:55:50 -0800
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Stefano Stabellini <stefano.stabellini@...citrix.com>
CC: "xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 4 of 5] evtchn delivery on HVM
On 03/10/2010 07:47 AM, Stefano Stabellini wrote:
> Hi all,
> this patch sets the callback to receive evtchns from Xen, using the
> callback vector delivery mechanism.
>
Please see my comments on Sheng's version of this patch and his updates,
specifically regarding the xen_hvm_domain() tests in xen_evtchn_do_upcall().
Thanks,
J
> Signed-off-by: Stefano Stabellini<stefano.stabellini@...citrix.com>
> Signed-off-by: Sheng Yang<sheng@...ux.intel.com>
>
> ---
>
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index 6292cc6..72e8546 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -34,8 +34,11 @@
> #include<xen/interface/vcpu.h>
> #include<xen/interface/memory.h>
> #include<xen/interface/hvm/hvm_op.h>
> +#include<xen/interface/hvm/params.h>
> #include<xen/features.h>
> #include<xen/page.h>
> +#include<xen/hvm.h>
> +#include<xen/events.h>
> #include<xen/hvc-console.h>
>
> #include<asm/paravirt.h>
> @@ -1267,9 +1270,25 @@ static void __init init_pv_clocksource(void)
> xen_register_clocksource();
> }
>
> +static int set_callback_via(uint64_t via)
> +{
> + struct xen_hvm_param a;
> +
> + a.domid = DOMID_SELF;
> + a.index = HVM_PARAM_CALLBACK_IRQ;
> + a.value = via;
> + return HYPERVISOR_hvm_op(HVMOP_set_param,&a);
> +}
> +
> +void do_hvm_pv_evtchn_intr(void)
> +{
> + xen_evtchn_do_upcall(get_irq_regs());
> +}
> +
> void __init xen_guest_init(void)
> {
> int r;
> + uint64_t callback_via;
>
> r = init_hvm_pv_info();
> if (r< 0)
> @@ -1277,5 +1296,14 @@ void __init xen_guest_init(void)
>
> init_shared_info();
> init_pv_clocksource();
> +
> + callback_via = HVM_CALLBACK_VECTOR(GENERIC_INTERRUPT_VECTOR);
> + set_callback_via(callback_via);
> + generic_interrupt_extension = do_hvm_pv_evtchn_intr;
> +
> + have_vcpu_info_placement = 0;
> + x86_init.irqs.intr_init = xen_init_IRQ;
> + pv_time_ops = xen_time_ops;
> + machine_ops = xen_machine_ops;
> }
>
> diff --git a/drivers/xen/events.c b/drivers/xen/events.c
> index 2f57276..ef25a53 100644
> --- a/drivers/xen/events.c
> +++ b/drivers/xen/events.c
> @@ -621,9 +621,10 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
> struct vcpu_info *vcpu_info = __get_cpu_var(xen_vcpu);
> unsigned count;
>
> - exit_idle();
> - irq_enter();
> -
> + if (!xen_hvm_domain()) {
> + exit_idle();
> + irq_enter();
> + }
> do {
> unsigned long pending_words;
>
> @@ -659,8 +660,10 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
> } while(count != 1);
>
> out:
> - irq_exit();
> - set_irq_regs(old_regs);
> + if (!xen_hvm_domain()) {
> + irq_exit();
> + set_irq_regs(old_regs);
> + }
>
> put_cpu();
> }
> @@ -939,5 +942,8 @@ void __init xen_init_IRQ(void)
> for (i = 0; i< NR_EVENT_CHANNELS; i++)
> mask_evtchn(i);
>
> - irq_ctx_init(smp_processor_id());
> + if (xen_hvm_domain())
> + native_init_IRQ();
> + else
> + irq_ctx_init(smp_processor_id());
> }
> diff --git a/include/xen/events.h b/include/xen/events.h
> index e68d59a..b0d3b3c 100644
> --- a/include/xen/events.h
> +++ b/include/xen/events.h
> @@ -56,4 +56,6 @@ void xen_poll_irq(int irq);
> /* Determine the IRQ which is bound to an event channel */
> unsigned irq_from_evtchn(unsigned int evtchn);
>
> +void xen_evtchn_do_upcall(struct pt_regs *regs);
> +
> #endif /* _XEN_EVENTS_H */
> diff --git a/include/xen/hvm.h b/include/xen/hvm.h
> index c2a55f6..35c9c11 100644
> --- a/include/xen/hvm.h
> +++ b/include/xen/hvm.h
> @@ -3,6 +3,7 @@
> #define XEN_HVM_H__
>
> #include<xen/interface/hvm/params.h>
> +#include<asm/xen/hypercall.h>
>
> static inline unsigned long hvm_get_parameter(int idx)
> {
> @@ -20,4 +21,9 @@ static inline unsigned long hvm_get_parameter(int idx)
> return xhv.value;
> }
>
> +#define HVM_CALLBACK_VIA_TYPE_VECTOR 0x2
> +#define HVM_CALLBACK_VIA_TYPE_SHIFT 56
> +#define HVM_CALLBACK_VECTOR(x) (((uint64_t)HVM_CALLBACK_VIA_TYPE_VECTOR)<<\
> + HVM_CALLBACK_VIA_TYPE_SHIFT | (x))
> +
> #endif /* XEN_HVM_H__ */
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@...ts.xensource.com
> http://lists.xensource.com/xen-devel
>
>
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