Minor comment inline.
--
Horms
H: http://www.vergenet.net/~horms/
W: http://www.valinux.co.jp/en/
On Mon, 10 Jul 2006 14:54:21 +0800, Yang, Xiaowei wrote:
> [-- text/plain, encoding quoted-printable, charset: us-ascii, 11 lines --]
>
> Keir,
> This patch fixes "Many lost ticks" warning in ia32e guest.
> New i8254.c code in HV has some problem calculating PIT counter. So when
> guest kernel reads it and uses it to adjust last_tsc when PIT is
> generated, it may think there are more than two ticks of time passed
> between 2 continuous PIT, which ended up with "Warning: Many lost
> ticks".
>
> Thanks,
> Xiaowei
>
>
> Fix "Many lost ticks" warning in ia32e guest
>
> Signed-off-by: Eddie Dong <eddie.dong@xxxxxxxxx>
> Signed-off-by: Xiaowei Yang <xiaowei.yang@xxxxxxxxx>
>
> diff -r fd6d12935b56 xen/arch/x86/hvm/i8254.c
> --- a/xen/arch/x86/hvm/i8254.c Mon Jul 3 15:07:20 2006
> +++ b/xen/arch/x86/hvm/i8254.c Mon Jul 10 11:23:14 2006
> @@ -188,6 +188,12 @@
> return s->gate;
> }
>
> +void pit_time_fired(struct vcpu *v, void *priv)
> +{
> + PITChannelState *s = priv;
> + s->count_load_time = hvm_get_clock(v);
> +}
> +
> static inline void pit_load_count(PITChannelState *s, int val)
> {
> u32 period;
> @@ -209,11 +215,11 @@
> switch (s->mode) {
> case 2:
> /* create periodic time */
> - s->pt = create_periodic_time (s->vcpu, period, 0, 0);
> + s->pt = create_periodic_time (s, period, 0, 0);
> break;
> case 1:
> /* create one shot time */
> - s->pt = create_periodic_time (s->vcpu, period, 0, 1);
> + s->pt = create_periodic_time (s, period, 0, 1);
> #ifdef DEBUG_PIT
> printk("HVM_PIT: create one shot time.\n");
> #endif
> diff -r fd6d12935b56 xen/arch/x86/hvm/intercept.c
> --- a/xen/arch/x86/hvm/intercept.c Mon Jul 3 15:07:20 2006
> +++ b/xen/arch/x86/hvm/intercept.c Mon Jul 10 11:23:14 2006
> @@ -261,11 +261,12 @@
> * period: fire frequency in ns.
> */
> struct periodic_time * create_periodic_time(
> - struct vcpu *v,
> + PITChannelState *s,
> u32 period,
> char irq,
> char one_shot)
> {
> + struct vcpu *v = s->vcpu;
> struct periodic_time *pt =
> &(v->domain->arch.hvm_domain.pl_time.periodic_tm);
> if ( pt->enabled ) {
> if ( v->vcpu_id != 0 ) {
> @@ -290,6 +291,7 @@
> pt->scheduled = NOW() + period;
> set_timer (&pt->timer,pt->scheduled);
> pt->enabled = 1;
> + pt->priv = s;
> return pt;
> }
>
> diff -r fd6d12935b56 xen/arch/x86/hvm/vmx/io.c
> --- a/xen/arch/x86/hvm/vmx/io.c Mon Jul 3 15:07:20 2006
> +++ b/xen/arch/x86/hvm/vmx/io.c Mon Jul 10 11:23:14 2006
> @@ -75,6 +75,7 @@
> pt->pending_intr_nr--;
> pt->last_plt_gtime += pt->period_cycles;
> set_guest_time(v, pt->last_plt_gtime);
> + pit_time_fired(v, pt->priv);
> }
> }
>
> diff -r fd6d12935b56 xen/include/asm-x86/hvm/vpit.h
> --- a/xen/include/asm-x86/hvm/vpit.h Mon Jul 3 15:07:20 2006
> +++ b/xen/include/asm-x86/hvm/vpit.h Mon Jul 10 11:23:14 2006
> @@ -64,6 +64,7 @@
> s_time_t scheduled; /* scheduled timer interrupt */
> u64 last_plt_gtime; /* platform time when last IRQ is injected */
> struct timer timer; /* ac_timer */
> + void *priv; /* ponit back to platform time source */
> };
>
> typedef struct PITState {
> @@ -93,9 +94,10 @@
> extern void hvm_hooks_assist(struct vcpu *v);
> extern void pickup_deactive_ticks(struct periodic_time *vpit);
> extern u64 hvm_get_guest_time(struct vcpu *v);
> -extern struct periodic_time *create_periodic_time(struct vcpu *v, u32
> period, char irq, char one_shot);
> +extern struct periodic_time *create_periodic_time(PITChannelState *v, u32
> period, char irq, char one_shot);
Could this line be <=80 characters wide?
> extern void destroy_periodic_time(struct periodic_time *pt);
> void pit_init(struct vcpu *v, unsigned long cpu_khz);
> void pt_timer_fn(void *data);
> +void pit_time_fired(struct vcpu *v, void *priv);
>
> #endif /* __ASM_X86_HVM_VPIT_H__ */
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