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Re: [Xen-devel] [PATCH 09/13] x86/time.c: Scale host TSC in pvclock properly
- To: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxx
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Date: Mon, 28 Sep 2015 12:36:51 -0400
- Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Ian Campbell <ian.campbell@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Aravind Gopalakrishnan <Aravind.Gopalakrishnan@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Keir Fraser <keir@xxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
- Delivery-date: Mon, 28 Sep 2015 16:38:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On 09/28/2015 03:13 AM, Haozhong Zhang wrote:
This patch makes the pvclock return the scaled host TSC and
corresponding scaling parameters to HVM domains if guest TSC is not
emulated and TSC scaling is enabled.
Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
---
xen/arch/x86/time.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index 4b5402c..54eab6e 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -832,10 +832,19 @@ static void __update_vcpu_system_time(struct vcpu *v, int
force)
}
else
{
- _u.tsc_timestamp = t->local_tsc_stamp;
+ if ( is_hvm_domain(d) && hvm_funcs.tsc_scaling_supported )
This should probably be has_hvm_container_domain(d).
And I think you also may need to adjust this in patch 4 (tsc_set_info()).
-boris
+ {
+ _u.tsc_timestamp = hvm_scale_tsc(v, t->local_tsc_stamp);
+ _u.tsc_to_system_mul = d->arch.vtsc_to_ns.mul_frac;
+ _u.tsc_shift = d->arch.vtsc_to_ns.shift;
+ }
+ else
+ {
+ _u.tsc_timestamp = t->local_tsc_stamp;
+ _u.tsc_to_system_mul = t->tsc_scale.mul_frac;
+ _u.tsc_shift = (s8)t->tsc_scale.shift;
+ }
_u.system_time = t->stime_local_stamp;
- _u.tsc_to_system_mul = t->tsc_scale.mul_frac;
- _u.tsc_shift = (s8)t->tsc_scale.shift;
}
if ( is_hvm_domain(d) )
_u.tsc_timestamp += v->arch.hvm_vcpu.cache_tsc_offset;
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