From: Zhimin Feng <fengzhimin@bytedance.com>
To: x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: pbonzini@redhat.com, seanjc@google.com, vkuznets@redhat.com,
wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
hpa@zytor.com, fweisbec@gmail.com, zhouyibo@bytedance.com,
zhanghaozhong@bytedance.com,
Zhimin Feng <fengzhimin@bytedance.com>
Subject: [RFC: timer passthrough 7/9] KVM: vmx: save the initial value of host tscd
Date: Fri, 5 Feb 2021 18:03:15 +0800 [thread overview]
Message-ID: <20210205100317.24174-8-fengzhimin@bytedance.com> (raw)
In-Reply-To: <20210205100317.24174-1-fengzhimin@bytedance.com>
Record the host tscd value.
Signed-off-by: Zhimin Feng <fengzhimin@bytedance.com>
---
arch/x86/kvm/vmx/vmx.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index a12da3cef86d..98eca70d4251 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -251,8 +251,11 @@ static void vmx_host_timer_passth_init(void *junk)
{
struct timer_passth_info *local_timer_info;
int cpu = smp_processor_id();
+ u64 tscd;
local_timer_info = &per_cpu(passth_info, cpu);
+ rdmsrl(MSR_IA32_TSC_DEADLINE, tscd);
+ local_timer_info->host_tscd = tscd;
local_timer_info->curr_dev = per_cpu(tick_cpu_device, cpu).evtdev;
local_timer_info->orig_set_next_event =
local_timer_info->curr_dev->set_next_event;
@@ -266,6 +269,7 @@ static void vmx_host_timer_restore(void *junk)
local_timer_info = &per_cpu(passth_info, smp_processor_id());
local_timer_info->curr_dev->set_next_event =
local_timer_info->orig_set_next_event;
+ local_timer_info->host_tscd = 0;
}
#define L1D_CACHE_ORDER 4
--
2.11.0
next prev parent reply other threads:[~2021-02-05 10:08 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-05 10:03 [RESEND RFC: timer passthrough 0/9] Support timer passthrough for VM Zhimin Feng
2021-02-05 10:03 ` [RFC: timer passthrough 1/9] KVM: vmx: hook set_next_event for getting the host tscd Zhimin Feng
2021-02-05 12:28 ` Peter Zijlstra
2021-02-05 18:11 ` Thomas Gleixner
2021-02-23 13:07 ` [External] " Zhimin Feng
2021-02-05 10:03 ` [RFC: timer passthrough 2/9] KVM: vmx: enable host lapic timer offload preemtion timer Zhimin Feng
2021-02-05 10:03 ` [RFC: timer passthrough 3/9] KVM: vmx: enable passthrough timer to guest Zhimin Feng
2021-02-05 10:03 ` [RFC: timer passthrough 4/9] KVM: vmx: enable passth timer switch to sw timer Zhimin Feng
2021-02-05 10:03 ` [RFC: timer passthrough 5/9] KVM: vmx: use tsc_adjust to enable tsc_offset timer passthrough Zhimin Feng
2021-02-05 12:43 ` Peter Zijlstra
2021-02-05 18:22 ` Thomas Gleixner
2021-02-05 10:03 ` [RFC: timer passthrough 6/9] KVM: vmx: check enable_timer_passth strictly Zhimin Feng
2021-02-05 10:03 ` Zhimin Feng [this message]
2021-02-05 10:03 ` [RFC: timer passthrough 8/9] KVM: vmx: Dynamically open or close the timer-passthrough for pre-vm Zhimin Feng
2021-02-05 10:03 ` [RFC: timer passthrough 9/9] KVM: vmx: query the state of timer-passth for vm Zhimin Feng
2021-02-05 13:34 ` [RESEND RFC: timer passthrough 0/9] Support timer passthrough for VM Paolo Bonzini
2021-02-08 18:13 ` Konrad Rzeszutek Wilk
2021-02-23 13:31 ` [External] " Zhimin Feng
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