linux-kernel - [RFC PATCH v2 4/7] x86/paravirt: Add update in x86/paravirt pv_idle

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Message-Id: <1504007201-12904-5-git-send-email-yang.zhang.wz@gmail.com>
Date:   Tue, 29 Aug 2017 11:46:38 +0000
From:   Yang Zhang <yang.zhang.wz@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     kvm@...r.kernel.org, wanpeng.li@...mail.com, mst@...hat.com,
        pbonzini@...hat.com, tglx@...utronix.de, rkrcmar@...hat.com,
        dmatlack@...gle.com, agraf@...e.de, peterz@...radead.org,
        linux-doc@...r.kernel.org, Yang Zhang <yang.zhang.wz@...il.com>,
        Quan Xu <quan.xu0@...il.com>,
        Jeremy Fitzhardinge <jeremy@...p.org>,
        Chris Wright <chrisw@...s-sol.org>,
        Alok Kataria <akataria@...are.com>,
        Rusty Russell <rusty@...tcorp.com.au>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>,
        Kees Cook <keescook@...omium.org>,
        virtualization@...ts.linux-foundation.org
Subject: [RFC PATCH v2 4/7] x86/paravirt: Add update in x86/paravirt pv_idle_ops

.update is used to adjust the next poll time.

Signed-off-by: Yang Zhang <yang.zhang.wz@...il.com>
Signed-off-by: Quan Xu <quan.xu0@...il.com>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>
Cc: Chris Wright <chrisw@...s-sol.org>
Cc: Alok Kataria <akataria@...are.com>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: virtualization@...ts.linux-foundation.org
Cc: linux-kernel@...r.kernel.org
---
 arch/x86/include/asm/paravirt.h       | 5 +++++
 arch/x86/include/asm/paravirt_types.h | 1 +
 arch/x86/kernel/paravirt.c            | 1 +
 3 files changed, 7 insertions(+)

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 6d46760..32e1c06 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -207,6 +207,11 @@ static inline void paravirt_idle_poll(void)
 	PVOP_VCALL0(pv_idle_ops.poll);
 }
 
+static inline void paravirt_idle_update_poll_duration(unsigned long duration)
+{
+	PVOP_VCALL1(pv_idle_ops.update, duration);
+}
+
 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
 {
 	PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index cf45726..3b4f95a 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -326,6 +326,7 @@ struct pv_lock_ops {
 
 struct pv_idle_ops {
 	void (*poll)(void);
+	void (*update)(unsigned long);
 } __no_randomize_layout;
 
 /* This contains all the paravirt structures: we get a convenient
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 1b5b247..a11b2c2 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -315,6 +315,7 @@ struct pv_time_ops pv_time_ops = {
 
 struct pv_idle_ops pv_idle_ops = {
 	.poll = paravirt_nop,
+	.update = paravirt_nop,
 };
 
 __visible struct pv_irq_ops pv_irq_ops = {
-- 
1.8.3.1