linux-kernel - [PATCH v2] KVM: X86: Use IPI shorthands in kvm guest when support

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Message-Id: <1564452945-18425-1-git-send-email-wanpengli@tencent.com>
Date:   Tue, 30 Jul 2019 10:15:45 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Nadav Amit <namit@...are.com>
Subject: [PATCH v2] KVM: X86: Use IPI shorthands in kvm guest when support

From: Wanpeng Li <wanpengli@...cent.com>

IPI shorthand is supported now by linux apic/x2apic driver, switch to 
IPI shorthand for all excluding self and all including self destination 
shorthand in kvm guest, to avoid splitting the target mask into several 
PV IPI hypercalls. This patch removes the kvm_send_ipi_all() and 
kvm_send_ipi_allbutself() since the callers in APIC codes have already 
taken care of apic_use_ipi_shorthand and fallback to ->send_IPI_mask
and ->send_IPI_mask_allbutself if it is false.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Sean Christopherson <sean.j.christopherson@...el.com>
Cc: Nadav Amit <namit@...are.com>
Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
---
Note: rebase against tip tree's x86/apic branch
v1 -> v2:
 * remove kvm_send_ipi_all() and kvm_send_ipi_allbutself()

 arch/x86/kernel/kvm.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index b7f34fe..96626d8 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -505,16 +505,6 @@ static void kvm_send_ipi_mask_allbutself(const struct cpumask *mask, int vector)
 	__send_ipi_mask(local_mask, vector);
 }
 
-static void kvm_send_ipi_allbutself(int vector)
-{
-	kvm_send_ipi_mask_allbutself(cpu_online_mask, vector);
-}
-
-static void kvm_send_ipi_all(int vector)
-{
-	__send_ipi_mask(cpu_online_mask, vector);
-}
-
 /*
  * Set the IPI entry points
  */
@@ -522,8 +512,6 @@ static void kvm_setup_pv_ipi(void)
 {
 	apic->send_IPI_mask = kvm_send_ipi_mask;
 	apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself;
-	apic->send_IPI_allbutself = kvm_send_ipi_allbutself;
-	apic->send_IPI_all = kvm_send_ipi_all;
 	pr_info("KVM setup pv IPIs\n");
 }
 
-- 
2.7.4