linux-kernel - [PATCH v3 11/11] KVM: X86: Use common code for PV IPIs in linux guest

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Date: Fri, 28 Jun 2024 13:18:39 -0700
From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
To: X86 Kernel <x86@...nel.org>,
	Sean Christopherson <seanjc@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Hansen <dave.hansen@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Ingo Molnar" <mingo@...hat.com>,
	"Borislav Petkov" <bp@...en8.de>,
	"Xin Li" <xin3.li@...el.com>,
	linux-perf-users@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
	Tony Luck <tony.luck@...el.com>,
	Andy Lutomirski <luto@...nel.org>,
	acme@...nel.org,
	kan.liang@...ux.intel.com,
	Andi Kleen <andi.kleen@...el.com>,
	"Mehta, Sohil" <sohil.mehta@...el.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	Zeng Guang <guang.zeng@...el.com>
Subject: [PATCH v3 11/11] KVM: X86: Use common code for PV IPIs in linux guest

Paravirtual apic hooks to enable PV IPIs for KVM if the "send IPI"
hypercall is available. Reuse common code for ICR preparation which
covers NMI-source reporting if in effect.

Originally-by: Zeng Guang <guang.zeng@...el.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 arch/x86/kernel/kvm.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 263f8aed4e2c..a45d60aa0302 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -516,15 +516,7 @@ static void __send_ipi_mask(const struct cpumask *mask, int vector)
 
 	local_irq_save(flags);
 
-	switch (vector) {
-	default:
-		icr = APIC_DM_FIXED | vector;
-		break;
-	case NMI_VECTOR:
-		icr = APIC_DM_NMI;
-		break;
-	}
-
+	icr = __prepare_ICR(0, vector, 0);
 	for_each_cpu(cpu, mask) {
 		apic_id = per_cpu(x86_cpu_to_apicid, cpu);
 		if (!ipi_bitmap) {
-- 
2.25.1