linux-kernel - [PATCH v2 06/13] RISC-V: KVM: Don't setup SGEI for zero guest external interrupts

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Message-ID: <20241020194734.58686-7-apatel@ventanamicro.com>
Date: Mon, 21 Oct 2024 01:17:27 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <paul.walmsley@...ive.com>
Cc: Atish Patra <atishp@...shpatra.org>,
	Andrew Jones <ajones@...tanamicro.com>,
	Anup Patel <anup@...infault.org>,
	kvm@...r.kernel.org,
	kvm-riscv@...ts.infradead.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Anup Patel <apatel@...tanamicro.com>,
	Atish Patra <atishp@...osinc.com>
Subject: [PATCH v2 06/13] RISC-V: KVM: Don't setup SGEI for zero guest external interrupts

No need to setup SGEI local interrupt when there are zero guest
external interrupts (i.e. zero HW IMSIC guest files).

Signed-off-by: Anup Patel <apatel@...tanamicro.com>
Reviewed-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/kvm/aia.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/riscv/kvm/aia.c b/arch/riscv/kvm/aia.c
index 17ae4a7c0e94..8ffae0330c89 100644
--- a/arch/riscv/kvm/aia.c
+++ b/arch/riscv/kvm/aia.c
@@ -499,6 +499,10 @@ static int aia_hgei_init(void)
 			hgctrl->free_bitmap = 0;
 	}
 
+	/* Skip SGEI interrupt setup for zero guest external interrupts */
+	if (!kvm_riscv_aia_nr_hgei)
+		goto skip_sgei_interrupt;
+
 	/* Find INTC irq domain */
 	domain = irq_find_matching_fwnode(riscv_get_intc_hwnode(),
 					  DOMAIN_BUS_ANY);
@@ -522,11 +526,16 @@ static int aia_hgei_init(void)
 		return rc;
 	}
 
+skip_sgei_interrupt:
 	return 0;
 }
 
 static void aia_hgei_exit(void)
 {
+	/* Do nothing for zero guest external interrupts */
+	if (!kvm_riscv_aia_nr_hgei)
+		return;
+
 	/* Free per-CPU SGEI interrupt */
 	free_percpu_irq(hgei_parent_irq, &aia_hgei);
 }
-- 
2.43.0