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

Anup Patel
2024-07-19T16:09:46Z

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@ventanamicro.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);
}
--
2.34.1