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RISC-V: KVM: Don't setup SGEI for zero guest external interrupts

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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>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20241020194734.58686-7-apatel@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel 2024-10-21 01:17:27 +05:30 committed by Anup Patel
parent 5d8f7ee928
commit 15ff2ff3c3
1 changed files with 9 additions and 0 deletions
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9
arch/riscv/kvm/aia.c
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@ -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);
}