linux-kernel - [PATCH] PCI: hv: Use nested hypercall for retargeting interrupts

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Date:   Tue,  4 Apr 2023 11:35:46 +0000
From:   Jinank Jain <jinankjain@...ux.microsoft.com>
To:     jinankjain@...rosoft.com, kys@...rosoft.com,
        haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
        lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org,
        bhelgaas@...gle.com
Cc:     linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, nunodasneves@...ux.microsoft.com
Subject: [PATCH] PCI: hv: Use nested hypercall for retargeting interrupts

In case of nested MSHV, retargeting interrupt hypercall should be sent
to L0 hypervisor instead of L1 hypervisor.

Signed-off-by: Jinank Jain <jinankjain@...ux.microsoft.com>
---
 drivers/pci/controller/pci-hyperv.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index f33370b75628..2123f632ecf7 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -704,8 +704,14 @@ static void hv_arch_irq_unmask(struct irq_data *data)
 		}
 	}
 
-	res = hv_do_hypercall(HVCALL_RETARGET_INTERRUPT | (var_size << 17),
-			      params, NULL);
+	if (hv_nested)
+		res = hv_do_nested_hypercall(HVCALL_RETARGET_INTERRUPT |
+					     (var_size << 17),
+					     params, NULL);
+	else
+		res = hv_do_hypercall(HVCALL_RETARGET_INTERRUPT |
+				      (var_size << 17),
+				      params, NULL);
 
 exit_unlock:
 	spin_unlock_irqrestore(&hbus->retarget_msi_interrupt_lock, flags);
-- 
2.34.1