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Message-ID: <50cd5f55be8ead0937ac315cd2f5b89364f6a9a5.camel@infradead.org>
Subject: [PATCH] iommu/amd: Set iommu->int_enabled consistently when
 interrupts are set up
From:   David Woodhouse <dwmw2@infradead.org>
To:     Borislav Petkov <bp@alien8.de>, iommu@lists.linux-foundation.org
Cc:     Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        lkml <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Date:   Tue, 05 Jan 2021 01:32:51 +0000
In-Reply-To: <20210104232353.GJ32151@zn.tnic>
References: <20210104132250.GE32151@zn.tnic>
         <20210104232353.GJ32151@zn.tnic>
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From: David Woodhouse <dwmw@amazon.co.uk>

When I made the INTCAPXT support stop gratuitously pretending to be MSI,
I missed the fact that iommu_setup_msi() also sets the ->int_enabled
flag. I missed this in the iommu_setup_intcapxt() code path, which means
that a resume from suspend will try to allocate the IRQ domains again,
accidentally re-enabling interrupts as it does, resulting in much sadness.

Lift out the bit which sets iommu->int_enabled into the iommu_init_irq()
function which is also where it gets checked.

Link: https://lore.kernel.org/r/20210104132250.GE32151@zn.tnic/
Fixes: d1adcfbb520c ("iommu/amd: Fix IOMMU interrupt generation in X2APIC m=
ode")
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
There's a possibility we also need to ensure that the actual
MMIO_INTCAPXT_xxx_OFFSET registers are restored too. Unless you
actually trigger something to generate faults, you'll never know.
I don't see offhand how that was working in the pretend-to-be-MSI case
either.

 drivers/iommu/amd/init.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index f54cd79b43e4..6a1f7048dacc 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -1973,8 +1973,6 @@ static int iommu_setup_msi(struct amd_iommu *iommu)
 		return r;
 	}
=20
-	iommu->int_enabled =3D true;
-
 	return 0;
 }
=20
@@ -2169,6 +2167,7 @@ static int iommu_init_irq(struct amd_iommu *iommu)
 	if (ret)
 		return ret;
=20
+	iommu->int_enabled =3D true;
 enable_faults:
 	iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
=20
--=20
2.29.2


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