linux-kernel - [PATCH] iommu: Don't use sme

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Message-ID: <20190903132038.GE11530@8bytes.org>
Date:   Tue, 3 Sep 2019 15:20:38 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] iommu: Don't use sme_active() in generic code

On Tue, Sep 03, 2019 at 03:28:49PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> On Mon, 2 Sep 2019 14:26:40 +0000 "Lendacky, Thomas" <Thomas.Lendacky@....com> wrote:
> > Maybe we should make this mem_encrypt_active(), since this will probably
> > be needed if/when an IOMMU device is eventually added to a guest, and the
> > referenced commit below doesn't remove that call.
> 
> I have done that for today:

Thanks Stephen and Tom. I queued the attached patch into the iommu tree
to fix the problem.

>From 2896ba40d0becdb72b45f096cad70633abc014f6 Mon Sep 17 00:00:00 2001
From: Joerg Roedel <jroedel@...e.de>
Date: Tue, 3 Sep 2019 15:15:44 +0200
Subject: [PATCH] iommu: Don't use sme_active() in generic code

Switch to the generic function mem_encrypt_active() because
sme_active() is x86 specific and can't be called from
generic code on other platforms than x86.

Fixes: 2cc13bb4f59f ("iommu: Disable passthrough mode when SME is active")
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 66cfacaa483d..d658c7c6a2ab 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -120,8 +120,8 @@ static int __init iommu_subsys_init(void)
 		else
 			iommu_set_default_translated(false);
 
-		if (iommu_default_passthrough() && sme_active()) {
-			pr_info("SME detected - Disabling default IOMMU Passthrough\n");
+		if (iommu_default_passthrough() && mem_encrypt_active()) {
+			pr_info("Memory encryption detected - Disabling default IOMMU Passthrough\n");
 			iommu_set_default_translated(false);
 		}
 	}
-- 
2.16.4