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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@amd.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@suse.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@suse.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
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