[PATCH 0/2] iommu/hyperv: Fix guest IOMMU build issues

[PATCH 0/2] iommu/hyperv: Fix guest IOMMU build issues

[Yu Zhang]

This series address two issues reported by kernel test robot in the
recently applied Hyper-V guest IOMMU driver.
                                                                                                                                                        
The first one adds the missing PCI dependency to prevent a link failure
when CONFIG_PCI is disabled. And the second makes hv_iommu_device static
to address a sparse warning.

The patches are based on the hyper-v branch of the IOMMU tree.

Yu Zhang (2):
  iommu/hyperv: Add missing PCI dependency for the guest IOMMU driver
  iommu/hyperv: Make hv_iommu_device static

 drivers/iommu/hyperv/Kconfig          | 2 +-
 drivers/iommu/hyperv/hv-iommu-guest.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

-- 
2.52.0

[PATCH 1/2] iommu/hyperv: Add missing PCI dependency for the guest IOMMU driver

[Yu Zhang]

Make HYPERV_PVIOMMU depend on PCI, to fix the possible link failure
of pci_request_acs(), if HYPERV_PVIOMMU is enabled yet with PCI disabled. 
Such configuration shall be prevented.

Fixes: 2690d4156b51 ("iommu/hyperv: Add para-virtualized IOMMU support for Hyper-V guest")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202610110511.Nk1sZ8SG-lkp@intel.com/
Signed-off-by: Yu Zhang <zhangyu1@linux.microsoft.com>
---
 drivers/iommu/hyperv/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/hyperv/Kconfig b/drivers/iommu/hyperv/Kconfig
index fe24ed65b6a7..f2f993f647c3 100644
--- a/drivers/iommu/hyperv/Kconfig
+++ b/drivers/iommu/hyperv/Kconfig
@@ -2,7 +2,7 @@
 # Hyper-V para-virtualized IOMMU driver for Linux guests
 config HYPERV_PVIOMMU
 	bool "Microsoft Hyper-V para-virtualized IOMMU driver for Linux guests"
-	depends on X86_64 && HYPERV
+	depends on X86_64 && HYPERV && PCI
 	select IOMMU_DMA
 	select GENERIC_PT
 	select IOMMU_PT
-- 
2.52.0

[PATCH 2/2] iommu/hyperv: Make hv_iommu_device static

[Yu Zhang]

Make hv_iommu_device static to give it internal linkage. This
pointer is only used within hv-iommu-guest.c, but previously
has external linkage without a prior declaration. This causes
sparse to warn that the symbol was not declared.

Fixes: 2690d4156b51 ("iommu/hyperv: Add para-virtualized IOMMU support for Hyper-V guest")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202610092126.TuSXnTYR-lkp@intel.com/
Signed-off-by: Yu Zhang <zhangyu1@linux.microsoft.com>
---
 drivers/iommu/hyperv/hv-iommu-guest.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/hyperv/hv-iommu-guest.c b/drivers/iommu/hyperv/hv-iommu-guest.c
index fe06bd970621..876a22f21f1e 100644
--- a/drivers/iommu/hyperv/hv-iommu-guest.c
+++ b/drivers/iommu/hyperv/hv-iommu-guest.c
@@ -22,7 +22,7 @@
 #include "iommu.h"
 #include "../iommu-pages.h"
 
-struct hv_iommu_dev *hv_iommu_device;
+static struct hv_iommu_dev *hv_iommu_device;
 
 /*
  * Identity and blocking domains are static singletons: identity is a 1:1
-- 
2.52.0

Re: [PATCH 0/2] iommu/hyperv: Fix guest IOMMU build issues

[Jason Gunthorpe]

On Thu, 15 Oct 2026 16:23:49 +0800, Yu Zhang <zhangyu1@linux.microsoft.com> wrote:
> iommu/hyperv: Fix guest IOMMU build issues
> 
> This series address two issues reported by kernel test robot in the
> recently applied Hyper-V guest IOMMU driver.
> 
> The first one adds the missing PCI dependency to prevent a link failure
> when CONFIG_PCI is disabled. And the second makes hv_iommu_device static
> to address a sparse warning.
> 
> [...]

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

-- 
Jason

Re: [PATCH 0/2] iommu/hyperv: Fix guest IOMMU build issues

[Jacob Pan]

Hi Yu,

On Thu, 15 Oct 2026 16:23:49 +0800
Yu Zhang <zhangyu1@linux.microsoft.com> wrote:

> This series address two issues reported by kernel test robot in the
> recently applied Hyper-V guest IOMMU driver.
>                                                                                                                                                         
> The first one adds the missing PCI dependency to prevent a link
> failure when CONFIG_PCI is disabled. And the second makes
> hv_iommu_device static to address a sparse warning.
> 
> The patches are based on the hyper-v branch of the IOMMU tree.
> 
> Yu Zhang (2):
>   iommu/hyperv: Add missing PCI dependency for the guest IOMMU driver
>   iommu/hyperv: Make hv_iommu_device static
> 
>  drivers/iommu/hyperv/Kconfig          | 2 +-
>  drivers/iommu/hyperv/hv-iommu-guest.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 

Reviewed-by: Jacob Pan <jacob.pan@linux.microsoft.com>

Re: [PATCH 0/2] iommu/hyperv: Fix guest IOMMU build issues

[Jörg Rödel]

On Thu, Oct 15, 2026 at 04:23:49PM +0800, Yu Zhang wrote:
> Yu Zhang (2):
>   iommu/hyperv: Add missing PCI dependency for the guest IOMMU driver
>   iommu/hyperv: Make hv_iommu_device static

Applied, thanks.