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![Shuah Khan](https://secure.gravatar.com/avatar/a98bbdc07fd60d7b2db51945db339932.jpg?s=96&d=mm)
Shuah Khan committed 16aab32ff8b
iommu/amd: Fix IOMMU perf counter clobbering during init commit 8c17bbf6c8f70058a66305f2e1982552e6ea7f47 upstream. init_iommu_perf_ctr() clobbers the register when it checks write access to IOMMU perf counters and fails to restore when they are writable. Add save and restore to fix it. Signed-off-by: Shuah Khan <skhan@linuxfoundation.org> Fixes: 30861ddc9cca4 ("perf/x86/amd: Add IOMMU Performance Counter resource management") Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Tested-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>