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    Subject[PATCH 3/4] Revert "x86: disable IOMMUs on kernel crash"
    This effectively reverts commit 61d047be99757fd9b0af900d7abce9a13a337488.

    Disabling the IOMMU can potetially allow DMA transactions to
    complete without being translated. Leave it enabled, and allow
    crash kernel to do the IOMMU reinitialization properly.

    Cc: Joerg Roedel <joerg.roedel@amd.com>
    Cc: Eric Biederman <ebiederm@xmission.com>
    Cc: Neil Horman <nhorman@tuxdriver.com>
    Cc: Vivek Goyal <vgoyal@redhat.com>
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    ---
    arch/x86/kernel/crash.c | 6 ------
    1 file changed, 6 deletions(-)

    --- a/arch/x86/kernel/crash.c
    +++ b/arch/x86/kernel/crash.c
    @@ -27,7 +27,6 @@
    #include <asm/cpu.h>
    #include <asm/reboot.h>
    #include <asm/virtext.h>
    -#include <asm/x86_init.h>

    #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)

    @@ -103,10 +102,5 @@ void native_machine_crash_shutdown(struc
    #ifdef CONFIG_HPET_TIMER
    hpet_disable();
    #endif
    -
    -#ifdef CONFIG_X86_64
    - x86_platform.iommu_shutdown();
    -#endif
    -
    crash_save_cpu(regs, safe_smp_processor_id());
    }


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