x86, hyperv: When on Hyper-v use NULL legacy PIC
Use the NULL legacy PIC when on Hyper-V. With this change we can support kexec
even when booting on EFI firmware. This patch has been tested on both EFI as
well as non-EFI firmware stacks on Hyper-V.
This patch is required to support kexec on EFI firmware on Hyper-V. Please
apply.
[ hpa: HyperV in EFI mode doesn't include a legacy PIC, and apparently
doesn't stub it out in a meaningful way. This becomes an issue
after kexec if the second kernel doesn't know it is EFI-booted.
Since HyperV presumably never actually *needs* the legacy PIC, we
can just disable it. ]
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Link: http://lkml.kernel.org/r/1396574193-12043-1-git-send-email-kys@microsoft.com
Cc: <stable@vger.kernel.org> [3.13+]
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
1 file changed
