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powerpc: In HV mode, use HSPRG0 for PACA
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>
Thu, 20 Jan 2011 06:50:21 +0000 (17:50 +1100)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Wed, 20 Apr 2011 01:03:22 +0000 (11:03 +1000)
When running in Hypervisor mode (arch 2.06 or later), we store the PACA
in HSPRG0 instead of SPRG1. The architecture specifies that SPRGs may be
lost during a "nap" power management operation (though they aren't
currently on POWER7) and this enables use of SPRG1 by KVM guests.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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