From: Marc Zyngier <marc.zyngier@arm.com>
Date: Wed, 7 May 2014 12:44:49 +0000 (+0100)
Subject: arm64: KVM: implement lazy world switch for debug registers
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~130^2~11^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b0e626b380872b663918230fafdac128c34fea56;p=pandora-kernel.git

arm64: KVM: implement lazy world switch for debug registers

Implement switching of the debug registers. While the number
of registers is massive, CPUs usually don't implement them all
(A57 has 6 breakpoints and 4 watchpoints, which gives us a total
of 22 registers "only").

Also, we only save/restore them when MDSCR_EL1 has debug enabled,
or when we've flagged the debug registers as dirty. It means that
most of the time, we only save/restore MDSCR_EL1.

Reviewed-by: Anup Patel <anup.patel@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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