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authorScott Wood <scottwood@freescale.com>2011-11-08 18:23:30 -0600
committerAvi Kivity <avi@redhat.com>2012-03-05 14:52:26 +0200
commitb59049720dd95021dfe0d9f4e1fa9458a67cfe29 (patch)
tree3b54577e12ba4a84bec409518c6c8f399ebba6e0 /drivers/watchdog
parent940b45ec18cf00046b8b28299d97066a2c43d559 (diff)
downloadlinux-b59049720dd95021dfe0d9f4e1fa9458a67cfe29.tar.bz2
KVM: PPC: Paravirtualize SPRG4-7, ESR, PIR, MASn
This allows additional registers to be accessed by the guest in PR-mode KVM without trapping. SPRG4-7 are readable from userspace. On booke, KVM will sync these registers when it enters the guest, so that accesses from guest userspace will work. The guest kernel, OTOH, must consistently use either the real registers or the shared area between exits. This also applies to the already-paravirted SPRG3. On non-booke, it's not clear to what extent SPRG4-7 are supported (they're not architected for book3s, but exist on at least some classic chips). They are copied in the get/set regs ioctls, but I do not see any non-booke emulation. I also do not see any syncing with real registers (in PR-mode) including the user-readable SPRG3. This patch should not make that situation any worse. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
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