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authorAlexander Graf <agraf@suse.de>2014-05-15 14:38:03 +0200
committerAlexander Graf <agraf@suse.de>2014-05-30 14:26:30 +0200
commitd8d164a9850d486cc48081c18831680254688d0f (patch)
tree6c8d77919d3f2c0ce26f448c148be55cbf2c0bfa /arch/powerpc/kernel/paca.c
parent207438d4e21e05728a8a58b5e25b0f6553260068 (diff)
downloadlinux-d8d164a9850d486cc48081c18831680254688d0f.tar.bz2
KVM: PPC: Book3S PR: Rework SLB switching code
On LPAR guest systems Linux enables the shadow SLB to indicate to the hypervisor a number of SLB entries that always have to be available. Today we go through this shadow SLB and disable all ESID's valid bits. However, pHyp doesn't like this approach very much and honors us with fancy machine checks. Fortunately the shadow SLB descriptor also has an entry that indicates the number of valid entries following. During the lifetime of a guest we can just swap that value to 0 and don't have to worry about the SLB restoration magic. While we're touching the code, let's also make it more readable (get rid of rldicl), allow it to deal with a dynamic number of bolted SLB entries and only do shadow SLB swizzling on LPAR systems. Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kernel/paca.c')
-rw-r--r--arch/powerpc/kernel/paca.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index ad302f845e5d..d6e195e8cd4c 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -98,6 +98,9 @@ static inline void free_lppacas(void) { }
/*
* 3 persistent SLBs are registered here. The buffer will be zero
* initially, hence will all be invaild until we actually write them.
+ *
+ * If you make the number of persistent SLB entries dynamic, please also
+ * update PR KVM to flush and restore them accordingly.
*/
static struct slb_shadow *slb_shadow;