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powerpc: Fix oops due to bad access of lppaca on bare metal

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Commit 8e0b634b13 ("powerpc/64s: Do not allocate lppaca if we are
not virtualized") removed allocation of lppaca on bare metal
platforms. But with CONFIG_PPC_SPLPAR enabled, we still access the
lppaca on bare metal in some code paths.

Fix this but adding runtime checks for SPLPAR (shared processor LPAR).

Fixes: 8e0b634b13 ("powerpc/64s: Do not allocate lppaca if we are not virtualized")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V
2018-04-02 13:03:37 +05:30
committed by Michael Ellerman
parent 19e68b2aec
commit a6201da34f
3 changed files with 8 additions and 0 deletions
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3
arch/powerpc/include/asm/lppaca.h
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@@ -34,6 +34,7 @@
#include <linux/threads.h>
#include <asm/types.h>
#include <asm/mmu.h>
#include <asm/firmware.h>
/*
* The lppaca is the "virtual processor area" registered with the hypervisor,
@@ -114,6 +115,8 @@ struct lppaca {
static inline bool lppaca_shared_proc(struct lppaca *l)
{
if (!firmware_has_feature(FW_FEATURE_SPLPAR))
return false;
return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
}