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| author | Gautham R. Shenoy <ego@linux.vnet.ibm.com> | 2016-09-07 07:16:30 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-09-12 04:45:50 +0200 |
| commit | bd00a240dc52e28706fbbe3aceda63e6c291b433 (patch) | |
| tree | 0d231a972425c1c380739b652af0e96930a234be /arch/arm | |
| parent | powerpc/mm: Don't alias user region to other regions below PAGE_OFFSET (diff) | |
| download | linux-bd00a240dc52e28706fbbe3aceda63e6c291b433.tar.xz linux-bd00a240dc52e28706fbbe3aceda63e6c291b433.zip | |
powerpc/powernv: Fix restore of SPRs upon wake up from hypervisor state loss
pnv_wakeup_tb_loss() currently expects cr4 to be "eq" if the CPU is
waking up from a complete hypervisor state loss. Hence, it currently
restores the SPR contents only if cr4 is "eq".
However, after commit bcef83a00dc4 ("powerpc/powernv: Add platform
support for stop instruction"), on ISA v3.0 CPUs, the function
pnv_restore_hyp_resource() sets cr4 to contain the result of the
comparison between the state the CPU has woken up from and the first
deep stop state before calling pnv_wakeup_tb_loss().
Thus if the CPU woke up from a state that is deeper than the first
deep stop state, cr4 will have "gt" set and hence, pnv_wakeup_tb_loss()
will fail to restore the SPRs on waking up from such a state.
Fix the code in pnv_wakeup_tb_loss() to restore the SPR states when cr4
is "eq" or "gt".
Fixes: bcef83a00dc4 ("powerpc/powernv: Add platform support for stop instruction")
Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Reviewed-by: Shreyas B. Prabhu <shreyasbp@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/arm')
0 files changed, 0 insertions, 0 deletions