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| author | Scott Wood <scottwood@freescale.com> | 2014-03-10 17:29:38 -0500 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-03-19 19:57:14 -0500 |
| commit | 9d378dfac885f72b8b369d08fc61bef36e2f2dd1 (patch) | |
| tree | 8790aa68cd0944e031b35eb63f5be14ec678be2d /arch/powerpc/kvm/book3s_interrupts.S | |
| parent | 82d86de25b9c99db546e17c6f7ebf9a691da557e (diff) | |
| download | linux-9d378dfac885f72b8b369d08fc61bef36e2f2dd1.tar.bz2 | |
powerpc/booke64: Use SPRG7 for VDSO
Previously SPRG3 was marked for use by both VDSO and critical
interrupts (though critical interrupts were not fully implemented).
In commit 8b64a9dfb091f1eca8b7e58da82f1e7d1d5fe0ad ("powerpc/booke64:
Use SPRG0/3 scratch for bolted TLB miss & crit int"), Mihai Caraman
made an attempt to resolve this conflict by restoring the VDSO value
early in the critical interrupt, but this has some issues:
- It's incompatible with EXCEPTION_COMMON which restores r13 from the
by-then-overwritten scratch (this cost me some debugging time).
- It forces critical exceptions to be a special case handled
differently from even machine check and debug level exceptions.
- It didn't occur to me that it was possible to make this work at all
(by doing a final "ld r13, PACA_EXCRIT+EX_R13(r13)") until after
I made (most of) this patch. :-)
It might be worth investigating using a load rather than SPRG on return
from all exceptions (except TLB misses where the scratch never leaves
the SPRG) -- it could save a few cycles. Until then, let's stick with
SPRG for all exceptions.
Since we cannot use SPRG4-7 for scratch without corrupting the state of
a KVM guest, move VDSO to SPRG7 on book3e. Since neither SPRG4-7 nor
critical interrupts exist on book3s, SPRG3 is still used for VDSO
there.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Cc: Mihai Caraman <mihai.caraman@freescale.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: kvm-ppc@vger.kernel.org
Diffstat (limited to 'arch/powerpc/kvm/book3s_interrupts.S')
| -rw-r--r-- | arch/powerpc/kvm/book3s_interrupts.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kvm/book3s_interrupts.S b/arch/powerpc/kvm/book3s_interrupts.S index f779450cb07c..3533c999194a 100644 --- a/arch/powerpc/kvm/book3s_interrupts.S +++ b/arch/powerpc/kvm/book3s_interrupts.S @@ -153,8 +153,8 @@ kvm_start_lightweight: * Reload kernel SPRG3 value. * No need to save guest value as usermode can't modify SPRG3. */ - ld r3, PACA_SPRG3(r13) - mtspr SPRN_SPRG3, r3 + ld r3, PACA_SPRG_VDSO(r13) + mtspr SPRN_SPRG_VDSO_WRITE, r3 #endif /* CONFIG_PPC_BOOK3S_64 */ /* R7 = vcpu */ |