From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Graf Date: Fri, 17 Jun 2011 14:49:41 +0000 Subject: [PATCH 04/15] powerpc/e500: Save SPEFCSR in flush_spe_to_thread() Message-Id: <1308322192-11918-5-git-send-email-agraf@suse.de> List-Id: References: <1308322192-11918-1-git-send-email-agraf@suse.de> In-Reply-To: <1308322192-11918-1-git-send-email-agraf@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: KVM list Cc: kvm-ppc@vger.kernel.org, yu liu , Scott Wood From: yu liu giveup_spe() saves the SPE state which is protected by MSR[SPE]. However, modifying SPEFSCR does not trap when MSR[SPE]=0. And since SPEFSCR is already saved/restored in _switch(), not all the callers want to save SPEFSCR again. Thus, saving SPEFSCR should not belong to giveup_spe(). This patch moves SPEFSCR saving to flush_spe_to_thread(), and cleans up the caller that needs to save SPEFSCR accordingly. Signed-off-by: Liu Yu Acked-by: Kumar Gala Signed-off-by: Scott Wood Signed-off-by: Alexander Graf --- arch/powerpc/kernel/head_fsl_booke.S | 2 -- arch/powerpc/kernel/process.c | 1 + arch/powerpc/kernel/traps.c | 5 +---- 3 files changed, 2 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S index 5ecf54c..aede4f8 100644 --- a/arch/powerpc/kernel/head_fsl_booke.S +++ b/arch/powerpc/kernel/head_fsl_booke.S @@ -792,8 +792,6 @@ _GLOBAL(giveup_spe) evmwumiaa evr6, evr6, evr6 /* evr6 <- ACC = 0 * 0 + ACC */ li r4,THREAD_ACC evstddx evr6, r4, r3 /* save off accumulator */ - mfspr r6,SPRN_SPEFSCR - stw r6,THREAD_SPEFSCR(r3) /* save spefscr register value */ beq 1f lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5) lis r3,MSR_SPE@h diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 91e52df..60ac2a9 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -213,6 +213,7 @@ void flush_spe_to_thread(struct task_struct *tsk) #ifdef CONFIG_SMP BUG_ON(tsk != current); #endif + tsk->thread.spefscr = mfspr(SPRN_SPEFSCR); giveup_spe(tsk); } preempt_enable(); diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 0ff4ab9..22d4ee5 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -1388,10 +1388,7 @@ void SPEFloatingPointException(struct pt_regs *regs) int code = 0; int err; - preempt_disable(); - if (regs->msr & MSR_SPE) - giveup_spe(current); - preempt_enable(); + flush_spe_to_thread(current); spefscr = current->thread.spefscr; fpexc_mode = current->thread.fpexc_mode; -- 1.6.0.2