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Date: Fri, 8 Feb 2019 15:45:24 +0100 From: Christophe Leroy <christophe.leroy@....fr> To: Mark Cave-Ayland <mark.cave-ayland@...nde.co.uk>, benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au, npiggin@...il.com, linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org Subject: Re: [PATCH] powerpc: fix 32-bit KVM-PR lockup and panic with MacOS guest Le 08/02/2019 à 15:33, Mark Cave-Ayland a écrit : > Commit 8792468da5e1 "powerpc: Add the ability to save FPU without giving it up" Expected format for the above is: Commit 123456789abc ("text") > unexpectedly removed the MSR_FE0 and MSR_FE1 bits from the bitmask used to > update the MSR of the previous thread in __giveup_fpu() causing a KVM-PR MacOS > guest to lockup and panic the kernel. > > Reinstate these bits to the MSR bitmask to enable MacOS guests to run under > 32-bit KVM-PR once again without issue. > > Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@...nde.co.uk> Should include a Fixes: and a Cc to stable ? Fixes: 8792468da5e1 ("powerpc: Add the ability to save FPU without giving it up") Cc: stable@...r.kernel.org Christophe > --- > arch/powerpc/kernel/process.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c > index ce393df243aa..71bad4b6f80d 100644 > --- a/arch/powerpc/kernel/process.c > +++ b/arch/powerpc/kernel/process.c > @@ -176,7 +176,7 @@ static void __giveup_fpu(struct task_struct *tsk) > > save_fpu(tsk); > msr = tsk->thread.regs->msr; > - msr &= ~MSR_FP; > + msr &= ~(MSR_FP|MSR_FE0|MSR_FE1); > #ifdef CONFIG_VSX > if (cpu_has_feature(CPU_FTR_VSX)) > msr &= ~MSR_VSX; >
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