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@xxxxxxxxxxxx>
Should include a Fixes: and a Cc to stable ?
Fixes: 8792468da5e1 ("powerpc: Add the ability to save FPU without
giving it up")
Cc: stable@xxxxxxxxxxxxxxx
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;
