[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] xen/arm: disable interrupts on return_to_hypervisor
At the moment it is possible to reach return_to_hypervisor with interrupts enabled (it happens all the times when we are actually going back to hypervisor mode, when we don't take the return_to_guest path). If that happens we risk loosing the content of ELR_hyp: if we receive an interrupt right after restoring ELR_hyp, once we come back we'll have a different value in ELR_hyp and the original is lost. In order to make the return_to_hypervisor path safe, we disable interrupts before restoring any registers. Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> --- xen/arch/arm/entry.S | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/xen/arch/arm/entry.S b/xen/arch/arm/entry.S index 2ff32a1..1d6ff32 100644 --- a/xen/arch/arm/entry.S +++ b/xen/arch/arm/entry.S @@ -108,6 +108,7 @@ ENTRY(return_to_guest) RESTORE_ONE_BANKED(R11_fiq); RESTORE_ONE_BANKED(R12_fiq); /* Fall thru */ ENTRY(return_to_hypervisor) + cpsid i ldr lr, [sp, #UREGS_lr] ldr r11, [sp, #UREGS_pc] msr ELR_hyp, r11 -- 1.7.2.5 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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