From: Julien Grall Date: Mon, 14 Apr 2014 20:46:43 +0100 Subject: xen/arm: Upgrade DCISW into DCCISW A guest is allowed to use invalidate cache by set/way instruction (i.e DCISW) without any restriction. As the cache is shared with Xen, the guest invalidate an address being in used by Xen. This may lead a Xen crash because the memory state is invalid. Set the bit HCR.SWIO to upgrade invalidate cache by set/way instruction to an invalidate and clean. Signed-off-by: Julien Grall Reported-by: Thomas Leonard Acked-by: Ian Campbell --- xen/arch/arm/traps.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c index 97ab286..17ac8d8 100644 --- a/xen/arch/arm/traps.c +++ b/xen/arch/arm/traps.c @@ -82,7 +82,7 @@ void __cpuinit init_traps(void) /* Setup hypervisor traps */ WRITE_SYSREG(HCR_PTW|HCR_BSU_INNER|HCR_AMO|HCR_IMO|HCR_VM|HCR_TWI|HCR_TSC| - HCR_TAC, HCR_EL2); + HCR_TAC|HCR_SWIO, HCR_EL2); isb(); } -- 1.7.10.4