From 89581f06b2bc225f0c9822fa52e714aa2e3810dd Mon Sep 17 00:00:00 2001 From: Andrew Jones Date: Fri, 22 Jul 2016 10:38:46 -0400 Subject: [PATCH] arm64: KVM: Set cpsr before spsr on fault injection We need to set cpsr before determining the spsr bank, as the bank depends on the target exception level of the injection, not the current mode of the vcpu. Normally this is one in the same (EL1), but not when we manage to trap an EL0 fault. It still doesn't really matter for the 64-bit EL0 case though, as vcpu_spsr() unconditionally uses the EL1 bank for that. However the 32-bit EL0 case gets fun, as that path will lead to the BUG() in vcpu_spsr32(). This patch fixes the assignment order and also modifies some white space in order to better group pairs of lines that have strict order. Cc: stable@vger.kernel.org # v4.5 Signed-off-by: Andrew Jones Signed-off-by: Marc Zyngier --- arch/arm64/kvm/inject_fault.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c index e9e0e6db73f6..898c0e6aedd4 100644 --- a/arch/arm64/kvm/inject_fault.c +++ b/arch/arm64/kvm/inject_fault.c @@ -132,16 +132,14 @@ static u64 get_except_vector(struct kvm_vcpu *vcpu, enum exception_type type) static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned long addr) { unsigned long cpsr = *vcpu_cpsr(vcpu); - bool is_aarch32; + bool is_aarch32 = vcpu_mode_is_32bit(vcpu); u32 esr = 0; - is_aarch32 = vcpu_mode_is_32bit(vcpu); - - *vcpu_spsr(vcpu) = cpsr; *vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu); - *vcpu_pc(vcpu) = get_except_vector(vcpu, except_type_sync); + *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64; + *vcpu_spsr(vcpu) = cpsr; vcpu_sys_reg(vcpu, FAR_EL1) = addr; @@ -172,11 +170,11 @@ static void inject_undef64(struct kvm_vcpu *vcpu) unsigned long cpsr = *vcpu_cpsr(vcpu); u32 esr = (ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT); - *vcpu_spsr(vcpu) = cpsr; *vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu); - *vcpu_pc(vcpu) = get_except_vector(vcpu, except_type_sync); + *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64; + *vcpu_spsr(vcpu) = cpsr; /* * Build an unknown exception, depending on the instruction