diff options
Diffstat (limited to 'arch/arm64/kvm/guest.c')
| -rw-r--r-- | arch/arm64/kvm/guest.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index dfb5218137ca..3f23f7478d2a 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -252,10 +252,32 @@ static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) memcpy(addr, valp, KVM_REG_SIZE(reg->id)); if (*vcpu_cpsr(vcpu) & PSR_MODE32_BIT) { - int i; + int i, nr_reg; - for (i = 0; i < 16; i++) - *vcpu_reg32(vcpu, i) = (u32)*vcpu_reg32(vcpu, i); + switch (*vcpu_cpsr(vcpu)) { + /* + * Either we are dealing with user mode, and only the + * first 15 registers (+ PC) must be narrowed to 32bit. + * AArch32 r0-r14 conveniently map to AArch64 x0-x14. + */ + case PSR_AA32_MODE_USR: + case PSR_AA32_MODE_SYS: + nr_reg = 15; + break; + + /* + * Otherwide, this is a priviledged mode, and *all* the + * registers must be narrowed to 32bit. + */ + default: + nr_reg = 31; + break; + } + + for (i = 0; i < nr_reg; i++) + vcpu_set_reg(vcpu, i, (u32)vcpu_get_reg(vcpu, i)); + + *vcpu_pc(vcpu) = (u32)*vcpu_pc(vcpu); } out: return err; |