From: Christoffer Dall <[email protected]> The VMPIDR_EL2 and VPIDR_EL2 are architecturally UNKNOWN at reset, but let's be nice to a guest hypervisor behaving foolishly and reset these to something reasonable anyway.
Reviewed-by: Russell King (Oracle) <[email protected]> Signed-off-by: Christoffer Dall <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> --- arch/arm64/kvm/sys_regs.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 06ca98458815..25386cb622c5 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -591,7 +591,7 @@ static void reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) vcpu_write_sys_reg(vcpu, actlr, ACTLR_EL1); } -static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +static u64 compute_reset_mpidr(struct kvm_vcpu *vcpu) { u64 mpidr; @@ -605,7 +605,24 @@ static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0); mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1); mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2); - vcpu_write_sys_reg(vcpu, (1ULL << 31) | mpidr, MPIDR_EL1); + mpidr |= (1ULL << 31); + + return mpidr; +} + +static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + vcpu_write_sys_reg(vcpu, compute_reset_mpidr(vcpu), MPIDR_EL1); +} + +static void reset_vmpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + vcpu_write_sys_reg(vcpu, compute_reset_mpidr(vcpu), VMPIDR_EL2); +} + +static void reset_vpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + vcpu_write_sys_reg(vcpu, read_cpuid_id(), VPIDR_EL2); } static unsigned int pmu_visibility(const struct kvm_vcpu *vcpu, @@ -1873,8 +1890,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { { PMU_SYS_REG(SYS_PMCCFILTR_EL0), .access = access_pmu_evtyper, .reset = reset_val, .reg = PMCCFILTR_EL0, .val = 0 }, - EL2_REG(VPIDR_EL2, access_rw, reset_val, 0), - EL2_REG(VMPIDR_EL2, access_rw, reset_val, 0), + EL2_REG(VPIDR_EL2, access_rw, reset_vpidr, 0), + EL2_REG(VMPIDR_EL2, access_rw, reset_vmpidr, 0), EL2_REG(SCTLR_EL2, access_rw, reset_val, SCTLR_EL2_RES1), EL2_REG(ACTLR_EL2, access_rw, reset_val, 0), EL2_REG(HCR_EL2, access_rw, reset_val, 0), -- 2.30.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
