Commit 3d3efb68 authored by Paul Mackerras's avatar Paul Mackerras

KVM: PPC: Book3S HV: Ignore timebase offset on POWER9 DD1

POWER9 DD1 has an erratum where writing to the TBU40 register, which
is used to apply an offset to the timebase, can cause the timebase to
lose counts.  This results in the timebase on some CPUs getting out of
sync with other CPUs, which then results in misbehaviour of the
timekeeping code.

To work around the problem, we make KVM ignore the timebase offset for
all guests on POWER9 DD1 machines.  This means that live migration
cannot be supported on POWER9 DD1 machines.

Cc: stable@vger.kernel.org # v4.10+
Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
parent 7ceaa6dc
...@@ -1486,6 +1486,14 @@ static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, ...@@ -1486,6 +1486,14 @@ static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len); r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
break; break;
case KVM_REG_PPC_TB_OFFSET: case KVM_REG_PPC_TB_OFFSET:
/*
* POWER9 DD1 has an erratum where writing TBU40 causes
* the timebase to lose ticks. So we don't let the
* timebase offset be changed on P9 DD1. (It is
* initialized to zero.)
*/
if (cpu_has_feature(CPU_FTR_POWER9_DD1))
break;
/* round up to multiple of 2^24 */ /* round up to multiple of 2^24 */
vcpu->arch.vcore->tb_offset = vcpu->arch.vcore->tb_offset =
ALIGN(set_reg_val(id, *val), 1UL << 24); ALIGN(set_reg_val(id, *val), 1UL << 24);
......
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