[PATCH v1 05/12] KVM: PPC: Book3S HV: Prevent radix guests setting LPCR[TC]

[Nicholas Piggin]

Prevent radix guests setting LPCR[TC]. This bit only applies to hash
partitions.

Reviewed-by: Alexey Kardashevskiy <a...@ozlabs.ru>
Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
 arch/powerpc/kvm/book3s_hv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 3de8a1f89a7d..70c6e9c27eb7 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1645,6 +1645,10 @@ static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct 
kvm_vcpu *vcpu,
  */
 unsigned long kvmppc_filter_lpcr_hv(struct kvm *kvm, unsigned long lpcr)
 {
+       /* LPCR_TC only applies to HPT guests */
+       if (kvm_is_radix(kvm))
+               lpcr &= ~LPCR_TC;
+
        /* On POWER8 and above, userspace can modify AIL */
        if (!cpu_has_feature(CPU_FTR_ARCH_207S))
                lpcr &= ~LPCR_AIL;
-- 
2.23.0