[PATCH v5 04/48] KVM: PPC: Book3S HV: Prevent radix guests setting LPCR[TC]
From: Nicholas Piggin <npiggin@gmail.com>
Date: 2021-04-01 15:05:57
Subsystem:
kernel virtual machine for powerpc (kvm/powerpc), linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
Prevent radix guests setting LPCR[TC]. This bit only applies to hash partitions. Reviewed-by: Alexey Kardashevskiy <redacted> Signed-off-by: Nicholas Piggin <npiggin@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 daded8949a39..a6b5d79d9306 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