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[v6,04/48] KVM: PPC: Book3S HV: Prevent radix guests setting LPCR[TC]

Message ID 20210405011948.675354-5-npiggin@gmail.com
State New
Headers show
Series KVM: PPC: Book3S: C-ify the P9 entry/exit code | expand

Commit Message

Nicholas Piggin April 5, 2021, 1:19 a.m. UTC 
Prevent radix guests setting LPCR[TC]. This bit only applies to hash
partitions.

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

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;