Commit 72c15287 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

KVM: PPC: Book3S HV: Prevent radix guests setting LPCR[TC] 



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

Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Reviewed-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210412014845.1517916-6-npiggin@gmail.com
parent bcc92a0d

arch/powerpc/kvm/book3s_hv.c

+4 −0
Original line number Diff line number Diff line
@@ -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;