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

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

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210412014845.1517916-6-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-04-12 11:48:38 +10:00 committed by Michael Ellerman
parent bcc92a0d6d
commit 72c1528721
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/kvm/book3s_hv.c
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@ -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;