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authorNicholas Piggin <npiggin@gmail.com>2019-10-02 16:00:25 +1000
committerPaul Mackerras <paulus@ozlabs.org>2019-10-22 16:29:02 +1100
commit55d7004299eb917767761f01a208d50afad4f535 (patch)
tree8f8abe1646e758012d8f11a094b86a6020e6707e /arch/powerpc/kvm/book3s_hv.c
parent6a13cb0c376abb436d060b989018257963656d0c (diff)
KVM: PPC: Book3S HV: Reject mflags=2 (LPCR[AIL]=2) ADDR_TRANS_MODE mode
AIL=2 mode has no known users, so is not well tested or supported. Disallow guests from selecting this mode because it may become deprecated in future versions of the architecture. This policy decision is not left to QEMU because KVM support is required for AIL=2 (when injecting interrupts). Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv.c')
-rw-r--r--arch/powerpc/kvm/book3s_hv.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index c340d416dce3..ec5c0379296a 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -779,6 +779,11 @@ static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
vcpu->arch.dawr = value1;
vcpu->arch.dawrx = value2;
return H_SUCCESS;
+ case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE:
+ /* KVM does not support mflags=2 (AIL=2) */
+ if (mflags != 0 && mflags != 3)
+ return H_UNSUPPORTED_FLAG_START;
+ return H_TOO_HARD;
default:
return H_TOO_HARD;
}