[v2,4/5] KVM: PPC: Book3S HV: Implement LPCR[AIL]=3 mode for injected interrupts
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Message ID 20191002060025.11644-5-npiggin@gmail.com
State New
Headers show
Series
  • Fix LPCR[AIL]=3 implementation
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Commit Message

Nicholas Piggin Oct. 2, 2019, 6 a.m. UTC
kvmppc_inject_interrupt does not implement LPCR[AIL]!=0 modes, which
can result in the guest receiving interrupts as if LPCR[AIL]=0
contrary to the ISA.

In practice, Linux guests cope with this deviation, but it should be
fixed.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/kvm/book3s_hv_builtin.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

Patch
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diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
index 068bee941a71..7cd3cf3d366b 100644
--- a/arch/powerpc/kvm/book3s_hv_builtin.c
+++ b/arch/powerpc/kvm/book3s_hv_builtin.c
@@ -792,6 +792,21 @@  static void inject_interrupt(struct kvm_vcpu *vcpu, int vec, u64 srr1_flags)
 	else
 		new_msr |= msr & MSR_TS_MASK;
 
+	/*
+	 * Perform MSR and PC adjustment for LPCR[AIL]=3 if it is set and
+	 * applicable. AIL=2 is not supported.
+	 *
+	 * AIL does not apply to SRESET, MCE, or HMI (which is never
+	 * delivered to the guest), and does not apply if IR=0 or DR=0.
+	 */
+	if (vec != BOOK3S_INTERRUPT_SYSTEM_RESET &&
+	    vec != BOOK3S_INTERRUPT_MACHINE_CHECK &&
+	    (vcpu->arch.vcore->lpcr & LPCR_AIL) == LPCR_AIL_3 &&
+	    (msr & (MSR_IR|MSR_DR)) == (MSR_IR|MSR_DR) ) {
+		new_msr |= MSR_IR | MSR_DR;
+		new_pc += 0xC000000000004000ULL;
+	}
+
 	kvmppc_set_srr0(vcpu, pc);
 	kvmppc_set_srr1(vcpu, (msr & SRR1_MSR_BITS) | srr1_flags);
 	kvmppc_set_pc(vcpu, new_pc);