KVM: PPC: Book3S HV: Add H_SET_MODE hcall handling
This adds support for the H_SET_MODE hcall. This hcall is a
multiplexer that has several functions, some of which are called
rarely, and some which are potentially called very frequently.
Here we add support for the functions that set the debug registers
CIABR (Completed Instruction Address Breakpoint Register) and
DAWR/DAWRX (Data Address Watchpoint Register and eXtension),
since they could be updated by the guest as often as every context
switch.
This also adds a kvmppc_power8_compatible() function to test to see
if a guest is compatible with POWER8 or not. The CIABR and DAWR/X
only exist on POWER8.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index c4377c7..7db9df2 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -557,6 +557,48 @@
vcpu->arch.dtl.dirty = true;
}
+static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu)
+{
+ if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207)
+ return true;
+ if ((!vcpu->arch.vcore->arch_compat) &&
+ cpu_has_feature(CPU_FTR_ARCH_207S))
+ return true;
+ return false;
+}
+
+static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
+ unsigned long resource, unsigned long value1,
+ unsigned long value2)
+{
+ switch (resource) {
+ case H_SET_MODE_RESOURCE_SET_CIABR:
+ if (!kvmppc_power8_compatible(vcpu))
+ return H_P2;
+ if (value2)
+ return H_P4;
+ if (mflags)
+ return H_UNSUPPORTED_FLAG_START;
+ /* Guests can't breakpoint the hypervisor */
+ if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER)
+ return H_P3;
+ vcpu->arch.ciabr = value1;
+ return H_SUCCESS;
+ case H_SET_MODE_RESOURCE_SET_DAWR:
+ if (!kvmppc_power8_compatible(vcpu))
+ return H_P2;
+ if (mflags)
+ return H_UNSUPPORTED_FLAG_START;
+ if (value2 & DABRX_HYP)
+ return H_P4;
+ vcpu->arch.dawr = value1;
+ vcpu->arch.dawrx = value2;
+ return H_SUCCESS;
+ default:
+ return H_TOO_HARD;
+ }
+}
+
int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
{
unsigned long req = kvmppc_get_gpr(vcpu, 3);
@@ -626,7 +668,14 @@
/* Send the error out to userspace via KVM_RUN */
return rc;
-
+ case H_SET_MODE:
+ ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4),
+ kvmppc_get_gpr(vcpu, 5),
+ kvmppc_get_gpr(vcpu, 6),
+ kvmppc_get_gpr(vcpu, 7));
+ if (ret == H_TOO_HARD)
+ return RESUME_HOST;
+ break;
case H_XIRR:
case H_CPPR:
case H_EOI:
@@ -652,6 +701,7 @@
case H_PROD:
case H_CONFER:
case H_REGISTER_VPA:
+ case H_SET_MODE:
#ifdef CONFIG_KVM_XICS
case H_XIRR:
case H_CPPR: