Re: [PATCH v4 4/4] KVM: s390: pv: Allow AP-instructions for pv-guests

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On 15.08.23 17:14, Steffen Eiden wrote:
Introduces new feature bits and enablement flags for AP and AP IRQ
support.

Signed-off-by: Steffen Eiden <seiden@xxxxxxxxxxxxx>
Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>

Reviewed-by: Michael Mueller <mimu@xxxxxxxxxxxxx>

---
  arch/s390/include/asm/uv.h | 12 +++++++++++-
  arch/s390/kvm/pv.c         |  6 ++++--
  2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
index 823adfff7315..0e7bd3873907 100644
--- a/arch/s390/include/asm/uv.h
+++ b/arch/s390/include/asm/uv.h
@@ -99,6 +99,8 @@ enum uv_cmds_inst {
  enum uv_feat_ind {
  	BIT_UV_FEAT_MISC = 0,
  	BIT_UV_FEAT_AIV = 1,
+	BIT_UV_FEAT_AP = 4,
+	BIT_UV_FEAT_AP_INTR = 5,
  };
struct uv_cb_header {
@@ -159,7 +161,15 @@ struct uv_cb_cgc {
  	u64 guest_handle;
  	u64 conf_base_stor_origin;
  	u64 conf_virt_stor_origin;
-	u64 reserved30;
+	u8  reserved30[6];
+	union {
+		struct {
+			u16 : 14;
+			u16 ap_instr_intr : 1;
+			u16 ap_allow_instr : 1;
+		};
+		u16 raw;
+	} flags;
  	u64 guest_stor_origin;
  	u64 guest_stor_len;
  	u64 guest_sca;
diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
index 8570ee324607..75e81ba26d04 100644
--- a/arch/s390/kvm/pv.c
+++ b/arch/s390/kvm/pv.c
@@ -576,12 +576,14 @@ int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
  	uvcb.conf_base_stor_origin =
  		virt_to_phys((void *)kvm->arch.pv.stor_base);
  	uvcb.conf_virt_stor_origin = (u64)kvm->arch.pv.stor_var;
+	uvcb.flags.ap_allow_instr = kvm->arch.model.uv_feat_guest.ap;
+	uvcb.flags.ap_instr_intr = kvm->arch.model.uv_feat_guest.ap_intr;
cc = uv_call_sched(0, (u64)&uvcb);
  	*rc = uvcb.header.rc;
  	*rrc = uvcb.header.rrc;
-	KVM_UV_EVENT(kvm, 3, "PROTVIRT CREATE VM: handle %llx len %llx rc %x rrc %x",
-		     uvcb.guest_handle, uvcb.guest_stor_len, *rc, *rrc);
+	KVM_UV_EVENT(kvm, 3, "PROTVIRT CREATE VM: handle %llx len %llx rc %x rrc %x flags %04x",
+		     uvcb.guest_handle, uvcb.guest_stor_len, *rc, *rrc, uvcb.flags.raw);
/* Outputs */
  	kvm->arch.pv.handle = uvcb.guest_handle;



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