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[3/3] KVM: s390: pv: Allow AP-instructions for pv guests

Message ID 20230727122053.774473-4-seiden@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series KVM: s390: Enable AP instructions for pv-guests | expand

Commit Message

Steffen Eiden July 27, 2023, 12:20 p.m. UTC 
Introduces new feature bits and enablement flags for AP and AP IRQ
support.

Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
---
 arch/s390/include/asm/uv.h | 12 +++++++++++-
 arch/s390/kvm/pv.c         |  8 ++++++--
 2 files changed, 17 insertions(+), 3 deletions(-)

Comments

Claudio Imbrenda July 27, 2023, 3:07 p.m. UTC | #1 
On Thu, 27 Jul 2023 14:20:53 +0200
Steffen Eiden <seiden@linux.ibm.com> wrote:

> Introduces new feature bits and enablement flags for AP and AP IRQ
> support.
> 
> Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
> ---
>  arch/s390/include/asm/uv.h | 12 +++++++++++-
>  arch/s390/kvm/pv.c         |  8 ++++++--
>  2 files changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
> index 338845402324..913ccfaa9d76 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 reserved : 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 899f3b8ac011..103add1894c9 100644
> --- a/arch/s390/kvm/pv.c
> +++ b/arch/s390/kvm/pv.c
> @@ -561,12 +561,16 @@ 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 = uv_has_feature(BIT_UV_FEAT_AP) &&
> +				    kvm->arch.model.uv_feat_guest.ap;

how can it happen that uv_feat_guest.ap is set but
uv_has_feature(BIT_UV_FEAT_AP) is 0 ?

in the previous patch you check for the feature before allowing the bit
to be set.

> +	uvcb.flags.ap_instr_intr = uv_has_feature(BIT_UV_FEAT_AP_INTR) &&
> +				   kvm->arch.model.uv_feat_guest.ap_intr;

same here

>  
>  	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;
diff mbox series

Patch

diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
index 338845402324..913ccfaa9d76 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 reserved : 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 899f3b8ac011..103add1894c9 100644
--- a/arch/s390/kvm/pv.c
+++ b/arch/s390/kvm/pv.c
@@ -561,12 +561,16 @@  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 = uv_has_feature(BIT_UV_FEAT_AP) &&
+				    kvm->arch.model.uv_feat_guest.ap;
+	uvcb.flags.ap_instr_intr = uv_has_feature(BIT_UV_FEAT_AP_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;