[PATCH] KVM: PPC: e500: Emulate TMCFG0 TMRN register

[PATCH] KVM: PPC: e500: Emulate TMCFG0 TMRN register

[Laurentiu Tudor]

Emulate TMCFG0 TMRN register exposing one HW thread per vcpu.

Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com>
[Laurentiu.Tudor@freescale.com: rebased on latest kernel,
 use define instead of hardcoded value]
Signed-off-by: Laurentiu Tudor <Laurentiu.Tudor@freescale.com>
---
Needs this patch: https://patchwork.ozlabs.org/patch/521752/

 arch/powerpc/include/asm/disassemble.h |  5 +++++
 arch/powerpc/kvm/e500_emulate.c        | 11 +++++++++++
 2 files changed, 16 insertions(+)

diff --git a/arch/powerpc/include/asm/disassemble.h b/arch/powerpc/include/asm/disassemble.h
index 6330a61..4852e84 100644
--- a/arch/powerpc/include/asm/disassemble.h
+++ b/arch/powerpc/include/asm/disassemble.h
@@ -42,6 +42,11 @@ static inline unsigned int get_dcrn(u32 inst)
 	return ((inst >> 16) & 0x1f) | ((inst >> 6) & 0x3e0);
 }
 
+static inline unsigned int get_tmrn(u32 inst)
+{
+	return ((inst >> 16) & 0x1f) | ((inst >> 6) & 0x3e0);
+}
+
 static inline unsigned int get_rt(u32 inst)
 {
 	return (inst >> 21) & 0x1f;
diff --git a/arch/powerpc/kvm/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c
index ce7291c..44ac54b 100644
--- a/arch/powerpc/kvm/e500_emulate.c
+++ b/arch/powerpc/kvm/e500_emulate.c
@@ -15,6 +15,7 @@
 #include <asm/kvm_ppc.h>
 #include <asm/disassemble.h>
 #include <asm/dbell.h>
+#include <asm/reg_booke.h>
 
 #include "booke.h"
 #include "e500.h"
@@ -22,6 +23,7 @@
 #define XOP_DCBTLS  166
 #define XOP_MSGSND  206
 #define XOP_MSGCLR  238
+#define XOP_MFTMR   366
 #define XOP_TLBIVAX 786
 #define XOP_TLBSX   914
 #define XOP_TLBRE   946
@@ -165,6 +167,15 @@ int kvmppc_core_emulate_op_e500(struct kvm_run *run, struct kvm_vcpu *vcpu,
 			emulated = kvmppc_e500_emul_tlbivax(vcpu, ea);
 			break;
 
+		case XOP_MFTMR:
+			/* Expose one thread per vcpu */
+			if (get_tmrn(inst) = TMRN_TMCFG0)
+				kvmppc_set_gpr(vcpu, rt,
+					       1 | (1 << TMRN_TMCFG0_NATHRD_SHIFT));
+			else
+				emulated = EMULATE_FAIL;
+			break;
+
 		case XOP_EHPRIV:
 			emulated = kvmppc_e500_emul_ehpriv(run, vcpu, inst,
 							   advance);
-- 
1.8.3.1

Re: [PATCH] KVM: PPC: e500: Emulate TMCFG0 TMRN register

[Scott Wood]

On Thu, 2015-09-24 at 09:56 +0300, Laurentiu Tudor wrote:
> Emulate TMCFG0 TMRN register exposing one HW thread per vcpu.
> 
> Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com>
> [Laurentiu.Tudor@freescale.com: rebased on latest kernel,
>  use define instead of hardcoded value]
> Signed-off-by: Laurentiu Tudor <Laurentiu.Tudor@freescale.com>
> ---
> Needs this patch: https://patchwork.ozlabs.org/patch/521752/
> 
>  arch/powerpc/include/asm/disassemble.h |  5 +++++
>  arch/powerpc/kvm/e500_emulate.c        | 11 +++++++++++
>  2 files changed, 16 insertions(+)

KVM patches should be sent to kvm@vger.kernel.org in addition to kvm-
ppc@vger.kernel.org.

> @@ -165,6 +167,15 @@ int kvmppc_core_emulate_op_e500(struct kvm_run *run, 
> struct kvm_vcpu *vcpu,
>                       emulated = kvmppc_e500_emul_tlbivax(vcpu, ea);
>                       break;
>  
> +             case XOP_MFTMR:
> +                     /* Expose one thread per vcpu */
> +                     if (get_tmrn(inst) = TMRN_TMCFG0)
> +                             kvmppc_set_gpr(vcpu, rt,
> +                                            1 | (1 << TMRN_TMCFG0_NATHRD_SHIFT));
> +                     else
> +                             emulated = EMULATE_FAIL;
> +                     break;

Line length.  Please move the implementation into its own function like all 
the others.

-Scott