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[2/2] target/ppc/cpu_init: Synchronize HASHKEYR with KVM for migration

Message ID 171741557432.11675.11683958406314165970.stgit@c0c876608f2d (mailing list archive)
State New, archived
Headers show
Series ppc: spapr: Nested kvm guest migration fixes | expand

Commit Message

Shivaprasad G Bhat June 3, 2024, 11:53 a.m. UTC
The patch enables HASHKEYR migration by hooking with the
"KVM one reg" ID KVM_REG_PPC_HASHKEYR.

Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
---
 linux-headers/asm-powerpc/kvm.h |    1 +
 target/ppc/cpu_init.c           |    4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

Comments

Nicholas Piggin June 4, 2024, 5:58 a.m. UTC | #1
On Mon Jun 3, 2024 at 9:53 PM AEST, Shivaprasad G Bhat wrote:
> The patch enables HASHKEYR migration by hooking with the
> "KVM one reg" ID KVM_REG_PPC_HASHKEYR.
>
> Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
> ---
>  linux-headers/asm-powerpc/kvm.h |    1 +
>  target/ppc/cpu_init.c           |    4 ++--
>  2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/linux-headers/asm-powerpc/kvm.h b/linux-headers/asm-powerpc/kvm.h
> index fcb947f656..23a0af739c 100644
> --- a/linux-headers/asm-powerpc/kvm.h
> +++ b/linux-headers/asm-powerpc/kvm.h
> @@ -646,6 +646,7 @@ struct kvm_ppc_cpu_char {
>  #define KVM_REG_PPC_DAWR1	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc4)
>  #define KVM_REG_PPC_DAWRX1	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc5)
>  #define KVM_REG_PPC_DEXCR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc6)
> +#define KVM_REG_PPC_HASHKEYR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc7)
>  
>  /* Transactional Memory checkpointed state:
>   * This is all GPRs, all VSX regs and a subset of SPRs
> diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
> index b1422c2eab..cee0a609eb 100644
> --- a/target/ppc/cpu_init.c
> +++ b/target/ppc/cpu_init.c
> @@ -5805,10 +5805,10 @@ static void register_power10_hash_sprs(CPUPPCState *env)
>          ((uint64_t)g_rand_int(rand) << 32) | (uint64_t)g_rand_int(rand);
>      g_rand_free(rand);
>  #endif
> -    spr_register(env, SPR_HASHKEYR, "HASHKEYR",
> +    spr_register_kvm(env, SPR_HASHKEYR, "HASHKEYR",
>              SPR_NOACCESS, SPR_NOACCESS,
>              &spr_read_generic, &spr_write_generic,
> -            hashkeyr_initial_value);
> +            KVM_REG_PPC_HASHKEYR, hashkeyr_initial_value);
>      spr_register_hv(env, SPR_HASHPKEYR, "HASHPKEYR",
>              SPR_NOACCESS, SPR_NOACCESS,
>              SPR_NOACCESS, SPR_NOACCESS,

Hmm... now that I look at it, the hashpkey value also needs to be set
in the machine and migrated, right? That looks broken. I *think* if we
make this spr_register_kvm_hv, and you will also need to add a KVM
API for the register, that should get it working becuse SPRs will
be migrated for us.

Thanks,
Nick
diff mbox series

Patch

diff --git a/linux-headers/asm-powerpc/kvm.h b/linux-headers/asm-powerpc/kvm.h
index fcb947f656..23a0af739c 100644
--- a/linux-headers/asm-powerpc/kvm.h
+++ b/linux-headers/asm-powerpc/kvm.h
@@ -646,6 +646,7 @@  struct kvm_ppc_cpu_char {
 #define KVM_REG_PPC_DAWR1	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc4)
 #define KVM_REG_PPC_DAWRX1	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc5)
 #define KVM_REG_PPC_DEXCR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc6)
+#define KVM_REG_PPC_HASHKEYR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc7)
 
 /* Transactional Memory checkpointed state:
  * This is all GPRs, all VSX regs and a subset of SPRs
diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
index b1422c2eab..cee0a609eb 100644
--- a/target/ppc/cpu_init.c
+++ b/target/ppc/cpu_init.c
@@ -5805,10 +5805,10 @@  static void register_power10_hash_sprs(CPUPPCState *env)
         ((uint64_t)g_rand_int(rand) << 32) | (uint64_t)g_rand_int(rand);
     g_rand_free(rand);
 #endif
-    spr_register(env, SPR_HASHKEYR, "HASHKEYR",
+    spr_register_kvm(env, SPR_HASHKEYR, "HASHKEYR",
             SPR_NOACCESS, SPR_NOACCESS,
             &spr_read_generic, &spr_write_generic,
-            hashkeyr_initial_value);
+            KVM_REG_PPC_HASHKEYR, hashkeyr_initial_value);
     spr_register_hv(env, SPR_HASHPKEYR, "HASHPKEYR",
             SPR_NOACCESS, SPR_NOACCESS,
             SPR_NOACCESS, SPR_NOACCESS,