diff mbox series

[RFC,v11,04/29] KVM: PPC: Drop dead code related to KVM_ARCH_WANT_MMU_NOTIFIER

Message ID 20230718234512.1690985-5-seanjc@google.com (mailing list archive)
State New
Headers show
Series KVM: guest_memfd() and per-page attributes | expand

Commit Message

Sean Christopherson July 18, 2023, 11:44 p.m. UTC 
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/powerpc/kvm/powerpc.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Comments

Paolo Bonzini July 19, 2023, 5:34 p.m. UTC | #1 
On 7/19/23 01:44, Sean Christopherson wrote:
> Signed-off-by: Sean Christopherson<seanjc@google.com>
> ---
>   arch/powerpc/kvm/powerpc.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 7197c8256668..5cf9e5e3112a 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -634,10 +634,11 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
>   	case KVM_CAP_SYNC_MMU:
>   #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
>   		r = hv_enabled;

This could actually be unnecessarily conservative.  Even book3s_pr.c 
knows how to do unmap and set_spte, so it should be able to support 
KVM_CAP_SYNC_MMU.  Alex, Nick, do you remember any of this?  This would 
mean moving KVM_CAP_SYNC_MMU to virt/kvm/kvm_main.c, which is nice.

Paolo

> -#elif defined(KVM_ARCH_WANT_MMU_NOTIFIER)
> -		r = 1;
>   #else
> -		r = 0;
> +#ifndef KVM_ARCH_WANT_MMU_NOTIFIER
> +		BUILD_BUG();
> +#endif
> +		r = 1;
>   #endif
>   		break;
>   #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
diff mbox series

Patch

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 7197c8256668..5cf9e5e3112a 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -634,10 +634,11 @@  int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_SYNC_MMU:
 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 		r = hv_enabled;
-#elif defined(KVM_ARCH_WANT_MMU_NOTIFIER)
-		r = 1;
 #else
-		r = 0;
+#ifndef KVM_ARCH_WANT_MMU_NOTIFIER
+		BUILD_BUG();
+#endif
+		r = 1;
 #endif
 		break;
 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE