linux-kernel - [RFC PATCH 1/5] KVM: powerpc: remove remaining traces of KVM_CAP_PPC

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Message-ID: <20241023124507.280382-2-pbonzini@redhat.com>
Date: Wed, 23 Oct 2024 14:45:03 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Cc: roy.hopkins@...e.com,
	seanjc@...gle.com,
	michael.roth@....com,
	ashish.kalra@....com,
	jroedel@...e.de,
	thomas.lendacky@....com,
	nsaenz@...zon.com,
	anelkz@...zon.de,
	oliver.upton@...ux.dev,
	isaku.yamahata@...el.com,
	maz@...nel.org,
	steven.price@....com,
	kai.huang@...el.com,
	rick.p.edgecombe@...el.com,
	James.Bottomley@...senPartnership.com
Subject: [RFC PATCH 1/5] KVM: powerpc: remove remaining traces of KVM_CAP_PPC_RMA

This was only needed for PPC970 support, which is long gone: the
implementation was removed in 2014.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 Documentation/virt/kvm/api.rst | 36 ----------------------------------
 arch/powerpc/kvm/powerpc.c     |  3 ---
 2 files changed, 39 deletions(-)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 8e5dad80b337..85dc04bfad3b 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -2170,42 +2170,6 @@ userspace update the TCE table directly which is useful in some
 circumstances.
 
 
-4.63 KVM_ALLOCATE_RMA
----------------------
-
-:Capability: KVM_CAP_PPC_RMA
-:Architectures: powerpc
-:Type: vm ioctl
-:Parameters: struct kvm_allocate_rma (out)
-:Returns: file descriptor for mapping the allocated RMA
-
-This allocates a Real Mode Area (RMA) from the pool allocated at boot
-time by the kernel.  An RMA is a physically-contiguous, aligned region
-of memory used on older POWER processors to provide the memory which
-will be accessed by real-mode (MMU off) accesses in a KVM guest.
-POWER processors support a set of sizes for the RMA that usually
-includes 64MB, 128MB, 256MB and some larger powers of two.
-
-::
-
-  /* for KVM_ALLOCATE_RMA */
-  struct kvm_allocate_rma {
-	__u64 rma_size;
-  };
-
-The return value is a file descriptor which can be passed to mmap(2)
-to map the allocated RMA into userspace.  The mapped area can then be
-passed to the KVM_SET_USER_MEMORY_REGION ioctl to establish it as the
-RMA for a virtual machine.  The size of the RMA in bytes (which is
-fixed at host kernel boot time) is returned in the rma_size field of
-the argument structure.
-
-The KVM_CAP_PPC_RMA capability is 1 or 2 if the KVM_ALLOCATE_RMA ioctl
-is supported; 2 if the processor requires all virtual machines to have
-an RMA, or 1 if the processor can use an RMA but doesn't require it,
-because it supports the Virtual RMA (VRMA) facility.
-
-
 4.64 KVM_NMI
 ------------
 
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 961aadc71de2..a7e5bc0d969f 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -612,9 +612,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 				r = 8 | 4 | 2 | 1;
 		}
 		break;
-	case KVM_CAP_PPC_RMA:
-		r = 0;
-		break;
 	case KVM_CAP_PPC_HWRNG:
 		r = kvmppc_hwrng_present();
 		break;
-- 
2.46.2