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Date: Mon, 16 Dec 2019 09:04:16 +0100
From: Christian Borntraeger <borntraeger@...ibm.com>
To: Sean Christopherson <sean.j.christopherson@...el.com>,
James Hogan <jhogan@...nel.org>,
Paul Mackerras <paulus@...abs.org>,
Janosch Frank <frankja@...ux.ibm.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Radim Krčmář <rkrcmar@...hat.com>,
Marc Zyngier <maz@...nel.org>
Cc: David Hildenbrand <david@...hat.com>,
Cornelia Huck <cohuck@...hat.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>,
James Morse <james.morse@....com>,
Julien Thierry <julien.thierry.kdev@...il.com>,
Suzuki K Poulose <suzuki.poulose@....com>,
linux-mips@...r.kernel.org, kvm-ppc@...r.kernel.org,
kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org,
Christoffer Dall <christoffer.dall@....com>
Subject: Re: [PATCH v3 05/15] KVM: Drop kvm_arch_create_memslot()
On 25.10.19 01:07, Sean Christopherson wrote:
> Remove kvm_arch_create_memslot() now that all arch implementations are
> effectively nops. Removing kvm_arch_create_memslot() eliminates the
> possibility for arch specific code to allocate memory prior to setting
> a memslot, which sets the stage for simplifying kvm_free_memslot().
>
> Cc: Janosch Frank <frankja@...ux.ibm.com>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Acked-by: Christian Borntraeger <borntraeger@...ibm.com>
> ---
> arch/mips/kvm/mips.c | 6 ------
> arch/powerpc/kvm/powerpc.c | 6 ------
> arch/s390/kvm/kvm-s390.c | 6 ------
> arch/x86/kvm/x86.c | 6 ------
> include/linux/kvm_host.h | 2 --
> virt/kvm/arm/mmu.c | 6 ------
> virt/kvm/kvm_main.c | 21 +++++++--------------
> 7 files changed, 7 insertions(+), 46 deletions(-)
>
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 1109924560d8..713e5465edb0 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -188,12 +188,6 @@ long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl,
> return -ENOIOCTLCMD;
> }
>
> -int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
> - unsigned long npages)
> -{
> - return 0;
> -}
> -
> void kvm_arch_flush_shadow_all(struct kvm *kvm)
> {
> /* Flush whole GPA */
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 95b4a766b6cb..bb427543f8a3 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -687,12 +687,6 @@ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
> kvmppc_core_free_memslot(kvm, free, dont);
> }
>
> -int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
> - unsigned long npages)
> -{
> - return 0;
> -}
> -
> int kvm_arch_prepare_memory_region(struct kvm *kvm,
> struct kvm_memory_slot *memslot,
> const struct kvm_userspace_memory_region *mem,
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index d047e846e1b9..21f61dae7db1 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -4494,12 +4494,6 @@ vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
> return VM_FAULT_SIGBUS;
> }
>
> -int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
> - unsigned long npages)
> -{
> - return 0;
> -}
> -
> /* Section: memory related */
> int kvm_arch_prepare_memory_region(struct kvm *kvm,
> struct kvm_memory_slot *memslot,
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index fc63b1f07ba9..aed1a4c5c999 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -9626,12 +9626,6 @@ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
> kvm_page_track_free_memslot(free, dont);
> }
>
> -int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
> - unsigned long npages)
> -{
> - return 0;
> -}
> -
> static int kvm_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
> unsigned long npages)
> {
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index a817e446c9aa..273fa081ae91 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -679,8 +679,6 @@ int __kvm_set_memory_region(struct kvm *kvm,
> const struct kvm_userspace_memory_region *mem);
> void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
> struct kvm_memory_slot *dont);
> -int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
> - unsigned long npages);
> void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen);
> int kvm_arch_prepare_memory_region(struct kvm *kvm,
> struct kvm_memory_slot *memslot,
> diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
> index 38b4c910b6c3..f264de85f648 100644
> --- a/virt/kvm/arm/mmu.c
> +++ b/virt/kvm/arm/mmu.c
> @@ -2358,12 +2358,6 @@ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
> {
> }
>
> -int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
> - unsigned long npages)
> -{
> - return 0;
> -}
> -
> void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen)
> {
> }
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 2d354fa11934..9d6af9044304 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -977,12 +977,13 @@ int __kvm_set_memory_region(struct kvm *kvm,
> new.base_gfn = base_gfn;
> new.npages = npages;
> new.flags = mem->flags;
> + new.userspace_addr = mem->userspace_addr;
>
> if (npages) {
> if (!old.npages)
> change = KVM_MR_CREATE;
> else { /* Modify an existing slot. */
> - if ((mem->userspace_addr != old.userspace_addr) ||
> + if ((new.userspace_addr != old.userspace_addr) ||
> (npages != old.npages) ||
> ((new.flags ^ old.flags) & KVM_MEM_READONLY))
> goto out;
> @@ -1017,22 +1018,14 @@ int __kvm_set_memory_region(struct kvm *kvm,
> }
> }
>
> - /* Free page dirty bitmap if unneeded */
> + r = -ENOMEM;
> +
> + /* Allocate/free page dirty bitmap as needed */
> if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
> new.dirty_bitmap = NULL;
> -
> - r = -ENOMEM;
> - if (change == KVM_MR_CREATE) {
> - new.userspace_addr = mem->userspace_addr;
> -
> - if (kvm_arch_create_memslot(kvm, &new, npages))
> - goto out;
> - }
> -
> - /* Allocate page dirty bitmap if needed */
> - if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
> + else if (!new.dirty_bitmap) {
> if (kvm_create_dirty_bitmap(&new) < 0)
> - goto out_free;
> + goto out;
> }
>
> slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT);
>
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