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Message-Id: <20191024230744.14543-6-sean.j.christopherson@intel.com>
Date: Thu, 24 Oct 2019 16:07:34 -0700
From: Sean Christopherson <sean.j.christopherson@...el.com>
To: James Hogan <jhogan@...nel.org>,
Paul Mackerras <paulus@...abs.org>,
Christian Borntraeger <borntraeger@...ibm.com>,
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>,
Sean Christopherson <sean.j.christopherson@...el.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: [PATCH v3 05/15] KVM: Drop kvm_arch_create_memslot()
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>
---
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);
--
2.22.0
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