[PATCH v4 13/19] KVM: Simplify kvm_free_memslot() and all its descendents

From: Sean Christopherson
Date: Tue Dec 17 2019 - 15:41:15 EST

Now that all callers of kvm_free_memslot() pass NULL for @dont, remove
the param from the top-level routine and all arch's implementations.

No functional change intended.

Tested-by: Christoffer Dall <christoffer.dall@xxxxxxx>
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
---
arch/mips/include/asm/kvm_host.h | 2 +-
arch/powerpc/include/asm/kvm_ppc.h | 6 ++----
arch/powerpc/kvm/book3s.c | 5 ++---
arch/powerpc/kvm/book3s_hv.c | 9 +++------
arch/powerpc/kvm/book3s_pr.c | 3 +--
arch/powerpc/kvm/booke.c | 3 +--
arch/powerpc/kvm/powerpc.c | 5 ++---
arch/s390/include/asm/kvm_host.h | 2 +-
arch/x86/include/asm/kvm_page_track.h | 3 +--
arch/x86/kvm/mmu/page_track.c | 15 ++++++---------
arch/x86/kvm/x86.c | 21 ++++++++-------------
include/linux/kvm_host.h | 3 +--
virt/kvm/arm/mmu.c | 3 +--
virt/kvm/kvm_main.c | 18 +++++++-----------
14 files changed, 37 insertions(+), 61 deletions(-)

diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index 41204a49cf95..2c343c346b79 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -1133,7 +1133,7 @@ extern unsigned long kvm_mips_get_ramsize(struct kvm *kvm);
static inline void kvm_arch_hardware_unsetup(void) {}
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_free_memslot(struct kvm *kvm,
- struct kvm_memory_slot *free, struct kvm_memory_slot *dont) {}
+ struct kvm_memory_slot *slot) {}
static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 4df042355356..033501d65340 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -201,8 +201,7 @@ extern void kvm_free_hpt_cma(struct page *page, unsigned long nr_pages);
extern int kvmppc_core_init_vm(struct kvm *kvm);
extern void kvmppc_core_destroy_vm(struct kvm *kvm);
extern void kvmppc_core_free_memslot(struct kvm *kvm,
- struct kvm_memory_slot *free,
- struct kvm_memory_slot *dont);
+ struct kvm_memory_slot *slot);
extern int kvmppc_core_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,
const struct kvm_userspace_memory_region *mem,
@@ -292,8 +291,7 @@ struct kvmppc_ops {
int (*test_age_hva)(struct kvm *kvm, unsigned long hva);
void (*set_spte_hva)(struct kvm *kvm, unsigned long hva, pte_t pte);
void (*mmu_destroy)(struct kvm_vcpu *vcpu);
- void (*free_memslot)(struct kvm_memory_slot *free,
- struct kvm_memory_slot *dont);
+ void (*free_memslot)(struct kvm_memory_slot *slot);
int (*init_vm)(struct kvm *kvm);
void (*destroy_vm)(struct kvm *kvm);
int (*get_smmu_info)(struct kvm *kvm, struct kvm_ppc_smmu_info *info);
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 2480150646ae..b1c9b4d11b2a 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -809,10 +809,9 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
return kvm->arch.kvm_ops->get_dirty_log(kvm, log);
}

-void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
- struct kvm_memory_slot *dont)
+void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
{
- kvm->arch.kvm_ops->free_memslot(free, dont);
+ kvm->arch.kvm_ops->free_memslot(slot);
}

void kvmppc_core_flush_memslot(struct kvm *kvm, struct kvm_memory_slot *memslot)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index b265d7511f3f..04d5b7cf874f 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -4457,13 +4457,10 @@ static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
return r;
}

-static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free,
- struct kvm_memory_slot *dont)
+static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *slot)
{
- if (!dont || free->arch.rmap != dont->arch.rmap) {
- vfree(free->arch.rmap);
- free->arch.rmap = NULL;
- }
+ vfree(slot->arch.rmap);
+ slot->arch.rmap = NULL;
}

static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index fc0d9432013f..d2ee00bc7077 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -1955,8 +1955,7 @@ static void kvmppc_core_commit_memory_region_pr(struct kvm *kvm,
return;
}

-static void kvmppc_core_free_memslot_pr(struct kvm_memory_slot *free,
- struct kvm_memory_slot *dont)
+static void kvmppc_core_free_memslot_pr(struct kvm_memory_slot *slot)
{
return;
}
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index cf2845e147c5..a22ff567724a 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -1801,8 +1801,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
return -ENOTSUPP;
}

-void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
- struct kvm_memory_slot *dont)
+void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
{
}

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 6fd61b9dd783..587d51f420e2 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -685,10 +685,9 @@ long kvm_arch_dev_ioctl(struct file *filp,
return -EINVAL;
}

-void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
- struct kvm_memory_slot *dont)
+void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
{
- kvmppc_core_free_memslot(kvm, free, dont);
+ kvmppc_core_free_memslot(kvm, slot);
}

int kvm_arch_prepare_memory_region(struct kvm *kvm,
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 02f4c21c57f6..ecb50d88347d 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -917,7 +917,7 @@ static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
static inline void kvm_arch_free_memslot(struct kvm *kvm,
- struct kvm_memory_slot *free, struct kvm_memory_slot *dont) {}
+ struct kvm_memory_slot *slot) {}
static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}
static inline void kvm_arch_flush_shadow_all(struct kvm *kvm) {}
static inline void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h
index 172f9749dbb2..87bd6025d91d 100644
--- a/arch/x86/include/asm/kvm_page_track.h
+++ b/arch/x86/include/asm/kvm_page_track.h
@@ -49,8 +49,7 @@ struct kvm_page_track_notifier_node {
void kvm_page_track_init(struct kvm *kvm);
void kvm_page_track_cleanup(struct kvm *kvm);

-void kvm_page_track_free_memslot(struct kvm_memory_slot *free,
- struct kvm_memory_slot *dont);
+void kvm_page_track_free_memslot(struct kvm_memory_slot *slot);
int kvm_page_track_create_memslot(struct kvm_memory_slot *slot,
unsigned long npages);

diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c
index 3521e2d176f2..d125ec379c79 100644
--- a/arch/x86/kvm/mmu/page_track.c
+++ b/arch/x86/kvm/mmu/page_track.c
@@ -19,17 +19,14 @@

#include "mmu.h"

-void kvm_page_track_free_memslot(struct kvm_memory_slot *free,
- struct kvm_memory_slot *dont)
+void kvm_page_track_free_memslot(struct kvm_memory_slot *slot)
{
int i;

- for (i = 0; i < KVM_PAGE_TRACK_MAX; i++)
- if (!dont || free->arch.gfn_track[i] !=
- dont->arch.gfn_track[i]) {
- kvfree(free->arch.gfn_track[i]);
- free->arch.gfn_track[i] = NULL;
- }
+ for (i = 0; i < KVM_PAGE_TRACK_MAX; i++) {
+ kvfree(slot->arch.gfn_track[i]);
+ slot->arch.gfn_track[i] = NULL;
+ }
}

int kvm_page_track_create_memslot(struct kvm_memory_slot *slot,
@@ -48,7 +45,7 @@ int kvm_page_track_create_memslot(struct kvm_memory_slot *slot,
return 0;

track_free:
- kvm_page_track_free_memslot(slot, NULL);
+ kvm_page_track_free_memslot(slot);
return -ENOMEM;
}

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5f890812fac3..50bef3195533 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9675,27 +9675,22 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
kvm_hv_destroy_vm(kvm);
}

-void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
- struct kvm_memory_slot *dont)
+void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
{
int i;

for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
- if (!dont || free->arch.rmap[i] != dont->arch.rmap[i]) {
- kvfree(free->arch.rmap[i]);
- free->arch.rmap[i] = NULL;
- }
+ kvfree(slot->arch.rmap[i]);
+ slot->arch.rmap[i] = NULL;
+
if (i == 0)
continue;

- if (!dont || free->arch.lpage_info[i - 1] !=
- dont->arch.lpage_info[i - 1]) {
- kvfree(free->arch.lpage_info[i - 1]);
- free->arch.lpage_info[i - 1] = NULL;
- }
+ kvfree(slot->arch.lpage_info[i - 1]);
+ slot->arch.lpage_info[i - 1] = NULL;
}

- kvm_page_track_free_memslot(free, dont);
+ kvm_page_track_free_memslot(slot);
}

static int kvm_alloc_memslot_metadata(struct kvm_memory_slot *slot,
@@ -9887,7 +9882,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,

/* Free the arrays associated with the old memslot. */
if (change == KVM_MR_MOVE)
- kvm_arch_free_memslot(kvm, old, NULL);
+ kvm_arch_free_memslot(kvm, old);
}

void kvm_arch_flush_shadow_all(struct kvm *kvm)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 7d86dbb467f7..8343ac5ee7a8 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -672,8 +672,7 @@ int kvm_set_memory_region(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem);
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);
+void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot);
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 4941746929ab..c49a3d5baad2 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -2353,8 +2353,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
return ret;
}

-void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
- struct kvm_memory_slot *dont)
+void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
{
}

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 50e5aec0c15c..2fa40c3e7961 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -583,18 +583,14 @@ static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
memslot->dirty_bitmap = NULL;
}

-/*
- * Free any memory in @free but not in @dont.
- */
-static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
- struct kvm_memory_slot *dont)
+static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
{
- if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
- kvm_destroy_dirty_bitmap(free);
+ kvm_destroy_dirty_bitmap(slot);

- kvm_arch_free_memslot(kvm, free, dont);
+ kvm_arch_free_memslot(kvm, slot);

- free->npages = 0;
+ slot->flags = 0;
+ slot->npages = 0;
}

static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
@@ -605,7 +601,7 @@ static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
return;

kvm_for_each_memslot(memslot, slots)
- kvm_free_memslot(kvm, memslot, NULL);
+ kvm_free_memslot(kvm, memslot);

kvfree(slots);
}
@@ -1063,7 +1059,7 @@ static int kvm_delete_memslot(struct kvm *kvm,
if (r)
return r;

- kvm_free_memslot(kvm, old, NULL);
+ kvm_free_memslot(kvm, old);
return 0;
}

--
2.24.1