From: "Maciej S. Szmigiero" <mail@maciej.szmigiero.name>
To: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Igor Mammedov <imammedo@redhat.com>,
Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Huacai Chen <chenhuacai@kernel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
Paul Mackerras <paulus@ozlabs.org>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Janosch Frank <frankja@linux.ibm.com>,
David Hildenbrand <david@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
Anup Patel <anup.patel@wdc.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Ben Gardon <bgardon@google.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v7 05/29] KVM: Let/force architectures to deal with arch specific memslot data
Date: Mon, 6 Dec 2021 20:54:11 +0100 [thread overview]
Message-ID: <67dea5f11bbcfd71e3da5986f11e87f5dd4013f9.1638817639.git.maciej.szmigiero@oracle.com> (raw)
In-Reply-To: <cover.1638817637.git.maciej.szmigiero@oracle.com>
From: Sean Christopherson <seanjc@google.com>
Pass the "old" slot to kvm_arch_prepare_memory_region() and force arch
code to handle propagating arch specific data from "new" to "old" when
necessary. This is a baby step towards dynamically allocating "new" from
the get go, and is a (very) minor performance boost on x86 due to not
unnecessarily copying arch data.
For PPC HV, copy the rmap in the !CREATE and !DELETE paths, i.e. for MOVE
and FLAGS_ONLY. This is functionally a nop as the previous behavior
would overwrite the pointer for CREATE, and eventually discard/ignore it
for DELETE.
For x86, copy the arch data only for FLAGS_ONLY changes. Unlike PPC HV,
x86 needs to reallocate arch data in the MOVE case as the size of x86's
allocations depend on the alignment of the memslot's gfn.
Opportunistically tweak kvm_arch_prepare_memory_region()'s param order to
match the "commit" prototype.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
[mss: add missing RISCV kvm_arch_prepare_memory_region() change]
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
---
arch/arm64/kvm/mmu.c | 7 ++++---
arch/mips/kvm/mips.c | 3 ++-
arch/powerpc/include/asm/kvm_ppc.h | 10 ++++++----
arch/powerpc/kvm/book3s.c | 12 ++++++------
arch/powerpc/kvm/book3s_hv.c | 17 ++++++++++-------
arch/powerpc/kvm/book3s_pr.c | 9 +++++----
arch/powerpc/kvm/booke.c | 5 +++--
arch/powerpc/kvm/powerpc.c | 5 +++--
arch/riscv/kvm/mmu.c | 7 ++++---
arch/s390/kvm/kvm-s390.c | 3 ++-
arch/x86/kvm/x86.c | 15 +++++++++++----
include/linux/kvm_host.h | 3 ++-
virt/kvm/kvm_main.c | 5 +----
13 files changed, 59 insertions(+), 42 deletions(-)
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 326cdfec74a1..5d474360bf6c 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1486,8 +1486,9 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
- struct kvm_memory_slot *memslot,
const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
hva_t hva = mem->userspace_addr;
@@ -1502,7 +1503,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
* Prevent userspace from creating a memory region outside of the IPA
* space addressable by the KVM guest IPA space.
*/
- if ((memslot->base_gfn + memslot->npages) > (kvm_phys_size(kvm) >> PAGE_SHIFT))
+ if ((new->base_gfn + new->npages) > (kvm_phys_size(kvm) >> PAGE_SHIFT))
return -EFAULT;
mmap_read_lock(current->mm);
@@ -1536,7 +1537,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
if (vma->vm_flags & VM_PFNMAP) {
/* IO region dirty page logging not allowed */
- if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES) {
+ if (new->flags & KVM_MEM_LOG_DIRTY_PAGES) {
ret = -EINVAL;
break;
}
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 043204cd585f..b2ce10784eb0 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -214,8 +214,9 @@ void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
- struct kvm_memory_slot *memslot,
const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
return 0;
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 671fbd1a765e..b01760dd1374 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -200,12 +200,13 @@ extern void kvmppc_core_destroy_vm(struct kvm *kvm);
extern void kvmppc_core_free_memslot(struct kvm *kvm,
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,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
enum kvm_mr_change change);
extern void kvmppc_core_commit_memory_region(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem,
- const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *old,
const struct kvm_memory_slot *new,
enum kvm_mr_change change);
extern int kvm_vm_ioctl_get_smmu_info(struct kvm *kvm,
@@ -274,12 +275,13 @@ struct kvmppc_ops {
int (*get_dirty_log)(struct kvm *kvm, struct kvm_dirty_log *log);
void (*flush_memslot)(struct kvm *kvm, struct kvm_memory_slot *memslot);
int (*prepare_memory_region)(struct kvm *kvm,
- struct kvm_memory_slot *memslot,
const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
enum kvm_mr_change change);
void (*commit_memory_region)(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem,
- const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *old,
const struct kvm_memory_slot *new,
enum kvm_mr_change change);
bool (*unmap_gfn_range)(struct kvm *kvm, struct kvm_gfn_range *range);
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index b785f6772391..8250e8308674 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -847,17 +847,17 @@ void kvmppc_core_flush_memslot(struct kvm *kvm, struct kvm_memory_slot *memslot)
}
int kvmppc_core_prepare_memory_region(struct kvm *kvm,
- struct kvm_memory_slot *memslot,
- const struct kvm_userspace_memory_region *mem,
- enum kvm_mr_change change)
+ const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
+ enum kvm_mr_change change)
{
- return kvm->arch.kvm_ops->prepare_memory_region(kvm, memslot, mem,
- change);
+ return kvm->arch.kvm_ops->prepare_memory_region(kvm, mem, old, new, change);
}
void kvmppc_core_commit_memory_region(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem,
- const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *old,
const struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 32873c6985f9..d7594d49d288 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -4854,17 +4854,20 @@ static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *slot)
}
static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
- struct kvm_memory_slot *slot,
- const struct kvm_userspace_memory_region *mem,
- enum kvm_mr_change change)
+ const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
+ enum kvm_mr_change change)
{
unsigned long npages = mem->memory_size >> PAGE_SHIFT;
if (change == KVM_MR_CREATE) {
- slot->arch.rmap = vzalloc(array_size(npages,
- sizeof(*slot->arch.rmap)));
- if (!slot->arch.rmap)
+ new->arch.rmap = vzalloc(array_size(npages,
+ sizeof(*new->arch.rmap)));
+ if (!new->arch.rmap)
return -ENOMEM;
+ } else if (change != KVM_MR_DELETE) {
+ new->arch.rmap = old->arch.rmap;
}
return 0;
@@ -4872,7 +4875,7 @@ static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem,
- const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *old,
const struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index f981f2c1b7e9..6a94831487ae 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -1899,16 +1899,17 @@ static void kvmppc_core_flush_memslot_pr(struct kvm *kvm,
}
static int kvmppc_core_prepare_memory_region_pr(struct kvm *kvm,
- struct kvm_memory_slot *memslot,
- const struct kvm_userspace_memory_region *mem,
- enum kvm_mr_change change)
+ const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
+ enum kvm_mr_change change)
{
return 0;
}
static void kvmppc_core_commit_memory_region_pr(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem,
- const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *old,
const struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 42e418153324..47f691387171 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -1821,8 +1821,9 @@ void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
}
int kvmppc_core_prepare_memory_region(struct kvm *kvm,
- struct kvm_memory_slot *memslot,
const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
return 0;
@@ -1830,7 +1831,7 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm,
void kvmppc_core_commit_memory_region(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem,
- const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *old,
const struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 166a55dc744a..cf0422c41359 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -698,11 +698,12 @@ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
- struct kvm_memory_slot *memslot,
const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
- return kvmppc_core_prepare_memory_region(kvm, memslot, mem, change);
+ return kvmppc_core_prepare_memory_region(kvm, mem, old, new, change);
}
void kvm_arch_commit_memory_region(struct kvm *kvm,
diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index fc058ff5f4b6..50380f525345 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -477,8 +477,9 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
- struct kvm_memory_slot *memslot,
const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
hva_t hva = mem->userspace_addr;
@@ -494,7 +495,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
* Prevent userspace from creating a memory region outside of the GPA
* space addressable by the KVM guest GPA space.
*/
- if ((memslot->base_gfn + memslot->npages) >=
+ if ((new->base_gfn + new->npages) >=
(stage2_gpa_size >> PAGE_SHIFT))
return -EFAULT;
@@ -541,7 +542,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
pa += vm_start - vma->vm_start;
/* IO region dirty page logging not allowed */
- if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES) {
+ if (new->flags & KVM_MEM_LOG_DIRTY_PAGES) {
ret = -EINVAL;
goto out;
}
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 33bc0a1cb328..3d943c78a770 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -5007,8 +5007,9 @@ vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
/* Section: memory related */
int kvm_arch_prepare_memory_region(struct kvm *kvm,
- struct kvm_memory_slot *memslot,
const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
/* A few sanity checks. We can have memory slots which have to be
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a05a26471f19..d6362406a82e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11723,13 +11723,20 @@ void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen)
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
- struct kvm_memory_slot *memslot,
- const struct kvm_userspace_memory_region *mem,
- enum kvm_mr_change change)
+ const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
+ enum kvm_mr_change change)
{
if (change == KVM_MR_CREATE || change == KVM_MR_MOVE)
- return kvm_alloc_memslot_metadata(kvm, memslot,
+ return kvm_alloc_memslot_metadata(kvm, new,
mem->memory_size >> PAGE_SHIFT);
+
+ if (change == KVM_MR_FLAGS_ONLY)
+ memcpy(&new->arch, &old->arch, sizeof(old->arch));
+ else if (WARN_ON_ONCE(change != KVM_MR_DELETE))
+ return -EIO;
+
return 0;
}
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index a6830966f8eb..1024b40b1567 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -835,8 +835,9 @@ int __kvm_set_memory_region(struct kvm *kvm,
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,
const struct kvm_userspace_memory_region *mem,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
enum kvm_mr_change change);
void kvm_arch_commit_memory_region(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem,
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 683a5ef6f71e..67b081d477d8 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1638,10 +1638,7 @@ static int kvm_set_memslot(struct kvm *kvm,
old.as_id = new->as_id;
}
- /* Copy the arch-specific data, again after (re)acquiring slots_arch_lock. */
- memcpy(&new->arch, &old.arch, sizeof(old.arch));
-
- r = kvm_arch_prepare_memory_region(kvm, new, mem, change);
+ r = kvm_arch_prepare_memory_region(kvm, mem, &old, new, change);
if (r)
goto out_slots;
next prev parent reply other threads:[~2021-12-06 19:55 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-06 19:54 [PATCH v7 00/29] KVM: Scalable memslots implementation Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 01/29] KVM: Require total number of memslot pages to fit in an unsigned long Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 02/29] KVM: Open code kvm_delete_memslot() into its only caller Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 03/29] KVM: Resync only arch fields when slots_arch_lock gets reacquired Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 04/29] KVM: Use "new" memslot's address space ID instead of dedicated param Maciej S. Szmigiero
2021-12-06 19:54 ` Maciej S. Szmigiero [this message]
2021-12-06 19:54 ` [PATCH v7 06/29] KVM: arm64: Use "new" memslot instead of userspace memory region Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 07/29] KVM: MIPS: Drop pr_debug from memslot commit to avoid using "mem" Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 08/29] KVM: PPC: Avoid referencing userspace memory region in memslot updates Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 09/29] KVM: s390: Use "new" memslot instead of userspace memory region Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 10/29] KVM: x86: " Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 11/29] KVM: RISC-V: " Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 12/29] KVM: Stop passing kvm_userspace_memory_region to arch memslot hooks Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 13/29] KVM: Use prepare/commit hooks to handle generic memslot metadata updates Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 14/29] KVM: x86: Don't assume old/new memslots are non-NULL at memslot commit Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 15/29] KVM: s390: Skip gfn/size sanity checks on memslot DELETE or FLAGS_ONLY Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 16/29] KVM: Don't make a full copy of the old memslot in __kvm_set_memory_region() Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 17/29] KVM: x86: Don't call kvm_mmu_change_mmu_pages() if the count hasn't changed Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 18/29] KVM: x86: Use nr_memslot_pages to avoid traversing the memslots array Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 19/29] KVM: Integrate gfn_to_memslot_approx() into search_memslots() Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 20/29] KVM: Move WARN on invalid memslot index to update_memslots() Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 21/29] KVM: Resolve memslot ID via a hash table instead of via a static array Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 22/29] KVM: Use interval tree to do fast hva lookup in memslots Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 23/29] KVM: s390: Introduce kvm_s390_get_gfn_end() Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 24/29] KVM: Keep memslots in tree-based structures instead of array-based ones Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 25/29] KVM: Call kvm_arch_flush_shadow_memslot() on the old slot in kvm_invalidate_memslot() Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 26/29] KVM: Optimize gfn lookup in kvm_zap_gfn_range() Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 27/29] KVM: Optimize overlapping memslots check Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 28/29] KVM: Wait 'til the bitter end to initialize the "new" memslot Maciej S. Szmigiero
2021-12-06 19:54 ` [PATCH v7 29/29] KVM: Dynamically allocate "new" memslots from the get-go Maciej S. Szmigiero
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