From: Peter Xu <peterx@redhat.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: "Wanpeng Li" <wanpengli@tencent.com>,
"Janosch Frank" <frankja@linux.ibm.com>,
kvm@vger.kernel.org, "David Hildenbrand" <david@redhat.com>,
"James Hogan" <jhogan@kernel.org>,
"Joerg Roedel" <joro@8bytes.org>,
"Cornelia Huck" <cohuck@redhat.com>,
linux-kernel@vger.kernel.org,
"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
kvm-ppc@vger.kernel.org, linux-mips@vger.kernel.org,
"Paul Mackerras" <paulus@ozlabs.org>,
"Christian Borntraeger" <borntraeger@de.ibm.com>,
"Marc Zyngier" <maz@kernel.org>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Vitaly Kuznetsov" <vkuznets@redhat.com>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org,
"Jim Mattson" <jmattson@google.com>
Subject: Re: [PATCH v4 16/19] KVM: Ensure validity of memslot with respect to kvm_get_dirty_log()
Date: Tue, 24 Dec 2019 13:19:30 -0500 [thread overview]
Message-ID: <20191224181930.GC17176@xz-x1> (raw)
In-Reply-To: <20191217204041.10815-17-sean.j.christopherson@intel.com>
On Tue, Dec 17, 2019 at 12:40:38PM -0800, Sean Christopherson wrote:
> +int kvm_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log,
> + int *is_dirty, struct kvm_memory_slot **memslot)
> {
> struct kvm_memslots *slots;
> - struct kvm_memory_slot *memslot;
> int i, as_id, id;
> unsigned long n;
> unsigned long any = 0;
>
> + *memslot = NULL;
> + *is_dirty = 0;
> +
> as_id = log->slot >> 16;
> id = (u16)log->slot;
> if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
> return -EINVAL;
>
> slots = __kvm_memslots(kvm, as_id);
> - memslot = id_to_memslot(slots, id);
> - if (!memslot->dirty_bitmap)
> + *memslot = id_to_memslot(slots, id);
> + if (!(*memslot)->dirty_bitmap)
> return -ENOENT;
>
> - n = kvm_dirty_bitmap_bytes(memslot);
> + kvm_arch_sync_dirty_log(kvm, *memslot);
Should this line belong to previous patch?
> +
> + n = kvm_dirty_bitmap_bytes(*memslot);
>
> for (i = 0; !any && i < n/sizeof(long); ++i)
> - any = memslot->dirty_bitmap[i];
> + any = (*memslot)->dirty_bitmap[i];
>
> - if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
> + if (copy_to_user(log->dirty_bitmap, (*memslot)->dirty_bitmap, n))
> return -EFAULT;
>
> if (any)
> --
> 2.24.1
--
Peter Xu
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next prev parent reply other threads:[~2019-12-24 18:19 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-17 20:40 [PATCH v4 00/19] KVM: Dynamically size memslot arrays Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 01/19] KVM: x86: Allocate new rmap and large page tracking when moving memslot Sean Christopherson
2019-12-17 20:48 ` Sean Christopherson
2019-12-17 21:56 ` Peter Xu
2019-12-17 22:20 ` Sean Christopherson
2019-12-17 22:37 ` Peter Xu
2019-12-17 20:40 ` [PATCH v4 02/19] KVM: Reinstall old memslots if arch preparation fails Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 03/19] KVM: Don't free new memslot if allocation of said memslot fails Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 04/19] KVM: PPC: Move memslot memory allocation into prepare_memory_region() Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 05/19] KVM: x86: Allocate memslot resources during prepare_memory_region() Sean Christopherson
2019-12-17 22:07 ` Peter Xu
2019-12-17 20:40 ` [PATCH v4 06/19] KVM: Drop kvm_arch_create_memslot() Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 07/19] KVM: Explicitly free allocated-but-unused dirty bitmap Sean Christopherson
2019-12-17 22:24 ` Peter Xu
2019-12-17 22:51 ` Sean Christopherson
2019-12-18 16:17 ` Peter Xu
2019-12-17 20:40 ` [PATCH v4 08/19] KVM: Refactor error handling for setting memory region Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 09/19] KVM: Move setting of memslot into helper routine Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 10/19] KVM: Drop "const" attribute from old memslot in commit_memory_region() Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 11/19] KVM: x86: Free arrays for old memslot when moving memslot's base gfn Sean Christopherson
2019-12-17 22:48 ` Peter Xu
2019-12-17 20:40 ` [PATCH v4 12/19] KVM: Move memslot deletion to helper function Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 13/19] KVM: Simplify kvm_free_memslot() and all its descendents Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 14/19] KVM: Clean up local variable usage in __kvm_set_memory_region() Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 15/19] KVM: Provide common implementation for generic dirty log functions Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 16/19] KVM: Ensure validity of memslot with respect to kvm_get_dirty_log() Sean Christopherson
2019-12-24 18:19 ` Peter Xu [this message]
2020-01-14 18:25 ` Sean Christopherson
2020-02-06 22:03 ` Peter Xu
2020-02-07 18:52 ` Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 17/19] KVM: Terminate memslot walks via used_slots Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 18/19] KVM: Dynamically size memslot array based on number of used slots Sean Christopherson
2019-12-17 20:40 ` [PATCH v4 19/19] KVM: selftests: Add test for KVM_SET_USER_MEMORY_REGION Sean Christopherson
2019-12-18 11:29 ` Christian Borntraeger
2019-12-18 11:39 ` Christian Borntraeger
2019-12-18 16:39 ` Sean Christopherson
2020-03-24 9:43 ` Christian Borntraeger
2020-03-24 18:20 ` Sean Christopherson
2019-12-18 11:40 ` [PATCH v4 00/19] KVM: Dynamically size memslot arrays Christian Borntraeger
2019-12-18 18:10 ` Marc Zyngier
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