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Peter Anvin" , Hugh Dickins , Jeff Layton , "J . Bruce Fields" , Andrew Morton , Shuah Khan , Mike Rapoport , Steven Price , "Maciej S . Szmigiero" , Vlastimil Babka , Vishal Annapurve , Yu Zhang , "Kirill A . Shutemov" , luto@kernel.org, jun.nakajima@intel.com, dave.hansen@intel.com, ak@linux.intel.com, david@redhat.com, aarcange@redhat.com, ddutile@redhat.com, dhildenb@redhat.com, Quentin Perret , tabba@google.com, Michael Roth , mhocko@suse.com, wei.w.wang@intel.com Subject: Re: [PATCH v10 2/9] KVM: Introduce per-page memory attributes Message-ID: References: <20221202061347.1070246-1-chao.p.peng@linux.intel.com> <20221202061347.1070246-3-chao.p.peng@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20221202061347.1070246-3-chao.p.peng@linux.intel.com> X-Rspamd-Queue-Id: 7D9E340018 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: 8ok4twzzykjkatnmz3rtu3ryiuqoj1ng X-HE-Tag: 1671203385-576373 X-HE-Meta: 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 ejJyCpys 1IrqRi5LLPDPm0jdBFUVwSJPuHzvnrvyO5tfTv862H5Tgv0baRHroEAaDO35MRMA05LkgR7yTBN88+9HuOw4UNbAOmg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Dec 02, 2022 at 02:13:40PM +0800, Chao Peng wrote: > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index 1782c4555d94..7f0f5e9f2406 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -1150,6 +1150,9 @@ static struct kvm *kvm_create_vm(unsigned long type, const char *fdname) > spin_lock_init(&kvm->mn_invalidate_lock); > rcuwait_init(&kvm->mn_memslots_update_rcuwait); > xa_init(&kvm->vcpu_array); > +#ifdef CONFIG_HAVE_KVM_MEMORY_ATTRIBUTES > + xa_init(&kvm->mem_attr_array); > +#endif if (IS_ENABLED(CONFIG_HAVE_KVM_MEMORY_ATTRIBUTES)) ... would at least remove the ugly ifdeffery. Or you could create wrapper functions for that xa_init() and xa_destroy() and put the ifdeffery in there. > @@ -2323,6 +2329,49 @@ static int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm, > } > #endif /* CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT */ > > +#ifdef CONFIG_HAVE_KVM_MEMORY_ATTRIBUTES > +static u64 kvm_supported_mem_attributes(struct kvm *kvm) I guess that function should have a verb in the name: kvm_get_supported_mem_attributes() > +static int kvm_vm_ioctl_set_mem_attributes(struct kvm *kvm, > + struct kvm_memory_attributes *attrs) > +{ > + gfn_t start, end; > + unsigned long i; > + void *entry; > + u64 supported_attrs = kvm_supported_mem_attributes(kvm); > + > + /* flags is currently not used. */ > + if (attrs->flags) > + return -EINVAL; > + if (attrs->attributes & ~supported_attrs) > + return -EINVAL; > + if (attrs->size == 0 || attrs->address + attrs->size < attrs->address) > + return -EINVAL; > + if (!PAGE_ALIGNED(attrs->address) || !PAGE_ALIGNED(attrs->size)) > + return -EINVAL; Dunno, shouldn't those issue some sort of an error message so that the caller knows where it failed? Or at least return different retvals which signal what the problem is? > + start = attrs->address >> PAGE_SHIFT; > + end = (attrs->address + attrs->size - 1 + PAGE_SIZE) >> PAGE_SHIFT; > + > + entry = attrs->attributes ? xa_mk_value(attrs->attributes) : NULL; > + > + mutex_lock(&kvm->lock); > + for (i = start; i < end; i++) > + if (xa_err(xa_store(&kvm->mem_attr_array, i, entry, > + GFP_KERNEL_ACCOUNT))) > + break; > + mutex_unlock(&kvm->lock); > + > + attrs->address = i << PAGE_SHIFT; > + attrs->size = (end - i) << PAGE_SHIFT; > + > + return 0; > +} -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette