From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f197.google.com (mail-pl1-f197.google.com [209.85.214.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 369143BFE3E for ; Wed, 26 Aug 2026 09:18:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787735905; cv=none; b=fh3s+mFDUP2IIvh9qo/TCc84cZ03+ybl3BUC1QHeVqluIXghlqa6tZa0IgnRYjoYGCzfQfKvJ7znSW+AP5FOUApTnPNHLzQ2oWDg4UxOvhEH43SQxozCNiAPj1Tz7drjCYgFauSECI1doj607z3LKZOrc/iTYFRcvABkeGKBhLM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787735905; c=relaxed/simple; bh=VvxOQ+1qgozXGsDN24yFoiXB70BiDrOwXWGmg7dflZ0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Roz0uzdTvWSCR2maGg88/y6knXp1b5FT6zV1hyPtg+6LuOh103IjLzROjh1/p9g/kSuyR7aceGf2JBVtrX+cqwTWiPXnSJv9AyOkIDOE/KMiHWTX/v4bzDpOqzsSNk9WUM6dQleX7nXzP+RZN7g7KEDdfR75eajjsYLGhShfFhw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--ackerleytng.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=p1QNf7tm; arc=none smtp.client-ip=209.85.214.197 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--ackerleytng.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="p1QNf7tm" Received: by mail-pl1-f197.google.com with SMTP id d9443c01a7336-2ccb687f82eso10912735ad.3 for ; Wed, 26 Aug 2026 02:18:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1787735901; x=1788340701; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=g2wiHnbE+Ij1tQvsnQSqnQTpOXXjEOrAZMWxy0XisNw=; b=p1QNf7tmUOCrqFUkik4eJIL99zGu5RBI7+t4hGPAAv+/m01iB3d32sJT9Ni2ITUkE7 5dsNxENoqstmmgKNP+87qAzH/YlSChBQEUA2MKgwnOzPHlFWLcddJ1RCUtKU0xeKMvJ5 ob0zh+RNwe6cHRpxXLSoHjsg4WlcmJ2EYmASP9FujkKwWtEL1mblFdtXWx0zH0t161qe XzhfA1hz55fbIVVcRC9NOZ84q6JsSDRJUX7Hag/ZwDnLpmg9KRISxZQqIfHppdVoSWhL F4dMUUenkPlW45kseKgxuC+8ssyqTulIGNPsv6AHoAoN2WUZB7Fl1WkDFjQoQFwTMCRF LoxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787735901; x=1788340701; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=g2wiHnbE+Ij1tQvsnQSqnQTpOXXjEOrAZMWxy0XisNw=; b=YAKwqfTXhz5AcqiLTb7vg4W1bo9AvtgYSBcZpm18upCnrwI8WaFgMo0vw4weXr/NEm lYfHrcPmouPKvVxxh52gMfosGST5mmbpKI14H9Ul6OgDMT9NntsHrhmujP7QcCMoR/X8 Si20XJXc+e2LgjBFzZyYmx8jzaPRsiTyaEk1ZdVRUfcPRs9xMLQE80bmwCXLynDwGPrt 5th9uamLv8fhVlcaQ2v9kZXgF+FphfCukMeKe/80zNv1LLu4yRr0Bk8jQuXZGoo1wnjX 2fFWapOHK26g4YWEIQd2G4EJDm6X1S66bDdj5bwPNQ+XixpDmjtX3oEn9ojQwWquR8Sl sIoQ== X-Forwarded-Encrypted: i=1; AHgh+RrGpmTSAnCEHllP86/xC+Gt0LEYLlMAX6x6Z6KHnpFxUzK4voEnozJBpBDnbnwDySOKv7EZJJV/4+03NP79dSdSRMg=@vger.kernel.org X-Gm-Message-State: AFuF++kuwGuQrC5kLxCMm7YYA0jTzQ1VsmsU58Sj11rQlf9Wfu/vUqxv Mv/R0vEtcw43t3w3mPwXFiD6n3vbMWZOnrtygm8r8sK7MoXjqNHT/gpLqXHJ/8dBIR5ak4FAlBJ C1SV9Gb4RzqwnsSFIP/ZqG176mA== X-Received: from plbmz11.prod.google.com ([2002:a17:903:350b:b0:2ca:cbc9:76fd]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:38c8:b0:2d5:ccb7:12c3 with SMTP id d9443c01a7336-2d7079579a8mr85171415ad.2.1787735901060; Wed, 26 Aug 2026 02:18:21 -0700 (PDT) Date: Wed, 26 Aug 2026 09:18:06 +0000 In-Reply-To: <20260826-gmem-inplace-conversion-v11-0-0a15d8a799aa@google.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260826-gmem-inplace-conversion-v11-0-0a15d8a799aa@google.com> X-Developer-Key: i=ackerleytng@google.com; a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Developer-Signature: v=1; a=ed25519-sha256; t=1787735885; l=3261; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=MYp0jcv/vyqcAp2jfObXcS1n8zbY2OhrXS0jgL07qmI=; b=OjjqRhEDO3WNi+cijL7f8lpbM+OYCuVBl/W4q/2CiXbz6fOaq/lU1MP9wqHNLxp82huANiFAg XO5HfFH8jJwBqR2M0mKoQUKWsQqP9fUpPRG2nMdyg4DpIjwzDgaVUTk X-Mailer: b4 0.16.0 Message-ID: <20260826-gmem-inplace-conversion-v11-8-0a15d8a799aa@google.com> Subject: [PATCH v11 08/46] KVM: Provide generic interface for checking memory private/shared status From: Ackerley Tng To: aik@amd.com, andrew.jones@linux.dev, binbin.wu@linux.intel.com, brauner@kernel.org, chao.p.peng@linux.intel.com, david@kernel.org, jmattson@google.com, jthoughton@google.com, michael.roth@amd.com, oupton@kernel.org, pankaj.gupta@amd.com, qperret@google.com, rick.p.edgecombe@intel.com, rientjes@google.com, shivankg@amd.com, steven.price@arm.com, willy@infradead.org, wyihan@google.com, yan.y.zhao@intel.com, forkloop@google.com, pratyush@kernel.org, suzuki.poulose@arm.com, aneesh.kumar@kernel.org, liam@infradead.org, Paolo Bonzini , Sean Christopherson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Shuah Khan , Shuah Khan , Vishal Annapurve , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Youngjun Park , Qi Zheng , Shakeel Butt , Kiryl Shutsemau , Baoquan He , Jason Gunthorpe , John Hubbard , Peter Xu , tarunsahu@google.com, Fuad Tabba , Vlastimil Babka Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, Ackerley Tng , Xiaoyao Li Content-Type: text/plain; charset="utf-8" From: Sean Christopherson Introduce a generic kvm_is_private_gfn() interface using a static call to determine if a GFN is private. This allows the implementation for checking a GFN's private/shared status to be set at runtime. In preparation for choosing implementations between a guest_memfd lookup and the existing VM attribute lookup, rename the existing VM-attribute-based check to kvm_vm_is_private_gfn() to emphasize that it looks up VM attributes. Signed-off-by: Sean Christopherson Reviewed-by: Xiaoyao Li Reviewed-by: Fuad Tabba Tested-by: Shivank Garg Reviewed-by: Binbin Wu Signed-off-by: Ackerley Tng --- include/linux/kvm_host.h | 14 ++++++++++++-- virt/kvm/kvm_main.c | 15 +++++++++++++++ 2 files changed, 27 insertions(+), 2 deletions(-) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 9b97266f61ec8..3579feb631775 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -2573,16 +2573,26 @@ bool kvm_arch_pre_set_vm_memory_attributes(struct kvm *kvm, bool kvm_arch_post_set_vm_memory_attributes(struct kvm *kvm, struct kvm_gfn_range *range); -static inline bool kvm_is_private_gfn(struct kvm *kvm, gfn_t gfn) +static inline bool kvm_vm_is_private_gfn(struct kvm *kvm, gfn_t gfn) { return kvm_get_vm_memory_attributes(kvm, gfn) & KVM_MEMORY_ATTRIBUTE_PRIVATE; } +#endif /* CONFIG_KVM_VM_MEMORY_ATTRIBUTES */ + +#ifdef kvm_arch_has_private_mem +typedef bool (kvm_is_private_gfn_t)(struct kvm *kvm, gfn_t gfn); +DECLARE_STATIC_CALL(__kvm_is_private_gfn, kvm_is_private_gfn_t); + +static inline bool kvm_is_private_gfn(struct kvm *kvm, gfn_t gfn) +{ + return static_call(__kvm_is_private_gfn)(kvm, gfn); +} #else static inline bool kvm_is_private_gfn(struct kvm *kvm, gfn_t gfn) { return false; } -#endif /* CONFIG_KVM_VM_MEMORY_ATTRIBUTES */ +#endif /* kvm_arch_has_private_mem */ #ifdef CONFIG_KVM_GUEST_MEMFD int kvm_gmem_get_pfn(struct kvm *kvm, struct kvm_memory_slot *slot, diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 91d5af7d60d0f..78278730b2ae4 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2628,6 +2628,20 @@ static int kvm_vm_ioctl_set_mem_attributes(struct kvm *kvm, } #endif /* CONFIG_KVM_VM_MEMORY_ATTRIBUTES */ +#ifdef kvm_arch_has_private_mem +DEFINE_STATIC_CALL_RET0(__kvm_is_private_gfn, kvm_is_private_gfn_t); +EXPORT_STATIC_CALL_GPL(__kvm_is_private_gfn); + +static void kvm_init_memory_attributes(void) +{ +#ifdef CONFIG_KVM_VM_MEMORY_ATTRIBUTES + static_call_update(__kvm_is_private_gfn, kvm_vm_is_private_gfn); +#endif +} +#else +static void kvm_init_memory_attributes(void) { } +#endif + struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) { return __gfn_to_memslot(kvm_memslots(kvm), gfn); @@ -6541,6 +6555,7 @@ int kvm_init(unsigned vcpu_size, unsigned vcpu_align, struct module *module) kvm_preempt_ops.sched_in = kvm_sched_in; kvm_preempt_ops.sched_out = kvm_sched_out; + kvm_init_memory_attributes(); kvm_init_debug(); r = kvm_vfio_ops_init(); -- 2.55.0.887.g758fc8c411-goog