Re: [PATCH v7 3/9] KVM: guest_memfd: Allow host to map guest_memfd() pages

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To: Fuad Tabba <tabba@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, linux-arm-msm@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx
Subject: Re: [PATCH v7 3/9] KVM: guest_memfd: Allow host to map guest_memfd() pages
From: David Hildenbrand <david@xxxxxxxxxx>
Date: Mon, 14 Apr 2025 12:06:42 +0200
Cc: pbonzini@xxxxxxxxxx, chenhuacai@xxxxxxxxxx, mpe@xxxxxxxxxxxxxx, anup@xxxxxxxxxxxxxx, paul.walmsley@xxxxxxxxxx, palmer@xxxxxxxxxxx, aou@xxxxxxxxxxxxxxxxx, seanjc@xxxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx, brauner@xxxxxxxxxx, willy@xxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, xiaoyao.li@xxxxxxxxx, yilun.xu@xxxxxxxxx, chao.p.peng@xxxxxxxxxxxxxxx, jarkko@xxxxxxxxxx, amoorthy@xxxxxxxxxx, dmatlack@xxxxxxxxxx, isaku.yamahata@xxxxxxxxx, mic@xxxxxxxxxxx, vbabka@xxxxxxx, vannapurve@xxxxxxxxxx, ackerleytng@xxxxxxxxxx, mail@xxxxxxxxxxxxxxxxxxxxx, michael.roth@xxxxxxx, wei.w.wang@xxxxxxxxx, liam.merwick@xxxxxxxxxx, isaku.yamahata@xxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, suzuki.poulose@xxxxxxx, steven.price@xxxxxxx, quic_eberman@xxxxxxxxxxx, quic_mnalajal@xxxxxxxxxxx, quic_tsoni@xxxxxxxxxxx, quic_svaddagi@xxxxxxxxxxx, quic_cvanscha@xxxxxxxxxxx, quic_pderrin@xxxxxxxxxxx, quic_pheragu@xxxxxxxxxxx, catalin.marinas@xxxxxxx, james.morse@xxxxxxx, yuzenghui@xxxxxxxxxx, oliver.upton@xxxxxxxxx, maz@xxxxxxxxxx, will@xxxxxxxxxx, qperret@xxxxxxxxxx, keirf@xxxxxxxxxx, roypat@xxxxxxxxxxxx, shuah@xxxxxxxxxx, hch@xxxxxxxxxxxxx, jgg@xxxxxxxxxx, rientjes@xxxxxxxxxx, jhubbard@xxxxxxxxxx, fvdl@xxxxxxxxxx, hughd@xxxxxxxxxx, jthoughton@xxxxxxxxxx, peterx@xxxxxxxxxx
In-reply-to: <20250318161823.4005529-4-tabba@google.com>
Organization: Red Hat
References: <20250318161823.4005529-1-tabba@google.com> <20250318161823.4005529-4-tabba@google.com>
User-agent: Mozilla Thunderbird

+	/*
+	 * Shared folios would not be marked as "guestmem" so far, and we only
+	 * expect shared folios at this point.
+	 */
+	if (WARN_ON_ONCE(folio_test_guestmem(folio)))  {
+		ret = VM_FAULT_SIGBUS;
+		goto out_folio;
+	}


With that dropped for now

Acked-by: David Hildenbrand <david@xxxxxxxxxx>

--
Cheers,

David / dhildenb

Follow-Ups:
- Re: [PATCH v7 3/9] KVM: guest_memfd: Allow host to map guest_memfd() pages
  - From: Fuad Tabba

References:
- [PATCH v7 0/9] KVM: Mapping guest_memfd backed memory at the host for software protected VMs
  - From: Fuad Tabba
- [PATCH v7 3/9] KVM: guest_memfd: Allow host to map guest_memfd() pages
  - From: Fuad Tabba

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