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Message-ID: <764356ef-dd0f-01bd-129c-a821136a4f6e@redhat.com> Date: Wed, 2 Mar 2022 19:36:35 +0100 From: Paolo Bonzini <pbonzini@...hat.com> To: David Woodhouse <dwmw2@...radead.org>, Sean Christopherson <seanjc@...gle.com>, Christian Borntraeger <borntraeger@...ux.ibm.com>, Janosch Frank <frankja@...ux.ibm.com>, Claudio Imbrenda <imbrenda@...ux.ibm.com> Cc: Vitaly Kuznetsov <vkuznets@...hat.com>, Wanpeng Li <wanpengli@...cent.com>, Jim Mattson <jmattson@...gle.com>, Joerg Roedel <joro@...tes.org>, David Hildenbrand <david@...hat.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, David Matlack <dmatlack@...gle.com>, Ben Gardon <bgardon@...gle.com>, Mingwei Zhang <mizhang@...gle.com> Subject: Re: [PATCH v3 26/28] KVM: selftests: Split out helper to allocate guest mem via memfd On 3/1/22 00:36, David Woodhouse wrote: > On Sat, 2022-02-26 at 00:15 +0000, Sean Christopherson wrote: >> Extract the code for allocating guest memory via memfd out of >> vm_userspace_mem_region_add() and into a new helper, kvm_memfd_alloc(). >> A future selftest to populate a guest with the maximum amount of guest >> memory will abuse KVM's memslots to alias guest memory regions to a >> single memfd-backed host region, i.e. needs to back a guest with memfd >> memory without a 1:1 association between a memslot and a memfd instance. >> >> No functional change intended. >> >> Signed-off-by: Sean Christopherson <seanjc@...gle.com> > > While we're at it, please can we make the whole thing go away and just > return failure #ifndef MFD_CLOEXEC, instead of breaking the build on > older userspace? We can just use old school F_SETFD if that's helpful for you. Paolo
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