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h=From:Subject:Date:To:Cc; b=ke5hoBPCBLJfy7v18TrpdtuvZX5gMfZZthDjmoILRiAamuDXoSFO3XcwRb11byypO gUkfNiPCaQkZU7GB6HMSY8QEB105yNJawxQaP6WADohh06xSb1VdKXlXBwG0jONw8Y HsjiaGzJYDz9ykUVvwsCapLoCTz+EQ9cpQNGJqdGr0vefP7rqDw/8LdwNc/Zhy+eD2 mcMAMfoBGZP45+TNodejhQskuczfCfx5wwcq2kSpZFJJHVNyEaIGIaEkUsZ6eX2QA3 QDbdGvNGmUNfPVShK5fwPPcmmkO7w3UGCig3HHWTFlnTd1OYvdgRAtulAxPFq3a6tV iZpW+SWVbrZ8w== From: "Mike Rapoport (Microsoft)" Subject: [PATCH v2 0/4] KVM: s390: replace page allocator calls with kzalloc() Date: Sun, 06 Sep 2026 11:27:08 +0300 Message-Id: <20260906-s390-kvm-v2-0-2cf6434e6646@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAAAAAAAC/0WOzQ6CMBCEX4X07JJtCX+efA/DgZYVKlrMFhsN4 d2lcPD4zczO7CI8sSUvzskimIL1dnIbqFMizNC6nsB2GwuFqsBKVeCzGmEMT1Aoc41dWZadEVv 8xXSzn73q2hzs3/pOZo73MaFbT6C5dWaI0o5lmgEbGe3B+nni7/5KkLHmWK1R/VeDBIRMG6yrI s9Ry8tI7OiRTtyLZl3XH4EKmajSAAAA X-Change-ID: 20260828-s390-kvm-2015b0d777dc To: Christian Borntraeger , Claudio Imbrenda , Janosch Frank Cc: Alexander Gordeev , David Hildenbrand , Heiko Carstens , Mike Rapoport , Sven Schnelle , Vasily Gorbik , Vlastimil Babka , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org X-Mailer: b4 0.17-dev X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 5959940008 X-Stat-Signature: 8x7s99ite588s7qkfxzmub4sf9noo54h X-HE-Tag: 1788683244-472147 X-HE-Meta: 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 0URUqTwl zFMRf7P3lLoBhMcg8n8ZH80n0cu/qRa6EOLv1uk3FyCmMmnjDqPN4NPyw5OqRKH2zbxo3SO5Ub0mu9rw9fovw6a1gTyulxF3vxOuYdsl5ffw/db2q5Nn6zf3dWDNC9vqsnO+N0gpSyM+/jzLLVMtmYpC3PyMk06pEjtPqdu2tHMl2539CuRCNG4evyi+alHKBlI5ATjoZ8DOuDUmsbfWJfGQf8z/zwKLgi/NogFG2xWDFJBQgXlJvfWTHdvatgjliNZEYAbhKmf28BLL3wcr1Xl9KQfaGoorKAubLbwiSEGTopSc3Aa4H5gWLFmcnd37mp1pklpjwp2eW1+/ujvIJBJl2ZJnIMqwBU9pj Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This is a (small) part of larger work of replacing page allocator calls with kmalloc. My initial intention a few month ago was to remove ugly casts [1], but then willy pointed out that Linus objected to something like this [2] and it looks like more than a decade old technical debt. Largely, anything that doesn't need struct page (or a memdesc in the future) should just use kmalloc() or kvmalloc() to allocate memory. kmalloc() guarantees alignment, physical contiguity and working virt_to_phys() and beside nicer API that returns void * on alloc and doesn't require to know the allocation size on free, kmalloc() provides better debugging capabilities than page allocator. Another thing is that touching these allocation sites gives the reviewers opportunity to see if a PAGE_SIZE buffer is actually needed or maybe another size is appropriate. For larger allocations that don't need physically contiguous memory kvmalloc() can be a better option that __get_free_pages() because under memory pressure it's is easier to allocate several order-0 pages than a physically contiguous chunk with the same number of pages. And last, but not least, removing needless calls to page allocator should help with memdesc (aka project folio) conversion. There will be way less places to audit to see if the user was actually using struct page. Also in git: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git gfp-to-kmalloc/s390-kvm [1] https://lore.kernel.org/all/20251018093002.3660549-1-rppt@kernel.org/ [2] https://lore.kernel.org/all/CA+55aFwp4iy4rtX2gE2WjBGFL=NxMVnoFeHqYa2j1dYOMMGqxg@mail.gmail.com/ --- v2 changes: * Mask out the next CBR entry offset SIE stores in the low bits of cbrlo before handing the address to kfree() * Use __free(kfree) in handle_sthyi() v1: https://patch.msgid.link/20260902-s390-kvm-v1-0-3bc0986550b1@kernel.org --- Mike Rapoport (Microsoft) (4): KVM: s390: Replace get_zeroed_page() with kzalloc() for the STHYI buffer KVM: s390: Replace get_zeroed_page() with kzalloc() for the STSI buffer KVM: s390: Replace get_zeroed_page() with kzalloc() for the GIB KVM: s390: Replace get_zeroed_page() with kzalloc() for sie_page2 and CMMA arch/s390/kvm/s390/intercept.c | 23 ++++++++++------------- arch/s390/kvm/s390/interrupt.c | 8 ++++---- arch/s390/kvm/s390/priv.c | 19 ++++++++++--------- arch/s390/kvm/s390/s390.c | 12 ++++++------ 4 files changed, 30 insertions(+), 32 deletions(-) --- base-commit: cee9395acd8043be0644b25c34bfa86623f2b935 change-id: 20260828-s390-kvm-2015b0d777dc -- Sincerely yours, Mike.