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Peter Anvin" , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonas Bonn , Stefan Kristiansson , Stafford Horne Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-openrisc@vger.kernel.org, Yeoreum Yun X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3753; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=uF4DfWzXa9EkGf1I0Bn2aL3RfBnTbP81TBjbavbJ8QQ=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqsQ1QAg31Sog0FCjc3kuChuSeE5nwlfWLMD4sT IBC+fegfX2JAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCarENUAAKCRBt1cPRWsUx Mx8TDACfGiY1tFbMNuqJzhqG74lnH8gGDp7+4K0KfmvivFAxuHooIWaalWIlCiXzXZGwXVbHHwy EPxRgkJ1uw1jlH3gDOGxNETf15cT+KdPWxc2IPcZjimn44GpN/tHq3ie/ILysREci576iJCfLl4 hZhn/31gf80m5wAoruCFpkdOoDK9vI2gDH1iAE7dcktlPtXovnfLAUzOVfzwDk1sJuYI3BsByOn l1dM0H6rX2RhzKIfJT02RA3stLjqjS4aqMUOuIEyQ7uCm/vePyl/toLHSfNlXeAFt+vkDA1BaNk G2Mqub8YtbPcYMJILsZALUoZGulrUViemuEn1MQuFSk3xeW6LvdIps5z0pgD/hyMDOQMsf9zlaq 43upc2P7Di2WqF1BalL1zetYzreAC4iO8Ass4iBh3zl5KSk4v4cizRvztC13VZGm8bZN2nr/A/H LW9L0Tf5m0dkB2RXOoknui/VOBmrN6PvMrEVqP3go7fwbJPESPNAgPLiosUQHnJ16thBo= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 9AA961A0003 X-Rspam-User: X-Stat-Signature: ezab56p464xp5qbast3tsybunua648fg X-HE-Tag: 1789988272-443498 X-HE-Meta: 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 fQnWy+Mn 0/R1S0HhhyZxD4zebtoYfvBSMl7Oivabl/+tVzgnUjhQNxXyPJ/ALHL7vBftGl8xvK2rUzcv8zqqgnq13+dlztEtS2LHSzHsj5JZT1Rr5F/dD7G2flSmxcaa558KdfjDGuK0Z2f6XPjkZ0/bKEraxAc31iFmLeygqL3+1vaZ0m8oxAPu3orDC+wKNMoqTyxF+Xi+0qUXmSE47A8jDDJSdtVUJgAqEgaRKCRq8ojJgEFKnHcJqJbMnu4oA2+yeD06AXPtX4S7FAUjWWS29APNrMjdgw/D1yd6Iix5QUp9QZ1CRjls= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The behaviour of pXdp_get() will change with generic compile-time folded page tables, making it invalid to use set_pXd() with the result of pXdp_get(). Instead, the appropriate first-level set_pXd() must be paired with the corresponding pXdp_get(). Therefore, call the appropriate set_pXd() for generic compile-time folded page tables so that vmalloc_fault() continues to handle folded entries correctly when checking pXd_present(). There should be no functional change. Since most architectures use a similar pattern to handle vmalloc fault by syncing the faulted entry, it would be worth cleaning this up by introducing a common helper in the near future. Signed-off-by: Yeoreum Yun --- arch/riscv/mm/fault.c | 52 ++++++++++++++++++++++++++++++++------------------- 1 file changed, 33 insertions(+), 19 deletions(-) diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index 04ed6f8acae4f..b2bcaf10d13f1 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -167,14 +167,16 @@ bad_area(struct pt_regs *regs, struct mm_struct *mm, int code, static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long addr) { - pgd_t *pgd, *pgd_k; - pud_t *pud_k; - p4d_t *p4d_k; - pmd_t *pmd_k; - pte_t *pte_k; + pgd_t *pgdp_k, *pgdp, pgd_k; + p4d_t *p4dp_k, *p4dp; + pud_t *pudp_k, *pudp, pud_k; + pmd_t *pmdp_k, *pmdp, pmd_k; + pte_t *ptep_k; int index; unsigned long pfn; + BUILD_BUG_ON(CONFIG_PGTABLE_LEVELS != 5 && CONFIG_PGTABLE_LEVELS != 2); + /* User mode accesses just cause a SIGSEGV */ if (user_mode(regs)) return do_trap(regs, SIGSEGV, code, addr); @@ -189,39 +191,51 @@ static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long a */ index = pgd_index(addr); pfn = csr_read(CSR_SATP) & SATP_PPN; - pgd = (pgd_t *)pfn_to_virt(pfn) + index; - pgd_k = init_mm.pgd + index; - if (!pgd_present(pgdp_get(pgd_k))) { + pgdp = (pgd_t *)pfn_to_virt(pfn) + index; + pgdp_k = init_mm.pgd + index; + + pgd_k = pgdp_get(pgdp_k); + if (!pgd_present(pgd_k)) { no_context(regs, addr); return; } - set_pgd(pgd, pgdp_get(pgd_k)); + if (CONFIG_PGTABLE_LEVELS == 5) + set_pgd(pgdp, pgd_k); - p4d_k = p4d_offset(pgd_k, addr); - if (!p4d_present(p4dp_get(p4d_k))) { + p4dp = p4d_offset(pgdp, addr); + p4dp_k = p4d_offset(pgdp_k, addr); + if (!p4d_present(p4dp_get(p4dp_k))) { no_context(regs, addr); return; } - pud_k = pud_offset(p4d_k, addr); - if (!pud_present(pudp_get(pud_k))) { + pudp = pud_offset(p4dp, addr); + pudp_k = pud_offset(p4dp_k, addr); + + pud_k = pudp_get(pudp_k); + if (!pud_present(pud_k)) { no_context(regs, addr); return; } - if (pud_leaf(pudp_get(pud_k))) + if (pud_leaf(pud_k)) goto flush_tlb; /* * Since the vmalloc area is global, it is unnecessary * to copy individual PTEs */ - pmd_k = pmd_offset(pud_k, addr); - if (!pmd_present(pmdp_get(pmd_k))) { + pmdp = pmd_offset(pudp, addr); + pmdp_k = pmd_offset(pudp_k, addr); + + pmd_k = pmdp_get(pmdp_k); + if (!pmd_present(pmd_k)) { no_context(regs, addr); return; } - if (pmd_leaf(pmdp_get(pmd_k))) + if (CONFIG_PGTABLE_LEVELS == 2) + set_pmd(pmdp, pmd_k); + if (pmd_leaf(pmd_k)) goto flush_tlb; /* @@ -230,8 +244,8 @@ static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long a * addresses. If we don't do this, this will just * silently loop forever. */ - pte_k = pte_offset_kernel(pmd_k, addr); - if (!pte_present(ptep_get(pte_k))) { + ptep_k = pte_offset_kernel(pmdp_k, addr); + if (!pte_present(ptep_get(ptep_k))) { no_context(regs, addr); return; } -- 2.43.0