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Thu, 10 Oct 2024 11:27:01 -0700 (PDT) Date: Thu, 10 Oct 2024 11:24:03 -0700 In-Reply-To: <20241010182427.1434605-1-seanjc@google.com> Mime-Version: 1.0 References: <20241010182427.1434605-1-seanjc@google.com> X-Mailer: git-send-email 2.47.0.rc1.288.g06298d1525-goog Message-ID: <20241010182427.1434605-62-seanjc@google.com> Subject: [PATCH v13 61/85] KVM: PPC: Use __kvm_faultin_pfn() to handle page faults on Book3s Radix From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Tianrui Zhao , Bibo Mao , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Sean Christopherson Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, "=?UTF-8?q?Alex=20Benn=C3=A9e?=" , Yan Zhao , David Matlack , David Stevens , Andrew Jones X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241010_112703_564754_90B32420 X-CRM114-Status: GOOD ( 12.96 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Replace Book3s Radix's homebrewed (read: copy+pasted) fault-in logic with __kvm_faultin_pfn(), which functionally does pretty much the exact same thing. Note, when the code was written, KVM indeed didn't do fast GUP without "!atomic && !async", but that has long since changed (KVM tries fast GUP for all writable mappings). Signed-off-by: Sean Christopherson --- arch/powerpc/kvm/book3s_64_mmu_radix.c | 29 +++++--------------------- 1 file changed, 5 insertions(+), 24 deletions(-) diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c index 8304b6f8fe45..14891d0a3b73 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -829,40 +829,21 @@ int kvmppc_book3s_instantiate_page(struct kvm_vcpu *vcpu, unsigned long mmu_seq; unsigned long hva, gfn = gpa >> PAGE_SHIFT; bool upgrade_write = false; - bool *upgrade_p = &upgrade_write; pte_t pte, *ptep; unsigned int shift, level; int ret; bool large_enable; + kvm_pfn_t pfn; /* used to check for invalidations in progress */ mmu_seq = kvm->mmu_invalidate_seq; smp_rmb(); - /* - * Do a fast check first, since __gfn_to_pfn_memslot doesn't - * do it with !atomic && !async, which is how we call it. - * We always ask for write permission since the common case - * is that the page is writable. - */ hva = gfn_to_hva_memslot(memslot, gfn); - if (!kvm_ro && get_user_page_fast_only(hva, FOLL_WRITE, &page)) { - upgrade_write = true; - } else { - unsigned long pfn; - - /* Call KVM generic code to do the slow-path check */ - pfn = __gfn_to_pfn_memslot(memslot, gfn, false, NULL, - writing, upgrade_p); - if (is_error_noslot_pfn(pfn)) - return -EFAULT; - page = NULL; - if (pfn_valid(pfn)) { - page = pfn_to_page(pfn); - if (PageReserved(page)) - page = NULL; - } - } + pfn = __kvm_faultin_pfn(memslot, gfn, writing ? FOLL_WRITE : 0, + &upgrade_write, &page); + if (is_error_noslot_pfn(pfn)) + return -EFAULT; /* * Read the PTE from the process' radix tree and use that -- 2.47.0.rc1.288.g06298d1525-goog _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv