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Thu, 16 Oct 2025 17:33:06 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 16 Oct 2025 17:32:28 -0700 In-Reply-To: <20251017003244.186495-1-seanjc@google.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list Mime-Version: 1.0 References: <20251017003244.186495-1-seanjc@google.com> X-Mailer: git-send-email 2.51.0.858.gf9c4a03a3a-goog Message-ID: <20251017003244.186495-11-seanjc@google.com> Subject: [PATCH v3 10/25] KVM: x86/mmu: Drop the return code from kvm_x86_ops.remove_external_spte() From: Sean Christopherson To: Marc Zyngier , Oliver Upton , Tianrui Zhao , Bibo Mao , Huacai Chen , Madhavan Srinivasan , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Sean Christopherson , Paolo Bonzini , "Kirill A. Shutemov" Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, x86@kernel.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, Ira Weiny , Kai Huang , Michael Roth , Yan Zhao , Vishal Annapurve , Rick Edgecombe , Ackerley Tng , Binbin Wu Content-Type: text/plain; charset="UTF-8" Drop the return code from kvm_x86_ops.remove_external_spte(), a.k.a. tdx_sept_remove_private_spte(), as KVM simply does a KVM_BUG_ON() failure, and that KVM_BUG_ON() is redundant since all error paths in TDX also do a KVM_BUG_ON(). Opportunistically pass the spte instead of the pfn, as the API is clearly about removing an spte. Suggested-by: Rick Edgecombe Reviewed-by: Binbin Wu Signed-off-by: Sean Christopherson --- arch/x86/include/asm/kvm_host.h | 4 ++-- arch/x86/kvm/mmu/tdp_mmu.c | 8 ++------ arch/x86/kvm/vmx/tdx.c | 17 ++++++++--------- 3 files changed, 12 insertions(+), 17 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 48598d017d6f..7e92aebd07e8 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1855,8 +1855,8 @@ struct kvm_x86_ops { void *external_spt); /* Update external page table from spte getting removed, and flush TLB. */ - int (*remove_external_spte)(struct kvm *kvm, gfn_t gfn, enum pg_level level, - kvm_pfn_t pfn_for_gfn); + void (*remove_external_spte)(struct kvm *kvm, gfn_t gfn, enum pg_level level, + u64 spte); bool (*has_wbinvd_exit)(void); diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index 9b4006c2120e..c09c25f3f93b 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -362,9 +362,6 @@ static void tdp_mmu_unlink_sp(struct kvm *kvm, struct kvm_mmu_page *sp) static void remove_external_spte(struct kvm *kvm, gfn_t gfn, u64 old_spte, int level) { - kvm_pfn_t old_pfn = spte_to_pfn(old_spte); - int ret; - /* * External (TDX) SPTEs are limited to PG_LEVEL_4K, and external * PTs are removed in a special order, involving free_external_spt(). @@ -377,9 +374,8 @@ static void remove_external_spte(struct kvm *kvm, gfn_t gfn, u64 old_spte, /* Zapping leaf spte is allowed only when write lock is held. */ lockdep_assert_held_write(&kvm->mmu_lock); - /* Because write lock is held, operation should success. */ - ret = kvm_x86_call(remove_external_spte)(kvm, gfn, level, old_pfn); - KVM_BUG_ON(ret, kvm); + + kvm_x86_call(remove_external_spte)(kvm, gfn, level, old_spte); } /** diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index abea9b3d08cf..f5cbcbf4e663 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -1806,12 +1806,12 @@ static int tdx_sept_free_private_spt(struct kvm *kvm, gfn_t gfn, return tdx_reclaim_page(virt_to_page(private_spt)); } -static int tdx_sept_remove_private_spte(struct kvm *kvm, gfn_t gfn, - enum pg_level level, kvm_pfn_t pfn) +static void tdx_sept_remove_private_spte(struct kvm *kvm, gfn_t gfn, + enum pg_level level, u64 spte) { + struct page *page = pfn_to_page(spte_to_pfn(spte)); int tdx_level = pg_level_to_tdx_sept_level(level); struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm); - struct page *page = pfn_to_page(pfn); gpa_t gpa = gfn_to_gpa(gfn); u64 err, entry, level_state; int ret; @@ -1822,15 +1822,15 @@ static int tdx_sept_remove_private_spte(struct kvm *kvm, gfn_t gfn, * there can't be anything populated in the private EPT. */ if (KVM_BUG_ON(!is_hkid_assigned(to_kvm_tdx(kvm)), kvm)) - return -EIO; + return; /* TODO: handle large pages. */ if (KVM_BUG_ON(level != PG_LEVEL_4K, kvm)) - return -EIO; + return; ret = tdx_sept_zap_private_spte(kvm, gfn, level, page); if (ret <= 0) - return ret; + return; /* * TDX requires TLB tracking before dropping private page. Do @@ -1859,17 +1859,16 @@ static int tdx_sept_remove_private_spte(struct kvm *kvm, gfn_t gfn, if (KVM_BUG_ON(err, kvm)) { pr_tdx_error_2(TDH_MEM_PAGE_REMOVE, err, entry, level_state); - return -EIO; + return; } err = tdh_phymem_page_wbinvd_hkid((u16)kvm_tdx->hkid, page); if (KVM_BUG_ON(err, kvm)) { pr_tdx_error(TDH_PHYMEM_PAGE_WBINVD, err); - return -EIO; + return; } tdx_quirk_reset_page(page); - return 0; } void tdx_deliver_interrupt(struct kvm_lapic *apic, int delivery_mode, -- 2.51.0.858.gf9c4a03a3a-goog