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Tue, 05 May 2026 12:52:49 -0700 (PDT) Received: from [192.168.10.48] ([176.206.106.181]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48a82301b7bsm496832835e9.11.2026.05.05.12.52.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 May 2026 12:52:47 -0700 (PDT) From: Paolo Bonzini To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: d.riley@proxmox.com, jon@nutanix.com Subject: [PATCH 08/28] KVM: x86/mmu: separate more EPT/non-EPT permission_fault() Date: Tue, 5 May 2026 21:52:06 +0200 Message-ID: <20260505195226.563317-9-pbonzini@redhat.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260505195226.563317-1-pbonzini@redhat.com> References: <20260505195226.563317-1-pbonzini@redhat.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Move more of EPT handling entirely in the existing "if (!ept)" conditional. Use a new "rf" variable instead of uf for read permissions for clarity. Merge smepf and ff into a single variable because EPT's "SMEP" (actually MBEC) is defined differently and does not need smepf. Tested-by: David Riley Signed-off-by: Paolo Bonzini --- arch/x86/kvm/mmu/mmu.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index d94a488db79d..fc34536c536b 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -5584,24 +5584,28 @@ static void update_permission_bitmask(struct kvm_mmu *mmu, bool ept) * that causes a fault with the given PFEC. */ + /* Faults from reads to non-readable pages */ + u8 rf = 0; /* Faults from writes to non-writable pages */ u8 wf = (pfec & PFERR_WRITE_MASK) ? (u8)~w : 0; /* Faults from user mode accesses to supervisor pages */ - u8 uf = (pfec & PFERR_USER_MASK) ? (u8)~u : 0; - /* Faults from fetches of non-executable pages*/ - u8 ff = (pfec & PFERR_FETCH_MASK) ? (u8)~x : 0; - /* Faults from kernel mode fetches of user pages */ - u8 smepf = 0; + u8 uf = 0; + /* Faults from fetches of non-executable pages */ + u8 ff = 0; /* Faults from kernel mode accesses of user pages */ u8 smapf = 0; - if (!ept) { + if (ept) { + rf = (pfec & PFERR_USER_MASK) ? (u8)~u : 0; + ff = (pfec & PFERR_FETCH_MASK) ? (u8)~x : 0; + } else { /* Faults from kernel mode accesses to user pages */ u8 kf = (pfec & PFERR_USER_MASK) ? 0 : u; - /* Not really needed: !nx will cause pte.nx to fault */ - if (!efer_nx) - ff = 0; + uf = (pfec & PFERR_USER_MASK) ? (u8)~u : 0; + + if (efer_nx) + ff = (pfec & PFERR_FETCH_MASK) ? (u8)~x : 0; /* Allow supervisor writes if !cr0.wp */ if (!cr0_wp) @@ -5609,7 +5613,7 @@ static void update_permission_bitmask(struct kvm_mmu *mmu, bool ept) /* Disallow supervisor fetches of user code if cr4.smep */ if (cr4_smep) - smepf = (pfec & PFERR_FETCH_MASK) ? kf : 0; + ff |= (pfec & PFERR_FETCH_MASK) ? kf : 0; /* * SMAP:kernel-mode data accesses from user-mode @@ -5630,7 +5634,7 @@ static void update_permission_bitmask(struct kvm_mmu *mmu, bool ept) smapf = (pfec & (PFERR_RSVD_MASK|PFERR_FETCH_MASK)) ? 0 : kf; } - mmu->permissions[index] = ff | uf | wf | smepf | smapf; + mmu->permissions[index] = ff | uf | wf | rf | smapf; } } -- 2.54.0