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Thu, 10 Oct 2024 11:26:04 -0700 (PDT) Date: Thu, 10 Oct 2024 11:23:37 -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: <20241010182427.1434605-36-seanjc@google.com> Subject: [PATCH v13 35/85] KVM: Disallow direct access (w/o mmu_notifier) to unpinned pfn by default 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_112606_373308_FF01BC20 X-CRM114-Status: GOOD ( 14.98 ) 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="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org QWRkIGFuIG9mZi1ieS1kZWZhdWx0IG1vZHVsZSBwYXJhbSB0byBjb250cm9sIHdoZXRoZXIgb3Ig bm90IEtWTSBpcyBhbGxvd2VkCnRvIG1hcCBtZW1vcnkgdGhhdCBpc24ndCBwaW5uZWQsIGkuZS4g dGhhdCBLVk0gY2FuJ3QgZ3VhcmFudGVlIHdvbid0IGJlCmZyZWVkIHdoaWxlIGl0IGlzIG1hcHBl ZCBpbnRvIEtWTSBhbmQvb3IgdGhlIGd1ZXN0LiAgRG9uJ3QgcmVtb3ZlIHRoZQpmdW5jdGlvbmFs aXR5IGVudGlyZWx5LCBhcyB0aGVyZSBhcmUgdXNlIGNhc2VzIHdoZXJlIG1hcHBpbmcgdW5waW5u ZWQKbWVtb3J5IGlzIHNhZmUgKGFzIGRlZmluZWQgYnkgdGhlIHBsYXRmb3JtIG93bmVyKSwgZS5n LiB3aGVuIG1lbW9yeSBpcwpoaWRkZW4gZnJvbSB0aGUga2VybmVsIGFuZCBtYW5hZ2VkIGJ5IHVz ZXJzcGFjZSwgaW4gd2hpY2ggY2FzZSB1c2Vyc3BhY2UKaXMgYWxyZWFkeSBmdWxseSB0cnVzdGVk IHRvIG5vdCBtdWNrIHdpdGggZ3Vlc3QgbWVtb3J5IG1hcHBpbmdzLgoKQnV0IGZvciBtb3JlIHR5 cGljYWwgc2V0dXBzLCBtYXBwaW5nIHVucGlubmVkIG1lbW9yeSBpcyB3aWxkbHkgdW5zYWZlLCBh bmQKdW5uZWNlc3NhcnkuICBUaGUgQVBJcyBhcmUgdXNlZCBleGNsdXNpdmVseSBieSB4ODYncyBu ZXN0ZWQgdmlydHVhbGl6YXRpb24Kc3VwcG9ydCwgYW5kIHRoZXJlIGlzIG5vIGtub3duIChvciBz YW5lKSB1c2UgY2FzZSBmb3IgbWFwcGluZyBQRk4tbWFwcGVkCm1lbW9yeSBhIEtWTSBndWVzdCBf YW5kXyBsZXR0aW5nIHRoZSBndWVzdCB1c2UgaXQgZm9yIHZpcnR1YWxpemF0aW9uCnN0cnVjdHVy ZXMuCgpUZXN0ZWQtYnk6IEFsZXggQmVubsOpZSA8YWxleC5iZW5uZWVAbGluYXJvLm9yZz4KU2ln bmVkLW9mZi1ieTogU2VhbiBDaHJpc3RvcGhlcnNvbiA8c2VhbmpjQGdvb2dsZS5jb20+Ci0tLQog dmlydC9rdm0va3ZtX21haW4uYyB8IDE4ICsrKysrKysrKysrKysrKysrKwogMSBmaWxlIGNoYW5n ZWQsIDE4IGluc2VydGlvbnMoKykKCmRpZmYgLS1naXQgYS92aXJ0L2t2bS9rdm1fbWFpbi5jIGIv dmlydC9rdm0va3ZtX21haW4uYwppbmRleCBiODQ1ZTkyNTI2MzMuLjZkY2I0ZjBlZWQzZSAxMDA2 NDQKLS0tIGEvdmlydC9rdm0va3ZtX21haW4uYworKysgYi92aXJ0L2t2bS9rdm1fbWFpbi5jCkBA IC05NCw2ICs5NCwxMyBAQCB1bnNpZ25lZCBpbnQgaGFsdF9wb2xsX25zX3NocmluayA9IDI7CiBt b2R1bGVfcGFyYW0oaGFsdF9wb2xsX25zX3NocmluaywgdWludCwgMDY0NCk7CiBFWFBPUlRfU1lN Qk9MX0dQTChoYWx0X3BvbGxfbnNfc2hyaW5rKTsKIAorLyoKKyAqIEFsbG93IGRpcmVjdCBhY2Nl c3MgKGZyb20gS1ZNIG9yIHRoZSBDUFUpIHdpdGhvdXQgTU1VIG5vdGlmaWVyIHByb3RlY3Rpb24K KyAqIHRvIHVucGlubmVkIHBhZ2VzLgorICovCitzdGF0aWMgYm9vbCBhbGxvd191bnNhZmVfbWFw cGluZ3M7Cittb2R1bGVfcGFyYW0oYWxsb3dfdW5zYWZlX21hcHBpbmdzLCBib29sLCAwNDQ0KTsK KwogLyoKICAqIE9yZGVyaW5nIG9mIGxvY2tzOgogICoKQEAgLTI4MTEsNiArMjgxOCw5IEBAIHN0 YXRpYyBrdm1fcGZuX3Qga3ZtX3Jlc29sdmVfcGZuKHN0cnVjdCBrdm1fZm9sbG93X3BmbiAqa2Zw LCBzdHJ1Y3QgcGFnZSAqcGFnZSwKIAkgKiByZWZlcmVuY2UgdG8gc3VjaCBwYWdlcyB3b3VsZCBj YXVzZSBLVk0gdG8gcHJlbWF0dXJlbHkgZnJlZSBhIHBhZ2UKIAkgKiBpdCBkb2Vzbid0IG93biAo S1ZNIGdldHMgYW5kIHB1dHMgdGhlIG9uZSBhbmQgb25seSByZWZlcmVuY2UpLgogCSAqIERvbid0 IGFsbG93IHRob3NlIHBhZ2VzIHVudGlsIHRoZSBGSVhNRSBpcyByZXNvbHZlZC4KKwkgKgorCSAq IERvbid0IGdyYWIgYSByZWZlcmVuY2UgZm9yIHBpbnMsIGNhbGxlcnMgdGhhdCBwaW4gcGFnZXMg YXJlIHJlcXVpcmVkCisJICogdG8gY2hlY2sgcmVmY291bnRlZF9wYWdlLCBpLmUuIG11c3Qgbm90 IGJsaW5kbHkgcmVsZWFzZSB0aGUgcGZuLgogCSAqLwogCWlmIChtYXApIHsKIAkJcGZuID0gbWFw LT5wZm47CkBAIC0yOTI5LDYgKzI5MzksMTQgQEAgc3RhdGljIGludCBodmFfdG9fcGZuX3JlbWFw cGVkKHN0cnVjdCB2bV9hcmVhX3N0cnVjdCAqdm1hLAogCWJvb2wgd3JpdGVfZmF1bHQgPSBrZnAt PmZsYWdzICYgRk9MTF9XUklURTsKIAlpbnQgcjsKIAorCS8qCisJICogUmVtYXBwZWQgbWVtb3J5 IGNhbm5vdCBiZSBwaW5uZWQgaW4gYW55IG1lYW5pbmdmdWwgc2Vuc2UuICBCYWlsIGlmCisJICog dGhlIGNhbGxlciB3YW50cyB0byBwaW4gdGhlIHBhZ2UsIGkuZS4gYWNjZXNzIHRoZSBwYWdlIG91 dHNpZGUgb2YKKwkgKiBNTVUgbm90aWZpZXIgcHJvdGVjdGlvbiwgYW5kIHVuc2FmZSB1bWFwcGlu Z3MgYXJlIGRpc2FsbG93ZWQuCisJICovCisJaWYgKGtmcC0+cGluICYmICFhbGxvd191bnNhZmVf bWFwcGluZ3MpCisJCXJldHVybiAtRUlOVkFMOworCiAJciA9IGZvbGxvd19wZm5tYXBfc3RhcnQo JmFyZ3MpOwogCWlmIChyKSB7CiAJCS8qCi0tIAoyLjQ3LjAucmMxLjI4OC5nMDYyOThkMTUyNS1n b29nCgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGlu dXgtcmlzY3YgbWFpbGluZyBsaXN0CmxpbnV4LXJpc2N2QGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0 cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1yaXNjdgo=