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Thu, 10 Oct 2024 11:27:33 -0700 (PDT) Date: Thu, 10 Oct 2024 11:24:18 -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: <20241010182427.1434605-77-seanjc@google.com> Subject: [PATCH v13 76/85] KVM: Add support for read-only usage of gfn_to_page() 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_112735_109685_FE26BD8C X-CRM114-Status: GOOD ( 14.01 ) 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 UmV3b3JrIGdmbl90b19wYWdlKCkgdG8gc3VwcG9ydCByZWFkLW9ubHkgYWNjZXNzZXMgc28gdGhh dCBpdCBjYW4gYmUgdXNlZApieSBhcm02NCB0byBnZXQgTVRFIHRhZ3Mgb3V0IG9mIGd1ZXN0IG1l bW9yeS4KCk9wcG9ydHVuaXN0aWNhbGx5IHJld3JpdGUgdGhlIGNvbW1lbnQgdG8gYmUgZXZlbiBt b3JlIHN0ZXJuIGFib3V0IHVzaW5nCmdmbl90b19wYWdlKCksIGFzIHRoZXJlIGFyZSB2ZXJ5IGZl dyBzY2VuYXJpb3Mgd2hlcmUgcmVxdWlyaW5nIGEgc3RydWN0CnBhZ2UgaXMgYWN0dWFsbHkgdGhl IHJpZ2h0IHRoaW5nIHRvIGRvICh0aG91Z2ggdGhlcmUgYXJlIHN1Y2ggc2NlbmFyaW9zKS4KQWRk IGEgRklYTUUgdG8gY2FsbCBvdXQgdGhhdCBLVk0gcHJvYmFibHkgc2hvdWxkIGJlIHBpbm5pbmcg cGFnZXMsIG5vdApqdXN0IGdldHRpbmcgcGFnZXMuCgpUZXN0ZWQtYnk6IEFsZXggQmVubsOpZSA8 YWxleC5iZW5uZWVAbGluYXJvLm9yZz4KU2lnbmVkLW9mZi1ieTogU2VhbiBDaHJpc3RvcGhlcnNv biA8c2VhbmpjQGdvb2dsZS5jb20+Ci0tLQogaW5jbHVkZS9saW51eC9rdm1faG9zdC5oIHwgIDcg KysrKysrLQogdmlydC9rdm0va3ZtX21haW4uYyAgICAgIHwgMTUgKysrKysrKystLS0tLS0tCiAy IGZpbGVzIGNoYW5nZWQsIDE0IGluc2VydGlvbnMoKyksIDggZGVsZXRpb25zKC0pCgpkaWZmIC0t Z2l0IGEvaW5jbHVkZS9saW51eC9rdm1faG9zdC5oIGIvaW5jbHVkZS9saW51eC9rdm1faG9zdC5o CmluZGV4IDlmNzY4MmVjZTRhMS4uYWY5MjhiNTliMmFiIDEwMDY0NAotLS0gYS9pbmNsdWRlL2xp bnV4L2t2bV9ob3N0LmgKKysrIGIvaW5jbHVkZS9saW51eC9rdm1faG9zdC5oCkBAIC0xMjEzLDcg KzEyMTMsMTIgQEAgdm9pZCBrdm1fYXJjaF9mbHVzaF9zaGFkb3dfbWVtc2xvdChzdHJ1Y3Qga3Zt ICprdm0sCiBpbnQga3ZtX3ByZWZldGNoX3BhZ2VzKHN0cnVjdCBrdm1fbWVtb3J5X3Nsb3QgKnNs b3QsIGdmbl90IGdmbiwKIAkJICAgICAgIHN0cnVjdCBwYWdlICoqcGFnZXMsIGludCBucl9wYWdl cyk7CiAKLXN0cnVjdCBwYWdlICpnZm5fdG9fcGFnZShzdHJ1Y3Qga3ZtICprdm0sIGdmbl90IGdm bik7CitzdHJ1Y3QgcGFnZSAqX19nZm5fdG9fcGFnZShzdHJ1Y3Qga3ZtICprdm0sIGdmbl90IGdm biwgYm9vbCB3cml0ZSk7CitzdGF0aWMgaW5saW5lIHN0cnVjdCBwYWdlICpnZm5fdG9fcGFnZShz dHJ1Y3Qga3ZtICprdm0sIGdmbl90IGdmbikKK3sKKwlyZXR1cm4gX19nZm5fdG9fcGFnZShrdm0s IGdmbiwgdHJ1ZSk7Cit9CisKIHVuc2lnbmVkIGxvbmcgZ2ZuX3RvX2h2YShzdHJ1Y3Qga3ZtICpr dm0sIGdmbl90IGdmbik7CiB1bnNpZ25lZCBsb25nIGdmbl90b19odmFfcHJvdChzdHJ1Y3Qga3Zt ICprdm0sIGdmbl90IGdmbiwgYm9vbCAqd3JpdGFibGUpOwogdW5zaWduZWQgbG9uZyBnZm5fdG9f aHZhX21lbXNsb3Qoc3RydWN0IGt2bV9tZW1vcnlfc2xvdCAqc2xvdCwgZ2ZuX3QgZ2ZuKTsKZGlm ZiAtLWdpdCBhL3ZpcnQva3ZtL2t2bV9tYWluLmMgYi92aXJ0L2t2bS9rdm1fbWFpbi5jCmluZGV4 IDE3ODIyNDJhNDgwMC4uOGY4YjJjZDAxMTg5IDEwMDY0NAotLS0gYS92aXJ0L2t2bS9rdm1fbWFp bi5jCisrKyBiL3ZpcnQva3ZtL2t2bV9tYWluLmMKQEAgLTMxMzgsMjUgKzMxMzgsMjYgQEAgaW50 IGt2bV9wcmVmZXRjaF9wYWdlcyhzdHJ1Y3Qga3ZtX21lbW9yeV9zbG90ICpzbG90LCBnZm5fdCBn Zm4sCiBFWFBPUlRfU1lNQk9MX0dQTChrdm1fcHJlZmV0Y2hfcGFnZXMpOwogCiAvKgotICogRG8g bm90IHVzZSB0aGlzIGhlbHBlciB1bmxlc3MgeW91IGFyZSBhYnNvbHV0ZWx5IGNlcnRhaW4gdGhl IGdmbiBfbXVzdF8gYmUKLSAqIGJhY2tlZCBieSAnc3RydWN0IHBhZ2UnLiAgQSB2YWxpZCBleGFt cGxlIGlzIGlmIHRoZSBiYWNraW5nIG1lbXNsb3QgaXMKLSAqIGNvbnRyb2xsZWQgYnkgS1ZNLiAg Tm90ZSwgaWYgdGhlIHJldHVybmVkIHBhZ2UgaXMgdmFsaWQsIGl0J3MgcmVmY291bnQgaGFzCi0g KiBiZWVuIGVsZXZhdGVkIGJ5IGdmbl90b19wZm4oKS4KKyAqIERvbid0IHVzZSB0aGlzIEFQSSB1 bmxlc3MgeW91IGFyZSBhYnNvbHV0ZWx5LCBwb3NpdGl2ZWx5IGNlcnRhaW4gdGhhdCBLVk0KKyAq IG5lZWRzIHRvIGdldCBhIHN0cnVjdCBwYWdlLCBlLmcuIHRvIHBpbiB0aGUgcGFnZSBmb3IgZmly bXdhcmUgRE1BLgorICoKKyAqIEZJWE1FOiBVc2VycyBvZiB0aGlzIEFQSSBsaWtlbHkgbmVlZCB0 byBGT0xMX1BJTiB0aGUgcGFnZSwgbm90IGp1c3QgZWxldmF0ZQorICoJICBpdHMgcmVmY291bnQu CiAgKi8KLXN0cnVjdCBwYWdlICpnZm5fdG9fcGFnZShzdHJ1Y3Qga3ZtICprdm0sIGdmbl90IGdm bikKK3N0cnVjdCBwYWdlICpfX2dmbl90b19wYWdlKHN0cnVjdCBrdm0gKmt2bSwgZ2ZuX3QgZ2Zu LCBib29sIHdyaXRlKQogewogCXN0cnVjdCBwYWdlICpyZWZjb3VudGVkX3BhZ2UgPSBOVUxMOwog CXN0cnVjdCBrdm1fZm9sbG93X3BmbiBrZnAgPSB7CiAJCS5zbG90ID0gZ2ZuX3RvX21lbXNsb3Qo a3ZtLCBnZm4pLAogCQkuZ2ZuID0gZ2ZuLAotCQkuZmxhZ3MgPSBGT0xMX1dSSVRFLAorCQkuZmxh Z3MgPSB3cml0ZSA/IEZPTExfV1JJVEUgOiAwLAogCQkucmVmY291bnRlZF9wYWdlID0gJnJlZmNv dW50ZWRfcGFnZSwKIAl9OwogCiAJKHZvaWQpa3ZtX2ZvbGxvd19wZm4oJmtmcCk7CiAJcmV0dXJu IHJlZmNvdW50ZWRfcGFnZTsKIH0KLUVYUE9SVF9TWU1CT0xfR1BMKGdmbl90b19wYWdlKTsKK0VY UE9SVF9TWU1CT0xfR1BMKF9fZ2ZuX3RvX3BhZ2UpOwogCiBpbnQgX19rdm1fdmNwdV9tYXAoc3Ry dWN0IGt2bV92Y3B1ICp2Y3B1LCBnZm5fdCBnZm4sIHN0cnVjdCBrdm1faG9zdF9tYXAgKm1hcCwK IAkJICAgYm9vbCB3cml0YWJsZSkKLS0gCjIuNDcuMC5yYzEuMjg4LmcwNjI5OGQxNTI1LWdvb2cK CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1y aXNjdiBtYWlsaW5nIGxpc3QKbGludXgtcmlzY3ZAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8v bGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LXJpc2N2Cg==