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Mon, 24 Sep 2018 14:50:24 +0000 Received: from CY4PR21MB0776.namprd21.prod.outlook.com ([fe80::54e2:88e0:b622:b36]) by CY4PR21MB0776.namprd21.prod.outlook.com ([fe80::54e2:88e0:b622:b36%5]) with mapi id 15.20.1207.003; Mon, 24 Sep 2018 14:50:24 +0000 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Paul Mackerras , Sasha Levin Subject: [PATCH AUTOSEL 4.9 02/23] KVM: PPC: Book3S HV: Don't truncate HPTE index in xlate function Thread-Topic: [PATCH AUTOSEL 4.9 02/23] KVM: PPC: Book3S HV: Don't truncate HPTE index in xlate function Thread-Index: AQHUVBXIjvcMFmHOtUK/zri8oVSQVA== Date: Mon, 24 Sep 2018 14:49:24 +0000 Message-ID: <20180924144919.164617-2-alexander.levin@microsoft.com> References: <20180924144919.164617-1-alexander.levin@microsoft.com> In-Reply-To: <20180924144919.164617-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;CY4PR21MB0181;6:iNhAYeJdhIMEqe9GkdQEnEP+w6UlnmzlyIFvOEpIgGx4CcagDNq59EhNs3mYHXH84SsRqw5qzc5SZYDDuZaYcpN6ENih+GClYBQxiXp21SXFqt5MlQhnFSZ9VDVNyyD0PzS8grhhI+oAJ872DaSzxCWKh4C1Wa7OlY83bdWiwIq8/MfhCPK5rh6vLNTS+YjDx8sKzCcDjvUQCSsFh+R0fgv6F4YPRCDr/2u2r899EIK28qS6sngip0RZenrAPYm1vy63XP31fR99EcBwGl7WXAvG8I+QESdwpP4ZvkoQBVglW89rl8U5d8tm5X9atwOtnT5j4rn8Pt4idruCGiNdkN62wvnsUlv74HYm3PV60Ox5039PS6VgZ1yDY8dmgjIqtu2iMR2WYT42bgbSzPr2bYXZDVDUAR1RIhRArDofJ2y7mQGYSyUr5HjmbHnwJZNv/6Ca7CllEPL767OJUle9Dg==;5:QzWLW/pA9AmmxDLu3nVyaivDxZi3tAo/hbOYjWXQi+DOHVUuY/yHrviuAniAknD8pE8wOST4LvcSqW4XZn2FUCjaKif7CFWPrHWg6dHcHbeaiCEmyH0fjbrh7N/LBzSEZFVVRI5T6tUgittx8+VnPxvebKW/aI0EJ7MK8sAI9Fw=;7:VbIbLniEqgD7v9JtHjoP8+agpcgzkch9woZO+ZmEd/KPv4CBuI1shEIURHW6LNpZMuQf2vRJUjKVCC+08ZgSe9d281UNZR3irZ03MKOSWCxIkSctB573E1/BHJ1z3QcTzr2BtYQF7+T6sp4VqH8nonvzJettpcsZEz054yi+LrMstut9qToJIPzhDnW/s3wHTcZzSPqZbrT4/KEPqV+XlghdWrvhdbJ1t8EIjmng43W0Jgg1DlSdM/zQe+m5CiJa x-ms-office365-filtering-correlation-id: 757b4f70-dbe5-4707-a37c-08d6222d0f2e x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989299)(5600074)(711020)(4618075)(4534165)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7193020);SRVR:CY4PR21MB0181; 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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: 6oV10wwPw10yL1X6QMtFPGoZzr0akopg1EeOuEI3EL72nx0do+OxFfAnpzxQk05mEs6tk1k8+79Asai4ncAZW0j4DE4fCKWd5IQkxm5nHv5NKhSlt/sY8WKR8j1c0FV8SWJR0GPyyc7xmWRXC5c1ZCIXEXs7aXrpUXF/EN18jgVrs6Tg5x77STHZaWlQGXMLl2q3JI52ZZZM2U4i8lIIRueDfZgU6WzumUWefYXoS5iZxU3AeTMVU1hzsIbavwIWV3Bjq5YBzsNdjcPy72Y+g26WsWJOCJcRQ1F5vX1m0QB4EdqM7HW8RWMrSn7K9YxLPSk8ZdWsZ3nN12Q9OezHNazDXDs9S7D7npgCAVvu6Uo= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 757b4f70-dbe5-4707-a37c-08d6222d0f2e X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Sep 2018 14:49:24.2366 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0181 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Paul Mackerras [ Upstream commit 46dec40fb741f00f1864580130779aeeaf24fb3d ] This fixes a bug which causes guest virtual addresses to get translated to guest real addresses incorrectly when the guest is using the HPT MMU and has more than 256GB of RAM, or more specifically has a HPT larger than 2GB. This has showed up in testing as a failure of the host to emulate doorbell instructions correctly on POWER9 for HPT guests with more than 256GB of RAM. The bug is that the HPTE index in kvmppc_mmu_book3s_64_hv_xlate() is stored as an int, and in forming the HPTE address, the index gets shifted left 4 bits as an int before being signed-extended to 64 bits. The simple fix is to make the variable a long int, matching the return type of kvmppc_hv_find_lock_hpte(), which is what calculates the index. Fixes: 697d3899dcb4 ("KVM: PPC: Implement MMIO emulation support for Book3S= HV guests") Signed-off-by: Paul Mackerras Signed-off-by: Sasha Levin --- arch/powerpc/kvm/book3s_64_mmu_hv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_= 64_mmu_hv.c index 05f09ae82587..915e89fcd946 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -314,7 +314,7 @@ static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcp= u *vcpu, gva_t eaddr, unsigned long pp, key; unsigned long v, gr; __be64 *hptep; - int index; + long int index; int virtmode =3D vcpu->arch.shregs.msr & (data ? MSR_DR : MSR_IR); =20 /* Get SLB entry */ --=20 2.17.1