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Message-ID: Date: Tue, 16 May 2023 09:41:53 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.10.1 Subject: [PATCH v3 10/12] x86/shadow: make monitor table create/destroy more consistent Content-Language: en-US From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Wei Liu , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , George Dunlap , Tim Deegan References: <184df995-e668-1cea-6f9f-8e79a1ffcbbd@suse.com> In-Reply-To: <184df995-e668-1cea-6f9f-8e79a1ffcbbd@suse.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: FR2P281CA0080.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:9a::13) To VE1PR04MB6560.eurprd04.prod.outlook.com (2603:10a6:803:122::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VE1PR04MB6560:EE_|VI1PR04MB9810:EE_ X-MS-Office365-Filtering-Correlation-Id: dbe1e6a5-356f-4983-1220-08db55e10545 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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charset="utf-8" While benign at present, it is still a little fragile to operate on a wrong "old_mode" value in sh_update_paging_modes(). This can happen when no monitor table was present initially - we'd create one for the new mode without updating old_mode. Correct this in two ways, each of which would be sufficient on its own: Once by adding "else" to the second of the involved if()s in the function, and then by setting the correct initial mode for HVM domains in shadow_vcpu_init(). Further use the same predicate (paging_mode_external()) consistently when dealing with shadow mode init/update/cleanup, rather than a mix of is_hvm_vcpu() (init), is_hvm_domain() (update), and paging_mode_external() (cleanup). Finally drop a redundant is_hvm_domain() from inside the bigger if() (which is being converted to paging_mode_external()) in sh_update_paging_modes(). Signed-off-by: Jan Beulich --- v2: Style adjustment. --- a/xen/arch/x86/mm/shadow/common.c +++ b/xen/arch/x86/mm/shadow/common.c @@ -119,9 +119,9 @@ void shadow_vcpu_init(struct vcpu *v) } #endif =20 - v->arch.paging.mode =3D is_hvm_vcpu(v) ? - &SHADOW_INTERNAL_NAME(sh_paging_mode, 3) : - &SHADOW_INTERNAL_NAME(sh_paging_mode, 4); + v->arch.paging.mode =3D paging_mode_external(v->domain) + ? &SHADOW_INTERNAL_NAME(sh_paging_mode, 2) + : &SHADOW_INTERNAL_NAME(sh_paging_mode, 4); } =20 #if SHADOW_AUDIT @@ -1801,7 +1801,7 @@ static void sh_update_paging_modes(struc sh_detach_old_tables(v); =20 #ifdef CONFIG_HVM - if ( is_hvm_domain(d) ) + if ( paging_mode_external(d) ) { const struct paging_mode *old_mode =3D v->arch.paging.mode; =20 @@ -1854,13 +1854,12 @@ static void sh_update_paging_modes(struc make_cr3(v, mmfn); hvm_update_host_cr3(v); } - - if ( v->arch.paging.mode !=3D old_mode ) + else if ( v->arch.paging.mode !=3D old_mode ) { SHADOW_PRINTK("new paging mode: %pv pe=3D%d gl=3D%u " "sl=3D%u (was g=3D%u s=3D%u)\n", v, - is_hvm_domain(d) ? hvm_paging_enabled(v) : 1, + hvm_paging_enabled(v), v->arch.paging.mode->guest_levels, v->arch.paging.mode->shadow.shadow_levels, old_mode ? old_mode->guest_levels : 0,