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Message-ID: <6047c192-0f37-e4ff-5980-fd137b3f1869@suse.com> Date: Thu, 28 Sep 2023 09:16:20 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 Subject: [PATCH v4 5/9] x86/mem-sharing: copy GADDR based shared guest areas Content-Language: en-US From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , George Dunlap , Julien Grall , Stefano Stabellini , Wei Liu , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Henry Wang , Tamas K Lengyel References: <3ba59868-101d-b68a-d8b7-767ee94910ec@suse.com> In-Reply-To: <3ba59868-101d-b68a-d8b7-767ee94910ec@suse.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: FR4P281CA0086.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:cd::13) To DU2PR04MB8790.eurprd04.prod.outlook.com (2603:10a6:10:2e1::23) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DU2PR04MB8790:EE_|AM8PR04MB7811:EE_ X-MS-Office365-Filtering-Correlation-Id: e5f8ad04-a696-43e7-6917-08dbbff2d1db X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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charset="utf-8" In preparation of the introduction of new vCPU operations allowing to register the respective areas (one of the two is x86-specific) by guest-physical address, add the necessary fork handling (with the backing function yet to be filled in). Signed-off-by: Jan Beulich --- v3: Extend comment. --- a/xen/arch/x86/mm/mem_sharing.c +++ b/xen/arch/x86/mm/mem_sharing.c @@ -1641,6 +1641,68 @@ static void copy_vcpu_nonreg_state(struc hvm_set_nonreg_state(cd_vcpu, &nrs); } =20 +static int copy_guest_area(struct guest_area *cd_area, + const struct guest_area *d_area, + struct vcpu *cd_vcpu, + const struct domain *d) +{ + mfn_t d_mfn, cd_mfn; + + if ( !d_area->pg ) + return 0; + + d_mfn =3D page_to_mfn(d_area->pg); + + /* Allocate & map a page for the area if it hasn't been already. */ + if ( !cd_area->pg ) + { + gfn_t gfn =3D mfn_to_gfn(d, d_mfn); + struct p2m_domain *p2m =3D p2m_get_hostp2m(cd_vcpu->domain); + p2m_type_t p2mt; + p2m_access_t p2ma; + unsigned int offset; + int ret; + + cd_mfn =3D p2m->get_entry(p2m, gfn, &p2mt, &p2ma, 0, NULL, NULL); + if ( mfn_eq(cd_mfn, INVALID_MFN) ) + { + struct page_info *pg =3D alloc_domheap_page(cd_vcpu->domain, 0= ); + + if ( !pg ) + return -ENOMEM; + + cd_mfn =3D page_to_mfn(pg); + set_gpfn_from_mfn(mfn_x(cd_mfn), gfn_x(gfn)); + + ret =3D p2m->set_entry(p2m, gfn, cd_mfn, PAGE_ORDER_4K, p2m_ra= m_rw, + p2m->default_access, -1); + if ( ret ) + return ret; + } + else if ( p2mt !=3D p2m_ram_rw ) + return -EBUSY; + + /* + * Map the area into the guest. For simplicity specify the entire = range + * up to the end of the page: All the function uses it for is to c= heck + * that the range doesn't cross page boundaries. Having the area m= apped + * in the original domain implies that it fits there and therefore= will + * also fit in the clone. + */ + offset =3D PAGE_OFFSET(d_area->map); + ret =3D map_guest_area(cd_vcpu, gfn_to_gaddr(gfn) + offset, + PAGE_SIZE - offset, cd_area, NULL); + if ( ret ) + return ret; + } + else + cd_mfn =3D page_to_mfn(cd_area->pg); + + copy_domain_page(cd_mfn, d_mfn); + + return 0; +} + static int copy_vpmu(struct vcpu *d_vcpu, struct vcpu *cd_vcpu) { struct vpmu_struct *d_vpmu =3D vcpu_vpmu(d_vcpu); @@ -1733,6 +1795,16 @@ static int copy_vcpu_settings(struct dom copy_domain_page(new_vcpu_info_mfn, vcpu_info_mfn); } =20 + /* Same for the (physically registered) runstate and time info are= as. */ + ret =3D copy_guest_area(&cd_vcpu->runstate_guest_area, + &d_vcpu->runstate_guest_area, cd_vcpu, d); + if ( ret ) + return ret; + ret =3D copy_guest_area(&cd_vcpu->arch.time_guest_area, + &d_vcpu->arch.time_guest_area, cd_vcpu, d); + if ( ret ) + return ret; + ret =3D copy_vpmu(d_vcpu, cd_vcpu); if ( ret ) return ret; @@ -1974,7 +2046,10 @@ int mem_sharing_fork_reset(struct domain =20 state: if ( reset_state ) + { rc =3D copy_settings(d, pd); + /* TBD: What to do here with -ERESTART? */ + } =20 domain_unpause(d); =20 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -1601,6 +1601,13 @@ void unmap_vcpu_info(struct vcpu *v) put_page_and_type(mfn_to_page(mfn)); } =20 +int map_guest_area(struct vcpu *v, paddr_t gaddr, unsigned int size, + struct guest_area *area, + void (*populate)(void *dst, struct vcpu *v)) +{ + return -EOPNOTSUPP; +} + /* * This is only intended to be used for domain cleanup (or more generally = only * with at least the respective vCPU, if it's not the current one, reliably