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helo=lists.xenproject.org; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C From: Vikram Garhwal To: CC: , Juergen Gross , Vikram Garhwal , Anthony Perard , "Paul Durrant" , Paolo Bonzini , Peter Xu , David Hildenbrand , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , "open list:X86 Xen CPUs" Subject: [QEMU][PATCH v1 6/7] xen: add map and unmap callbacks for grant region Date: Thu, 5 Oct 2023 11:16:28 -0700 Message-ID: <20231005181629.4046-7-vikram.garhwal@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231005181629.4046-1-vikram.garhwal@amd.com> References: <20231005181629.4046-1-vikram.garhwal@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF00017095:EE_|SJ0PR12MB6926:EE_ X-MS-Office365-Filtering-Correlation-Id: 30a38abe-ecbe-4f11-23a0-08dbc5cf4e4e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Oct 2023 18:17:16.4921 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 30a38abe-ecbe-4f11-23a0-08dbc5cf4e4e X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF00017095.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6926 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1696529868618100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Juergen Gross Add the callbacks for mapping/unmapping guest memory via grants to the special grant memory region. Signed-off-by: Juergen Gross Signed-off-by: Vikram Garhwal --- hw/xen/xen-mapcache.c | 167 +++++++++++++++++++++++++++++++++++++++++- softmmu/physmem.c | 11 ++- 2 files changed, 173 insertions(+), 5 deletions(-) diff --git a/hw/xen/xen-mapcache.c b/hw/xen/xen-mapcache.c index 8a61c7dde6..52844a6a9d 100644 --- a/hw/xen/xen-mapcache.c +++ b/hw/xen/xen-mapcache.c @@ -9,6 +9,8 @@ */ =20 #include "qemu/osdep.h" +#include "qemu/queue.h" +#include "qemu/thread.h" #include "qemu/units.h" #include "qemu/error-report.h" =20 @@ -23,6 +25,8 @@ #include "sysemu/xen-mapcache.h" #include "trace.h" =20 +#include +#include =20 //#define MAPCACHE_DEBUG =20 @@ -385,7 +389,7 @@ uint8_t *xen_map_cache(hwaddr phys_addr, hwaddr size, return p; } =20 -ram_addr_t xen_ram_addr_from_mapcache(void *ptr) +static ram_addr_t xen_ram_addr_from_mapcache_try(void *ptr) { MapCacheEntry *entry =3D NULL; MapCacheRev *reventry; @@ -594,10 +598,170 @@ uint8_t *xen_replace_cache_entry(hwaddr old_phys_add= r, return p; } =20 +struct XENMappedGrantRegion { + void *addr; + unsigned int pages; + unsigned int refs; + unsigned int prot; + uint32_t idx; + QLIST_ENTRY(XENMappedGrantRegion) list; +}; + +static xengnttab_handle *xen_region_gnttabdev; +static QLIST_HEAD(GrantRegionList, XENMappedGrantRegion) xen_grant_mapping= s =3D + QLIST_HEAD_INITIALIZER(xen_grant_mappings); +static QemuMutex xen_map_mutex; + +static void *xen_map_grant_dyn(MemoryRegion **mr, hwaddr addr, hwaddr *ple= n, + bool is_write, MemTxAttrs attrs) +{ + unsigned int page_off =3D addr & (XC_PAGE_SIZE - 1); + unsigned int i; + unsigned int nrefs =3D (page_off + *plen + XC_PAGE_SIZE - 1) >> XC_PAG= E_SHIFT; + uint32_t ref =3D (addr - XEN_GRANT_ADDR_OFF) >> XC_PAGE_SHIFT; + uint32_t *refs =3D NULL; + unsigned int prot =3D PROT_READ; + struct XENMappedGrantRegion *mgr =3D NULL; + + if (is_write) { + prot |=3D PROT_WRITE; + } + + qemu_mutex_lock(&xen_map_mutex); + + QLIST_FOREACH(mgr, &xen_grant_mappings, list) { + if (mgr->idx =3D=3D ref && + mgr->pages =3D=3D nrefs && + (mgr->prot & prot) =3D=3D prot) { + break; + } + } + if (!mgr) { + mgr =3D g_new(struct XENMappedGrantRegion, 1); + + if (nrefs =3D=3D 1) { + refs =3D &ref; + } else { + refs =3D g_new(uint32_t, nrefs); + for (i =3D 0; i < nrefs; i++) { + refs[i] =3D ref + i; + } + } + mgr->addr =3D xengnttab_map_domain_grant_refs(xen_region_gnttabdev= , nrefs, + xen_domid, refs, prot); + if (mgr->addr) { + mgr->pages =3D nrefs; + mgr->refs =3D 1; + mgr->prot =3D prot; + mgr->idx =3D ref; + + QLIST_INSERT_HEAD(&xen_grant_mappings, mgr, list); + } else { + g_free(mgr); + mgr =3D NULL; + } + } else { + mgr->refs++; + } + + qemu_mutex_unlock(&xen_map_mutex); + + if (nrefs > 1) { + g_free(refs); + } + + return mgr ? mgr->addr + page_off : NULL; +} + +static void xen_unmap_grant_dyn(MemoryRegion *mr, void *buffer, ram_addr_t= addr, + hwaddr len, bool is_write, hwaddr access_l= en) +{ + unsigned int page_off =3D (unsigned long)buffer & (XC_PAGE_SIZE - 1); + unsigned int nrefs =3D (page_off + len + XC_PAGE_SIZE - 1) >> XC_PAGE_= SHIFT; + unsigned int prot =3D PROT_READ; + struct XENMappedGrantRegion *mgr =3D NULL; + + if (is_write) { + prot |=3D PROT_WRITE; + } + + qemu_mutex_lock(&xen_map_mutex); + + QLIST_FOREACH(mgr, &xen_grant_mappings, list) { + if (mgr->addr =3D=3D buffer - page_off && + mgr->pages =3D=3D nrefs && + (mgr->prot & prot) =3D=3D prot) { + break; + } + } + if (mgr) { + mgr->refs--; + if (!mgr->refs) { + xengnttab_unmap(xen_region_gnttabdev, mgr->addr, nrefs); + + QLIST_REMOVE(mgr, list); + g_free(mgr); + } + } else { + error_report("xen_unmap_grant_dyn() trying to unmap unknown buffer= "); + } + + qemu_mutex_unlock(&xen_map_mutex); +} + +static ram_addr_t xen_ram_addr_from_grant_cache(void *ptr) +{ + unsigned int page_off =3D (unsigned long)ptr & (XC_PAGE_SIZE - 1); + struct XENMappedGrantRegion *mgr =3D NULL; + ram_addr_t raddr =3D RAM_ADDR_INVALID; + + qemu_mutex_lock(&xen_map_mutex); + + QLIST_FOREACH(mgr, &xen_grant_mappings, list) { + if (mgr->addr =3D=3D ptr - page_off) { + break; + } + } + + if (mgr) { + raddr =3D (mgr->idx << XC_PAGE_SHIFT) + page_off + XEN_GRANT_ADDR_= OFF; + } + + qemu_mutex_unlock(&xen_map_mutex); + + return raddr; +} + +ram_addr_t xen_ram_addr_from_mapcache(void *ptr) +{ + ram_addr_t raddr; + + raddr =3D xen_ram_addr_from_mapcache_try(ptr); + if (raddr =3D=3D RAM_ADDR_INVALID) { + raddr =3D xen_ram_addr_from_grant_cache(ptr); + } + + return raddr; +} + +static const struct MemoryRegionOps xen_grant_mr_ops =3D { + .map =3D xen_map_grant_dyn, + .unmap =3D xen_unmap_grant_dyn, + .endianness =3D DEVICE_LITTLE_ENDIAN, +}; + MemoryRegion *xen_init_grant_ram(void) { RAMBlock *block; =20 + qemu_mutex_init(&xen_map_mutex); + + xen_region_gnttabdev =3D xengnttab_open(NULL, 0); + if (xen_region_gnttabdev =3D=3D NULL) { + fprintf(stderr, "can't open gnttab device\n"); + return NULL; + } + memory_region_init(&ram_grants, NULL, "xen.grants", XEN_MAX_VIRTIO_GRANTS * XC_PAGE_SIZE); block =3D g_malloc0(sizeof(*block)); @@ -612,6 +776,7 @@ MemoryRegion *xen_init_grant_ram(void) ram_grants.ram_block =3D block; ram_grants.ram =3D true; ram_grants.terminates =3D true; + ram_grants.ops =3D &xen_grant_mr_ops; ram_block_add_list(block); memory_region_add_subregion(get_system_memory(), XEN_GRANT_ADDR_OFF, &ram_grants); diff --git a/softmmu/physmem.c b/softmmu/physmem.c index 5f425bea1c..e5346386db 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -2250,13 +2250,16 @@ RAMBlock *qemu_ram_block_from_host(void *ptr, bool = round_offset, =20 if (xen_enabled()) { ram_addr_t ram_addr; + RCU_READ_LOCK_GUARD(); ram_addr =3D xen_ram_addr_from_mapcache(ptr); - block =3D qemu_get_ram_block(ram_addr); - if (block) { - *offset =3D ram_addr - block->offset; + if (ram_addr !=3D RAM_ADDR_INVALID) { + block =3D qemu_get_ram_block(ram_addr); + if (block) { + *offset =3D ram_addr - block->offset; + } + return block; } - return block; } =20 RCU_READ_LOCK_GUARD(); --=20 2.17.1