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X-Received-From: 185.25.65.24 Subject: [Qemu-devel] [PATCH 4/4] xen: don't use xenstore to save/restore physmap anymore X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: anthony.perard@citrix.com, Igor Druzhinin , sstabellini@kernel.org, paul.durrant@citrix.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If we have a system with xenforeignmemory_map2() implemented we don't need to save/restore physmap on suspend/restore anymore. In case we resume a VM without physmap - try to recreate the physmap during memory region restore phase and remap map cache entries accordingly. The old code is left for compatibility reasons. Signed-off-by: Igor Druzhinin --- hw/i386/xen/xen-hvm.c | 45 ++++++++++++++++++++++++++++++++++-------= ---- include/hw/xen/xen_common.h | 1 + 2 files changed, 35 insertions(+), 11 deletions(-) diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c index d259cf7..1b6a5ce 100644 --- a/hw/i386/xen/xen-hvm.c +++ b/hw/i386/xen/xen-hvm.c @@ -305,6 +305,7 @@ static hwaddr xen_phys_offset_to_gaddr(hwaddr start_add= r, return start_addr; } =20 +#ifdef XEN_COMPAT_PHYSMAP static int xen_save_physmap(XenIOState *state, XenPhysmap *physmap) { char path[80], value[17]; @@ -334,6 +335,12 @@ static int xen_save_physmap(XenIOState *state, XenPhys= map *physmap) } return 0; } +#else +static int xen_save_physmap(XenIOState *state, XenPhysmap *physmap) +{ + return 0; +} +#endif =20 static int xen_add_to_physmap(XenIOState *state, hwaddr start_addr, @@ -368,6 +375,26 @@ go_physmap: DPRINTF("mapping vram to %"HWADDR_PRIx" - %"HWADDR_PRIx"\n", start_addr, start_addr + size); =20 + mr_name =3D memory_region_name(mr); + + physmap =3D g_malloc(sizeof (XenPhysmap)); + + physmap->start_addr =3D start_addr; + physmap->size =3D size; + physmap->name =3D mr_name; + physmap->phys_offset =3D phys_offset; + + QLIST_INSERT_HEAD(&state->physmap, physmap, list); + + if (runstate_check(RUN_STATE_INMIGRATE)) { + /* Now when we have a physmap entry we can remap a dummy mapping a= nd change + * it to a real one of guest foreign memory. */ + uint8_t *p =3D xen_remap_cache_entry(phys_offset, size); + assert(p && p =3D=3D memory_region_get_ram_ptr(mr)); + + return 0; + } + pfn =3D phys_offset >> TARGET_PAGE_BITS; start_gpfn =3D start_addr >> TARGET_PAGE_BITS; for (i =3D 0; i < size >> TARGET_PAGE_BITS; i++) { @@ -382,21 +409,11 @@ go_physmap: } } =20 - mr_name =3D memory_region_name(mr); - - physmap =3D g_malloc(sizeof (XenPhysmap)); - - physmap->start_addr =3D start_addr; - physmap->size =3D size; - physmap->name =3D mr_name; - physmap->phys_offset =3D phys_offset; - - QLIST_INSERT_HEAD(&state->physmap, physmap, list); - xc_domain_pin_memory_cacheattr(xen_xc, xen_domid, start_addr >> TARGET_PAGE_BITS, (start_addr + size - 1) >> TARGET_PAGE_= BITS, XEN_DOMCTL_MEM_CACHEATTR_WB); + return xen_save_physmap(state, physmap); } =20 @@ -1158,6 +1175,7 @@ static void xen_exit_notifier(Notifier *n, void *data) xs_daemon_close(state->xenstore); } =20 +#ifdef XEN_COMPAT_PHYSMAP static void xen_read_physmap(XenIOState *state) { XenPhysmap *physmap =3D NULL; @@ -1205,6 +1223,11 @@ static void xen_read_physmap(XenIOState *state) } free(entries); } +#else +static void xen_read_physmap(XenIOState *state) +{ +} +#endif =20 static void xen_wakeup_notifier(Notifier *notifier, void *data) { diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h index 70a5cad..c04c5c9 100644 --- a/include/hw/xen/xen_common.h +++ b/include/hw/xen/xen_common.h @@ -80,6 +80,7 @@ extern xenforeignmemory_handle *xen_fmem; =20 #if CONFIG_XEN_CTRL_INTERFACE_VERSION < 41000 =20 +#define XEN_COMPAT_PHYSMAP #define xenforeignmemory_map2(h, d, a, p, f, ps, ar, e) \ xenforeignmemory_map(h, d, p, ps, ar, e) =20 --=20 2.7.4