Merge remote-tracking branch 'remotes/sstabellini/xen-140507-2' into staging

* remotes/sstabellini/xen-140507-2:
  xen_disk: add discard support
  pass an inclusive address range to xc_domain_pin_memory_cacheattr
  xen: factor out common functions
  xen: move Xen HVM files under hw/i386/xen
  xen: move Xen PV machine files to hw/xenpv
  qemu-xen: free all the pirqs for msi/msix when driver unload
  exec: Limit translation limiting in address_space_translate to xen

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Makefile.target

@@ -120,8 +120,10 @@ obj-y += dump.o
 LIBS+=$(libs_softmmu)
 
 # xen support
-obj-$(CONFIG_XEN) += xen-all.o xen-mapcache.o
-obj-$(call lnot,$(CONFIG_XEN)) += xen-stub.o
+obj-$(CONFIG_XEN) += xen-common.o
+obj-$(CONFIG_XEN_I386) += xen-hvm.o xen-mapcache.o
+obj-$(call lnot,$(CONFIG_XEN)) += xen-common-stub.o
+obj-$(call lnot,$(CONFIG_XEN_I386)) += xen-hvm-stub.o
 
 # Hardware support
 ifeq ($(TARGET_NAME), sparc64)

exec.c

@@ -380,7 +380,7 @@ MemoryRegion *address_space_translate(AddressSpace *as, hwaddr addr,
         as = iotlb.target_as;
     }
 
-    if (memory_access_is_direct(mr, is_write)) {
+    if (xen_enabled() && memory_access_is_direct(mr, is_write)) {
         hwaddr page = ((addr & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE) - addr;
         len = MIN(page, len);
     }

hw/block/xen_blkif.h

@@ -79,6 +79,12 @@ static inline void blkif_get_x86_32_req(blkif_request_t *dst, blkif_x86_32_reque
 	dst->handle = src->handle;
 	dst->id = src->id;
 	dst->sector_number = src->sector_number;
+	if (src->operation == BLKIF_OP_DISCARD) {
+		struct blkif_request_discard *s = (void *)src;
+		struct blkif_request_discard *d = (void *)dst;
+		d->nr_sectors = s->nr_sectors;
+		return;
+	}
 	if (n > src->nr_segments)
 		n = src->nr_segments;
 	for (i = 0; i < n; i++)
@@ -94,6 +100,12 @@ static inline void blkif_get_x86_64_req(blkif_request_t *dst, blkif_x86_64_reque
 	dst->handle = src->handle;
 	dst->id = src->id;
 	dst->sector_number = src->sector_number;
+	if (src->operation == BLKIF_OP_DISCARD) {
+		struct blkif_request_discard *s = (void *)src;
+		struct blkif_request_discard *d = (void *)dst;
+		d->nr_sectors = s->nr_sectors;
+		return;
+	}
 	if (n > src->nr_segments)
 		n = src->nr_segments;
 	for (i = 0; i < n; i++)

hw/block/xen_disk.c

@@ -114,6 +114,7 @@ struct XenBlkDev {
     int                 requests_finished;
 
     /* Persistent grants extension */
+    gboolean            feature_discard;
     gboolean            feature_persistent;
     GTree               *persistent_gnts;
     unsigned int        persistent_gnt_count;
@@ -253,6 +254,8 @@ static int ioreq_parse(struct ioreq *ioreq)
     case BLKIF_OP_WRITE:
         ioreq->prot = PROT_READ; /* from memory */
         break;
+    case BLKIF_OP_DISCARD:
+        return 0;
     default:
         xen_be_printf(&blkdev->xendev, 0, "error: unknown operation (%d)\n",
                       ioreq->req.operation);
@@ -492,6 +495,7 @@ static void qemu_aio_complete(void *opaque, int ret)
     case BLKIF_OP_READ:
         bdrv_acct_done(ioreq->blkdev->bs, &ioreq->acct);
         break;
+    case BLKIF_OP_DISCARD:
     default:
         break;
     }
@@ -532,6 +536,15 @@ static int ioreq_runio_qemu_aio(struct ioreq *ioreq)
                         &ioreq->v, ioreq->v.size / BLOCK_SIZE,
                         qemu_aio_complete, ioreq);
         break;
+    case BLKIF_OP_DISCARD:
+    {
+        struct blkif_request_discard *discard_req = (void *)&ioreq->req;
+        ioreq->aio_inflight++;
+        bdrv_aio_discard(blkdev->bs,
+                        discard_req->sector_number, discard_req->nr_sectors,
+                        qemu_aio_complete, ioreq);
+        break;
+    }
     default:
         /* unknown operation (shouldn't happen -- parse catches this) */
         goto err;
@@ -710,6 +723,21 @@ static void blk_alloc(struct XenDevice *xendev)
     }
 }
 
+static void blk_parse_discard(struct XenBlkDev *blkdev)
+{
+    int enable;
+
+    blkdev->feature_discard = true;
+
+    if (xenstore_read_be_int(&blkdev->xendev, "discard-enable", &enable) == 0) {
+        blkdev->feature_discard = !!enable;
+    }
+
+    if (blkdev->feature_discard) {
+        xenstore_write_be_int(&blkdev->xendev, "feature-discard", 1);
+    }
+}
+
 static int blk_init(struct XenDevice *xendev)
 {
     struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
@@ -777,6 +805,8 @@ static int blk_init(struct XenDevice *xendev)
     xenstore_write_be_int(&blkdev->xendev, "feature-persistent", 1);
     xenstore_write_be_int(&blkdev->xendev, "info", info);
 
+    blk_parse_discard(blkdev);
+
     g_free(directiosafe);
     return 0;
 
@@ -812,6 +842,9 @@ static int blk_connect(struct XenDevice *xendev)
         qflags |= BDRV_O_RDWR;
         readonly = false;
     }
+    if (blkdev->feature_discard) {
+        qflags |= BDRV_O_UNMAP;
+    }
 
     /* init qemu block driver */
     index = (blkdev->xendev.dev - 202 * 256) / 16;

hw/i386/Makefile.objs

@@ -2,7 +2,7 @@ obj-$(CONFIG_KVM) += kvm/
 obj-y += multiboot.o smbios.o
 obj-y += pc.o pc_piix.o pc_q35.o
 obj-y += pc_sysfw.o
-obj-$(CONFIG_XEN) += xen_domainbuild.o xen_machine_pv.o
+obj-$(CONFIG_XEN) += ../xenpv/ xen/
 
 obj-y += kvmvapic.o
 obj-y += acpi-build.o

hw/i386/xen/Makefile.objs

@@ -0,0 +1 @@
+obj-y += xen_platform.o xen_apic.o xen_pvdevice.o

hw/xen/Makefile.objs

@@ -1,6 +1,5 @@
 # xen backend driver support
 common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o
 
-obj-$(CONFIG_XEN_I386) += xen_platform.o xen_apic.o xen_pvdevice.o
 obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
 obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_msi.o

hw/xen/xen_pt_config_init.c

@@ -1123,8 +1123,8 @@ static int xen_pt_msgctrl_reg_write(XenPCIPassthroughState *s,
             msi->mapped = true;
         }
         msi->flags |= PCI_MSI_FLAGS_ENABLE;
-    } else {
-        msi->flags &= ~PCI_MSI_FLAGS_ENABLE;
+    } else if (msi->mapped) {
+        xen_pt_msi_disable(s);
     }
 
     /* pass through MSI_ENABLE bit */
@@ -1397,6 +1397,8 @@ static int xen_pt_msixctrl_reg_write(XenPCIPassthroughState *s,
     if ((*val & PCI_MSIX_FLAGS_ENABLE)
         && !(*val & PCI_MSIX_FLAGS_MASKALL)) {
         xen_pt_msix_update(s);
+    } else if (!(*val & PCI_MSIX_FLAGS_ENABLE) && s->msix->enabled) {
+        xen_pt_msix_disable(s);
     }
 
     debug_msix_enabled_old = s->msix->enabled;

hw/xen/xen_pt_msi.c

@@ -282,7 +282,8 @@ void xen_pt_msi_disable(XenPCIPassthroughState *s)
                      msi->initialized);
 
     /* clear msi info */
-    msi->flags = 0;
+    msi->flags &= ~PCI_MSI_FLAGS_ENABLE;
+    msi->initialized = false;
     msi->mapped = false;
     msi->pirq = XEN_PT_UNASSIGNED_PIRQ;
 }
@@ -446,7 +447,8 @@ static void pci_msix_write(void *opaque, hwaddr addr,
     if (offset != PCI_MSIX_ENTRY_VECTOR_CTRL) {
         const volatile uint32_t *vec_ctrl;
 
-        if (get_entry_value(entry, offset) == val) {
+        if (get_entry_value(entry, offset) == val
+            && entry->pirq != XEN_PT_UNASSIGNED_PIRQ) {
             return;
         }
 

hw/xenpv/Makefile.objs

@@ -0,0 +1,2 @@
+# Xen PV machine support
+obj-$(CONFIG_XEN) += xen_domainbuild.o xen_machine_pv.o

include/hw/xen/xen_common.h

@@ -144,6 +144,13 @@ static inline int xen_xc_hvm_inject_msi(XenXC xen_xc, domid_t dom,
 {
     return -ENOSYS;
 }
+/* The followings are only to compile op_discard related code on older
+ * Xen releases. */
+#define BLKIF_OP_DISCARD 5
+struct blkif_request_discard {
+    uint64_t nr_sectors;
+    uint64_t sector_number;
+};
 #else
 static inline int xen_xc_hvm_inject_msi(XenXC xen_xc, domid_t dom,
         uint64_t addr, uint32_t data)

xen-common-stub.c

@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2014       Citrix Systems UK Ltd.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu-common.h"
+#include "hw/xen/xen.h"
+
+void xenstore_store_pv_console_info(int i, CharDriverState *chr)
+{
+}
+
+int xen_init(MachineClass *mc)
+{
+    return -ENOSYS;
+}
+

xen-common.c

@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2014       Citrix Systems UK Ltd.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
+ */
+
+#include "hw/xen/xen_backend.h"
+#include "qmp-commands.h"
+#include "sysemu/char.h"
+
+//#define DEBUG_XEN
+
+#ifdef DEBUG_XEN
+#define DPRINTF(fmt, ...) \
+    do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) \
+    do { } while (0)
+#endif
+
+static int store_dev_info(int domid, CharDriverState *cs, const char *string)
+{
+    struct xs_handle *xs = NULL;
+    char *path = NULL;
+    char *newpath = NULL;
+    char *pts = NULL;
+    int ret = -1;
+
+    /* Only continue if we're talking to a pty. */
+    if (strncmp(cs->filename, "pty:", 4)) {
+        return 0;
+    }
+    pts = cs->filename + 4;
+
+    /* We now have everything we need to set the xenstore entry. */
+    xs = xs_open(0);
+    if (xs == NULL) {
+        fprintf(stderr, "Could not contact XenStore\n");
+        goto out;
+    }
+
+    path = xs_get_domain_path(xs, domid);
+    if (path == NULL) {
+        fprintf(stderr, "xs_get_domain_path() error\n");
+        goto out;
+    }
+    newpath = realloc(path, (strlen(path) + strlen(string) +
+                strlen("/tty") + 1));
+    if (newpath == NULL) {
+        fprintf(stderr, "realloc error\n");
+        goto out;
+    }
+    path = newpath;
+
+    strcat(path, string);
+    strcat(path, "/tty");
+    if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
+        fprintf(stderr, "xs_write for '%s' fail", string);
+        goto out;
+    }
+    ret = 0;
+
+out:
+    free(path);
+    xs_close(xs);
+
+    return ret;
+}
+
+void xenstore_store_pv_console_info(int i, CharDriverState *chr)
+{
+    if (i == 0) {
+        store_dev_info(xen_domid, chr, "/console");
+    } else {
+        char buf[32];
+        snprintf(buf, sizeof(buf), "/device/console/%d", i);
+        store_dev_info(xen_domid, chr, buf);
+    }
+}
+
+
+static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
+{
+    char path[50];
+
+    if (xs == NULL) {
+        fprintf(stderr, "xenstore connection not initialized\n");
+        exit(1);
+    }
+
+    snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
+    if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
+        fprintf(stderr, "error recording dm state\n");
+        exit(1);
+    }
+}
+
+
+static void xen_change_state_handler(void *opaque, int running,
+                                     RunState state)
+{
+    if (running) {
+        /* record state running */
+        xenstore_record_dm_state(xenstore, "running");
+    }
+}
+
+int xen_init(MachineClass *mc)
+{
+    xen_xc = xen_xc_interface_open(0, 0, 0);
+    if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
+        xen_be_printf(NULL, 0, "can't open xen interface\n");
+        return -1;
+    }
+    qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
+
+    return 0;
+}
+

xen-hvm-stub.c

@@ -13,10 +13,6 @@
 #include "exec/memory.h"
 #include "qmp-commands.h"
 
-void xenstore_store_pv_console_info(int i, CharDriverState *chr)
-{
-}
-
 int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
 {
     return -1;
@@ -47,19 +43,10 @@ qemu_irq *xen_interrupt_controller_init(void)
     return NULL;
 }
 
-int xen_init(MachineClass *mc)
-{
-    return -ENOSYS;
-}
-
 void xen_register_framebuffer(MemoryRegion *mr)
 {
 }
 
-void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
-{
-}
-
 void xen_modified_memory(ram_addr_t start, ram_addr_t length)
 {
 }
@@ -68,3 +55,7 @@ int xen_hvm_init(MemoryRegion **ram_memory)
 {
     return 0;
 }
+
+void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
+{
+}

xen-hvm.c

@@ -26,9 +26,9 @@
 #include <xen/hvm/params.h>
 #include <xen/hvm/e820.h>
 
-//#define DEBUG_XEN
+//#define DEBUG_XEN_HVM
 
-#ifdef DEBUG_XEN
+#ifdef DEBUG_XEN_HVM
 #define DPRINTF(fmt, ...) \
     do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
 #else
@@ -323,7 +323,7 @@ go_physmap:
 
     xc_domain_pin_memory_cacheattr(xen_xc, xen_domid,
                                    start_addr >> TARGET_PAGE_BITS,
-                                   (start_addr + size) >> TARGET_PAGE_BITS,
+                                   (start_addr + size - 1) >> TARGET_PAGE_BITS,
                                    XEN_DOMCTL_MEM_CACHEATTR_WB);
 
     snprintf(path, sizeof(path),
@@ -569,15 +569,6 @@ static MemoryListener xen_memory_listener = {
     .priority = 10,
 };
 
-void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
-{
-    if (enable) {
-        memory_global_dirty_log_start();
-    } else {
-        memory_global_dirty_log_stop();
-    }
-}
-
 /* get the ioreq packets from share mem */
 static ioreq_t *cpu_get_ioreq_from_shared_memory(XenIOState *state, int vcpu)
 {
@@ -880,82 +871,6 @@ static void cpu_handle_ioreq(void *opaque)
     }
 }
 
-static int store_dev_info(int domid, CharDriverState *cs, const char *string)
-{
-    struct xs_handle *xs = NULL;
-    char *path = NULL;
-    char *newpath = NULL;
-    char *pts = NULL;
-    int ret = -1;
-
-    /* Only continue if we're talking to a pty. */
-    if (strncmp(cs->filename, "pty:", 4)) {
-        return 0;
-    }
-    pts = cs->filename + 4;
-
-    /* We now have everything we need to set the xenstore entry. */
-    xs = xs_open(0);
-    if (xs == NULL) {
-        fprintf(stderr, "Could not contact XenStore\n");
-        goto out;
-    }
-
-    path = xs_get_domain_path(xs, domid);
-    if (path == NULL) {
-        fprintf(stderr, "xs_get_domain_path() error\n");
-        goto out;
-    }
-    newpath = realloc(path, (strlen(path) + strlen(string) +
-                strlen("/tty") + 1));
-    if (newpath == NULL) {
-        fprintf(stderr, "realloc error\n");
-        goto out;
-    }
-    path = newpath;
-
-    strcat(path, string);
-    strcat(path, "/tty");
-    if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
-        fprintf(stderr, "xs_write for '%s' fail", string);
-        goto out;
-    }
-    ret = 0;
-
-out:
-    free(path);
-    xs_close(xs);
-
-    return ret;
-}
-
-void xenstore_store_pv_console_info(int i, CharDriverState *chr)
-{
-    if (i == 0) {
-        store_dev_info(xen_domid, chr, "/console");
-    } else {
-        char buf[32];
-        snprintf(buf, sizeof(buf), "/device/console/%d", i);
-        store_dev_info(xen_domid, chr, buf);
-    }
-}
-
-static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
-{
-    char path[50];
-
-    if (xs == NULL) {
-        fprintf(stderr, "xenstore connection not initialized\n");
-        exit(1);
-    }
-
-    snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
-    if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
-        fprintf(stderr, "error recording dm state\n");
-        exit(1);
-    }
-}
-
 static void xen_main_loop_prepare(XenIOState *state)
 {
     int evtchn_fd = -1;
@@ -973,17 +888,6 @@ static void xen_main_loop_prepare(XenIOState *state)
 }
 
 
-/* Initialise Xen */
-
-static void xen_change_state_handler(void *opaque, int running,
-                                     RunState state)
-{
-    if (running) {
-        /* record state running */
-        xenstore_record_dm_state(xenstore, "running");
-    }
-}
-
 static void xen_hvm_change_state_handler(void *opaque, int running,
                                          RunState rstate)
 {
@@ -1001,18 +905,6 @@ static void xen_exit_notifier(Notifier *n, void *data)
     xs_daemon_close(state->xenstore);
 }
 
-int xen_init(MachineClass *mc)
-{
-    xen_xc = xen_xc_interface_open(0, 0, 0);
-    if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
-        xen_be_printf(NULL, 0, "can't open xen interface\n");
-        return -1;
-    }
-    qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
-
-    return 0;
-}
-
 static void xen_read_physmap(XenIOState *state)
 {
     XenPhysmap *physmap = NULL;
@@ -1226,3 +1118,12 @@ void xen_modified_memory(ram_addr_t start, ram_addr_t length)
         }
     }
 }
+
+void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
+{
+    if (enable) {
+        memory_global_dirty_log_start();
+    } else {
+        memory_global_dirty_log_stop();
+    }
+}