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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-11-30 17:07:59 -0500
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-11-30 17:07:59 -0500
commit6a7ed405114b2a53ccd99631b0636aaeabf71b3e (patch)
treef8bb0dcddc66c59843433e2283f6bea57cc8ce24 /drivers/xen
parenta7be94ac8d69c037d08f0fd94b45a593f1d45176 (diff)
parentf832da068b0aadb15f747f6427b6bf945f525ba4 (diff)
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Merge branch 'arm-privcmd-for-3.8' of git://xenbits.xen.org/people/ianc/linux into stable/for-linus-3.8
* 'arm-privcmd-for-3.8' of git://xenbits.xen.org/people/ianc/linux: xen: arm: implement remap interfaces needed for privcmd mappings. xen: correctly use xen_pfn_t in remap_domain_mfn_range. xen: arm: enable balloon driver xen: balloon: allow PVMMU interfaces to be compiled out xen: privcmd: support autotranslated physmap guests. xen: add pages parameter to xen_remap_domain_mfn_range Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/Kconfig3
-rw-r--r--drivers/xen/Makefile4
-rw-r--r--drivers/xen/balloon.c5
-rw-r--r--drivers/xen/privcmd.c72
4 files changed, 78 insertions, 6 deletions
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 126d8ce591ce..cabfa97f4674 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -206,4 +206,7 @@ config XEN_MCE_LOG
Allow kernel fetching MCE error from Xen platform and
converting it into Linux mcelog format for mcelog tools
+config XEN_HAVE_PVMMU
+ bool
+
endmenu
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 3c397170f39c..3ee2b91ca4e0 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -1,8 +1,8 @@
ifneq ($(CONFIG_ARM),y)
-obj-y += manage.o balloon.o
+obj-y += manage.o
obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug.o
endif
-obj-y += grant-table.o features.o events.o
+obj-y += grant-table.o features.o events.o balloon.o
obj-y += xenbus/
nostackp := $(call cc-option, -fno-stack-protector)
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index d6886d90ccfd..a56776dbe095 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -359,6 +359,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
set_phys_to_machine(pfn, frame_list[i]);
+#ifdef CONFIG_XEN_HAVE_PVMMU
/* Link back into the page tables if not highmem. */
if (xen_pv_domain() && !PageHighMem(page)) {
int ret;
@@ -368,6 +369,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
0);
BUG_ON(ret);
}
+#endif
/* Relinquish the page back to the allocator. */
ClearPageReserved(page);
@@ -416,13 +418,14 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
scrub_page(page);
+#ifdef CONFIG_XEN_HAVE_PVMMU
if (xen_pv_domain() && !PageHighMem(page)) {
ret = HYPERVISOR_update_va_mapping(
(unsigned long)__va(pfn << PAGE_SHIFT),
__pte_ma(0), 0);
BUG_ON(ret);
}
-
+#endif
}
/* Ensure that ballooned highmem pages don't have kmaps. */
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 8adb9cc267f9..b9d08987a5a5 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -33,11 +33,14 @@
#include <xen/features.h>
#include <xen/page.h>
#include <xen/xen-ops.h>
+#include <xen/balloon.h>
#include "privcmd.h"
MODULE_LICENSE("GPL");
+#define PRIV_VMA_LOCKED ((void *)1)
+
#ifndef HAVE_ARCH_PRIVCMD_MMAP
static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma);
#endif
@@ -178,7 +181,7 @@ static int mmap_mfn_range(void *data, void *state)
msg->va & PAGE_MASK,
msg->mfn, msg->npages,
vma->vm_page_prot,
- st->domain);
+ st->domain, NULL);
if (rc < 0)
return rc;
@@ -199,6 +202,10 @@ static long privcmd_ioctl_mmap(void __user *udata)
if (!xen_initial_domain())
return -EPERM;
+ /* We only support privcmd_ioctl_mmap_batch for auto translated. */
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return -ENOSYS;
+
if (copy_from_user(&mmapcmd, udata, sizeof(mmapcmd)))
return -EFAULT;
@@ -246,6 +253,7 @@ struct mmap_batch_state {
domid_t domain;
unsigned long va;
struct vm_area_struct *vma;
+ int index;
/* A tristate:
* 0 for no errors
* 1 if at least one error has happened (and no
@@ -260,14 +268,24 @@ struct mmap_batch_state {
xen_pfn_t __user *user_mfn;
};
+/* auto translated dom0 note: if domU being created is PV, then mfn is
+ * mfn(addr on bus). If it's auto xlated, then mfn is pfn (input to HAP).
+ */
static int mmap_batch_fn(void *data, void *state)
{
xen_pfn_t *mfnp = data;
struct mmap_batch_state *st = state;
+ struct vm_area_struct *vma = st->vma;
+ struct page **pages = vma->vm_private_data;
+ struct page *cur_page = NULL;
int ret;
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ cur_page = pages[st->index++];
+
ret = xen_remap_domain_mfn_range(st->vma, st->va & PAGE_MASK, *mfnp, 1,
- st->vma->vm_page_prot, st->domain);
+ st->vma->vm_page_prot, st->domain,
+ &cur_page);
/* Store error code for second pass. */
*(st->err++) = ret;
@@ -303,6 +321,32 @@ static int mmap_return_errors_v1(void *data, void *state)
return __put_user(*mfnp, st->user_mfn++);
}
+/* Allocate pfns that are then mapped with gmfns from foreign domid. Update
+ * the vma with the page info to use later.
+ * Returns: 0 if success, otherwise -errno
+ */
+static int alloc_empty_pages(struct vm_area_struct *vma, int numpgs)
+{
+ int rc;
+ struct page **pages;
+
+ pages = kcalloc(numpgs, sizeof(pages[0]), GFP_KERNEL);
+ if (pages == NULL)
+ return -ENOMEM;
+
+ rc = alloc_xenballooned_pages(numpgs, pages, 0);
+ if (rc != 0) {
+ pr_warn("%s Could not alloc %d pfns rc:%d\n", __func__,
+ numpgs, rc);
+ kfree(pages);
+ return -ENOMEM;
+ }
+ BUG_ON(vma->vm_private_data != PRIV_VMA_LOCKED);
+ vma->vm_private_data = pages;
+
+ return 0;
+}
+
static struct vm_operations_struct privcmd_vm_ops;
static long privcmd_ioctl_mmap_batch(void __user *udata, int version)
@@ -370,10 +414,18 @@ static long privcmd_ioctl_mmap_batch(void __user *udata, int version)
up_write(&mm->mmap_sem);
goto out;
}
+ if (xen_feature(XENFEAT_auto_translated_physmap)) {
+ ret = alloc_empty_pages(vma, m.num);
+ if (ret < 0) {
+ up_write(&mm->mmap_sem);
+ goto out;
+ }
+ }
state.domain = m.dom;
state.vma = vma;
state.va = m.addr;
+ state.index = 0;
state.global_error = 0;
state.err = err_array;
@@ -438,6 +490,19 @@ static long privcmd_ioctl(struct file *file,
return ret;
}
+static void privcmd_close(struct vm_area_struct *vma)
+{
+ struct page **pages = vma->vm_private_data;
+ int numpgs = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+
+ if (!xen_feature(XENFEAT_auto_translated_physmap || !numpgs || !pages))
+ return;
+
+ xen_unmap_domain_mfn_range(vma, numpgs, pages);
+ free_xenballooned_pages(numpgs, pages);
+ kfree(pages);
+}
+
static int privcmd_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
printk(KERN_DEBUG "privcmd_fault: vma=%p %lx-%lx, pgoff=%lx, uv=%p\n",
@@ -448,6 +513,7 @@ static int privcmd_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
}
static struct vm_operations_struct privcmd_vm_ops = {
+ .close = privcmd_close,
.fault = privcmd_fault
};
@@ -465,7 +531,7 @@ static int privcmd_mmap(struct file *file, struct vm_area_struct *vma)
static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma)
{
- return (xchg(&vma->vm_private_data, (void *)1) == NULL);
+ return !cmpxchg(&vma->vm_private_data, NULL, PRIV_VMA_LOCKED);
}
const struct file_operations xen_privcmd_fops = {