This patch removes the need for handling HVMOP restarts, so that
infrastructure is removed.
NOTE: This patch also modifies the type of the 'nr' argument of
xc_hvm_set_mem_type() from uint64_t to uint32_t. In practice the
value passed was always truncated to 32 bits.
Suggested-by: Jan Beulich <jbeul...@suse.com>
Signed-off-by: Paul Durrant <paul.durr...@citrix.com>
Reviewed-by: Jan Beulich <jbeul...@suse.com>
Acked-by: Wei Liu <wei.l...@citrix.com>
Acked-by: Daniel De Graaf <dgde...@tycho.nsa.gov>
Reviewed-by: Andrew Cooper <andrew.coop...@citrix.com>
---
Cc: Ian Jackson <ian.jack...@eu.citrix.com>
v6:
- Pass by reference as requested by Andy.
- Modify const_op appropriately.
v4:
- Added initializers as requested by Jan.
v3:
- Addressed more comments from Jan.
v2:
- Addressed several comments from Jan.
---
tools/libxc/include/xenctrl.h | 2 +-
tools/libxc/xc_misc.c | 29 +++-----
xen/arch/x86/hvm/dm.c | 91 ++++++++++++++++++++++++
xen/arch/x86/hvm/hvm.c | 136 +-----------------------------------
xen/include/public/hvm/dm_op.h | 22 ++++++
xen/include/public/hvm/hvm_op.h | 20 ------
xen/xsm/flask/policy/access_vectors | 2 +-
7 files changed, 126 insertions(+), 176 deletions(-)
diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 5ff53ed..6648679 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -1634,7 +1634,7 @@ int xc_hvm_modified_memory(
* Allowed types are HVMMEM_ram_rw, HVMMEM_ram_ro, HVMMEM_mmio_dm
*/
int xc_hvm_set_mem_type(
- xc_interface *xch, domid_t dom, hvmmem_type_t memtype, uint64_t first_pfn,
uint64_t nr);
+ xc_interface *xch, domid_t dom, hvmmem_type_t memtype, uint64_t first_pfn,
uint32_t nr);
/*
* Injects a hardware/software CPU trap, to take effect the next time the HVM
diff --git a/tools/libxc/xc_misc.c b/tools/libxc/xc_misc.c
index 597df99..5b06d6b 100644
--- a/tools/libxc/xc_misc.c
+++ b/tools/libxc/xc_misc.c
@@ -590,30 +590,21 @@ int xc_hvm_modified_memory(
}
int xc_hvm_set_mem_type(
- xc_interface *xch, domid_t dom, hvmmem_type_t mem_type, uint64_t
first_pfn, uint64_t nr)
+ xc_interface *xch, domid_t dom, hvmmem_type_t mem_type, uint64_t
first_pfn, uint32_t nr)
{
- DECLARE_HYPERCALL_BUFFER(struct xen_hvm_set_mem_type, arg);
- int rc;
-
- arg = xc_hypercall_buffer_alloc(xch, arg, sizeof(*arg));
- if ( arg == NULL )
- {
- PERROR("Could not allocate memory for xc_hvm_set_mem_type hypercall");
- return -1;
- }
+ struct xen_dm_op op;
+ struct xen_dm_op_set_mem_type *data;
- arg->domid = dom;
- arg->hvmmem_type = mem_type;
- arg->first_pfn = first_pfn;
- arg->nr = nr;
+ memset(&op, 0, sizeof(op));
- rc = xencall2(xch->xcall, __HYPERVISOR_hvm_op,
- HVMOP_set_mem_type,
- HYPERCALL_BUFFER_AS_ARG(arg));
+ op.op = XEN_DMOP_set_mem_type;
+ data = &op.u.set_mem_type;
- xc_hypercall_buffer_free(xch, arg);
+ data->mem_type = mem_type;
+ data->first_pfn = first_pfn;
+ data->nr = nr;
- return rc;
+ return do_dm_op(xch, dom, 1, &op, sizeof(op));
}
int xc_hvm_inject_trap(
diff --git a/xen/arch/x86/hvm/dm.c b/xen/arch/x86/hvm/dm.c
index e28bda4..cc68ba9 100644
--- a/xen/arch/x86/hvm/dm.c
+++ b/xen/arch/x86/hvm/dm.c
@@ -161,6 +161,82 @@ static int modified_memory(struct domain *d,
return rc;
}
+static bool allow_p2m_type_change(p2m_type_t old, p2m_type_t new)
+{
+ return p2m_is_ram(old) ||
+ (p2m_is_hole(old) && new == p2m_mmio_dm) ||
+ (old == p2m_ioreq_server && new == p2m_ram_rw);
+}
+
+static int set_mem_type(struct domain *d,
+ struct xen_dm_op_set_mem_type *data)
+{
+ xen_pfn_t last_pfn = data->first_pfn + data->nr - 1;
+ unsigned int iter = 0;
+ int rc = 0;
+
+ /* Interface types to internal p2m types */
+ static const p2m_type_t memtype[] = {
+ [HVMMEM_ram_rw] = p2m_ram_rw,
+ [HVMMEM_ram_ro] = p2m_ram_ro,
+ [HVMMEM_mmio_dm] = p2m_mmio_dm,
+ [HVMMEM_unused] = p2m_invalid,
+ [HVMMEM_ioreq_server] = p2m_ioreq_server,
+ };
+
+ if ( (data->first_pfn > last_pfn) ||
+ (last_pfn > domain_get_maximum_gpfn(d)) )
+ return -EINVAL;
+
+ if ( data->mem_type >= ARRAY_SIZE(memtype) ||
+ unlikely(data->mem_type == HVMMEM_unused) )
+ return -EINVAL;
+
+ while ( iter < data->nr )
+ {
+ unsigned long pfn = data->first_pfn + iter;
+ p2m_type_t t;
+
+ get_gfn_unshare(d, pfn, &t);
+ if ( p2m_is_paging(t) )
+ {
+ put_gfn(d, pfn);
+ p2m_mem_paging_populate(d, pfn);
+ return -EAGAIN;
+ }
+
+ if ( p2m_is_shared(t) )
+ rc = -EAGAIN;
+ else if ( !allow_p2m_type_change(t, memtype[data->mem_type]) )
+ rc = -EINVAL;
+ else
+ rc = p2m_change_type_one(d, pfn, t, memtype[data->mem_type]);
+
+ put_gfn(d, pfn);
+
+ if ( rc )
+ break;
+
+ iter++;
+
+ /*
+ * Check for continuation every 256th iteration and if the
+ * iteration is not the last.
+ */
+ if ( (iter < data->nr) && ((iter & 0xff) == 0) &&
+ hypercall_preempt_check() )
+ {
+ data->first_pfn += iter;
+ data->nr -= iter;
+
+ rc = -ERESTART;
+ break;
+ }
+ }
+
+ return rc;
+}
+
static int dm_op(domid_t domid,
unsigned int nr_bufs,
xen_dm_op_buf_t bufs[])
@@ -342,6 +418,21 @@ static int dm_op(domid_t domid,
break;
}
+ case XEN_DMOP_set_mem_type:
+ {
+ struct xen_dm_op_set_mem_type *data =
+ &op.u.set_mem_type;
+
+ const_op = false;
+
+ rc = -EINVAL;
+ if ( data->pad )
+ break;
+
+ rc = set_mem_type(d, data);
+ break;
+ }
+
default:
rc = -EOPNOTSUPP;
break;
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index b29c042..5d47923 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -4846,132 +4846,11 @@ static int hvmop_get_mem_type(
return rc;
}
-/*
- * Note that this value is effectively part of the ABI, even if we don't need
- * to make it a formal part of it: A guest suspended for migration in the
- * middle of a continuation would fail to work if resumed on a hypervisor
- * using a different value.
- */
-#define HVMOP_op_mask 0xff
-
-static bool_t hvm_allow_p2m_type_change(p2m_type_t old, p2m_type_t new)
-{
- if ( p2m_is_ram(old) ||
- (p2m_is_hole(old) && new == p2m_mmio_dm) ||
- (old == p2m_ioreq_server && new == p2m_ram_rw) )
- return 1;
-
- return 0;
-}
-
-static int hvmop_set_mem_type(
- XEN_GUEST_HANDLE_PARAM(xen_hvm_set_mem_type_t) arg,
- unsigned long *iter)
-{
- unsigned long start_iter = *iter;
- struct xen_hvm_set_mem_type a;
- struct domain *d;
- int rc;
-
- /* Interface types to internal p2m types */
- static const p2m_type_t memtype[] = {
- [HVMMEM_ram_rw] = p2m_ram_rw,
- [HVMMEM_ram_ro] = p2m_ram_ro,
- [HVMMEM_mmio_dm] = p2m_mmio_dm,
- [HVMMEM_unused] = p2m_invalid,
- [HVMMEM_ioreq_server] = p2m_ioreq_server
- };
-
- if ( copy_from_guest(&a, arg, 1) )
- return -EFAULT;
-
- rc = rcu_lock_remote_domain_by_id(a.domid, &d);
- if ( rc != 0 )
- return rc;
-
- rc = -EINVAL;
- if ( !is_hvm_domain(d) )
- goto out;
-
- rc = xsm_hvm_control(XSM_DM_PRIV, d, HVMOP_set_mem_type);
- if ( rc )
- goto out;
-
- rc = -EINVAL;
- if ( a.nr < start_iter ||
- ((a.first_pfn + a.nr - 1) < a.first_pfn) ||
- ((a.first_pfn + a.nr - 1) > domain_get_maximum_gpfn(d)) )
- goto out;
-
- if ( a.hvmmem_type >= ARRAY_SIZE(memtype) ||
- unlikely(a.hvmmem_type == HVMMEM_unused) )
- goto out;
-
- while ( a.nr > start_iter )
- {
- unsigned long pfn = a.first_pfn + start_iter;
- p2m_type_t t;
-
- get_gfn_unshare(d, pfn, &t);
- if ( p2m_is_paging(t) )
- {
- put_gfn(d, pfn);
- p2m_mem_paging_populate(d, pfn);
- rc = -EAGAIN;
- goto out;
- }
- if ( p2m_is_shared(t) )
- {
- put_gfn(d, pfn);
- rc = -EAGAIN;
- goto out;
- }
- if ( !hvm_allow_p2m_type_change(t, memtype[a.hvmmem_type]) )
- {
- put_gfn(d, pfn);
- goto out;
- }
-
- rc = p2m_change_type_one(d, pfn, t, memtype[a.hvmmem_type]);
- put_gfn(d, pfn);
-
- if ( rc )
- goto out;
-
- /* Check for continuation if it's not the last interation */
- if ( a.nr > ++start_iter && !(start_iter & HVMOP_op_mask) &&
- hypercall_preempt_check() )
- {
- rc = -ERESTART;
- goto out;
- }
- }
- rc = 0;
-
- out:
- rcu_unlock_domain(d);
- *iter = start_iter;
-
- return rc;
-}
-
long do_hvm_op(unsigned long op, XEN_GUEST_HANDLE_PARAM(void) arg)
{
- unsigned long start_iter, mask;
long rc = 0;
- switch ( op & HVMOP_op_mask )
- {
- default:
- mask = ~0UL;
- break;
- case HVMOP_set_mem_type:
- mask = HVMOP_op_mask;
- break;
- }
-
- start_iter = op & ~mask;
- switch ( op &= mask )
+ switch ( op )
{
case HVMOP_set_evtchn_upcall_vector:
rc = hvmop_set_evtchn_upcall_vector(
@@ -5002,12 +4881,6 @@ long do_hvm_op(unsigned long op,
XEN_GUEST_HANDLE_PARAM(void) arg)
guest_handle_cast(arg, xen_hvm_get_mem_type_t));
break;
- case HVMOP_set_mem_type:
- rc = hvmop_set_mem_type(
- guest_handle_cast(arg, xen_hvm_set_mem_type_t),
- &start_iter);
- break;
-
case HVMOP_pagetable_dying:
{
struct xen_hvm_pagetable_dying a;
@@ -5116,13 +4989,6 @@ long do_hvm_op(unsigned long op,
XEN_GUEST_HANDLE_PARAM(void) arg)
}
}
- if ( rc == -ERESTART )
- {
- ASSERT(!(start_iter & mask));
- rc = hypercall_create_continuation(__HYPERVISOR_hvm_op, "lh",
- op | start_iter, arg);
- }
-
return rc;
}
diff --git a/xen/include/public/hvm/dm_op.h b/xen/include/public/hvm/dm_op.h
index fd095cc..06c67b8 100644
--- a/xen/include/public/hvm/dm_op.h
+++ b/xen/include/public/hvm/dm_op.h
@@ -251,6 +251,27 @@ struct xen_dm_op_modified_memory {
uint64_aligned_t first_pfn;
};
+/*
+ * XEN_DMOP_set_mem_type: Notify that a region of memory is to be treated
+ * in a specific way. (See definition of
+ * hvmmem_type_t).
+ *
+ * NOTE: In the event of a continuation (return code -ERESTART), the
+ * @first_pfn is set to the value of the pfn of the remaining
+ * region and @nr reduced to the size of the remaining region.
+ */
+#define XEN_DMOP_set_mem_type 12
+
+struct xen_dm_op_set_mem_type {
+ /* IN - number of contiguous pages */
+ uint32_t nr;
+ /* IN - new hvmmem_type_t of region */
+ uint16_t mem_type;
+ uint16_t pad;
+ /* IN - first pfn in region */
+ uint64_aligned_t first_pfn;
+};
+
struct xen_dm_op {
uint32_t op;
uint32_t pad;
@@ -266,6 +287,7 @@ struct xen_dm_op {
struct xen_dm_op_set_isa_irq_level set_isa_irq_level;
struct xen_dm_op_set_pci_link_route set_pci_link_route;
struct xen_dm_op_modified_memory modified_memory;
+ struct xen_dm_op_set_mem_type set_mem_type;
} u;
};
diff --git a/xen/include/public/hvm/hvm_op.h b/xen/include/public/hvm/hvm_op.h
index 76e1b78..d7e2f12 100644
--- a/xen/include/public/hvm/hvm_op.h
+++ b/xen/include/public/hvm/hvm_op.h
@@ -96,26 +96,6 @@ typedef enum {
HVMMEM_ioreq_server
} hvmmem_type_t;
-/* Following tools-only interfaces may change in future. */
-#if defined(__XEN__) || defined(__XEN_TOOLS__)
-
-#define HVMOP_set_mem_type 8
-/* Notify that a region of memory is to be treated in a specific way. */
-struct xen_hvm_set_mem_type {
- /* Domain to be updated. */
- domid_t domid;
- /* Memory type */
- uint16_t hvmmem_type;
- /* Number of pages. */
- uint32_t nr;
- /* First pfn. */
- uint64_aligned_t first_pfn;
-};
-typedef struct xen_hvm_set_mem_type xen_hvm_set_mem_type_t;
-DEFINE_XEN_GUEST_HANDLE(xen_hvm_set_mem_type_t);
-
-#endif /* defined(__XEN__) || defined(__XEN_TOOLS__) */
-
/* Hint from PV drivers for pagetable destruction. */
#define HVMOP_pagetable_dying 9
struct xen_hvm_pagetable_dying {
diff --git a/xen/xsm/flask/policy/access_vectors
b/xen/xsm/flask/policy/access_vectors
index 361e7aa..381f659 100644
--- a/xen/xsm/flask/policy/access_vectors
+++ b/xen/xsm/flask/policy/access_vectors
@@ -262,7 +262,7 @@ class hvm
bind_irq
# XEN_DOMCTL_pin_mem_cacheattr
cacheattr
-# HVMOP_get_mem_type, HVMOP_set_mem_type,
+# HVMOP_get_mem_type,
# HVMOP_set_mem_access, HVMOP_get_mem_access, HVMOP_pagetable_dying,
# HVMOP_inject_trap
hvmctl
--
2.1.4
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