|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3] x86/altp2m: Added xc_altp2m_set_mem_access_multi()
From: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
For the default EPT view we have xc_set_mem_access_multi(), which
is able to set an array of pages to an array of access rights with
a single hypercall. However, this functionality was lacking for the
altp2m subsystem, which could only set page restrictions for one
page at a time. This patch addresses the gap.
Signed-off-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
Signed-off-by: Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>
---
Changed since v2:
* Added support for compat arguments translation
---
tools/libxc/include/xenctrl.h | 3 ++
tools/libxc/xc_altp2m.c | 41 ++++++++++++++++++++++
xen/arch/x86/hvm/hvm.c | 76 +++++++++++++++++++++++++++++++++++++++-
xen/include/Makefile | 1 +
xen/include/public/hvm/hvm_op.h | 30 +++++++++++++---
xen/include/xlat.lst | 1 +
xen/tools/compat-build-header.py | 1 +
7 files changed, 147 insertions(+), 6 deletions(-)
diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 3bcab3c..4e2ce64 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -1971,6 +1971,9 @@ int xc_altp2m_switch_to_view(xc_interface *handle,
domid_t domid,
int xc_altp2m_set_mem_access(xc_interface *handle, domid_t domid,
uint16_t view_id, xen_pfn_t gfn,
xenmem_access_t access);
+int xc_altp2m_set_mem_access_multi(xc_interface *handle, domid_t domid,
+ uint16_t view_id, uint8_t *access,
+ uint64_t *pages, uint32_t nr);
int xc_altp2m_change_gfn(xc_interface *handle, domid_t domid,
uint16_t view_id, xen_pfn_t old_gfn,
xen_pfn_t new_gfn);
diff --git a/tools/libxc/xc_altp2m.c b/tools/libxc/xc_altp2m.c
index 0639632..f202ca1 100644
--- a/tools/libxc/xc_altp2m.c
+++ b/tools/libxc/xc_altp2m.c
@@ -188,6 +188,47 @@ int xc_altp2m_set_mem_access(xc_interface *handle, domid_t
domid,
return rc;
}
+int xc_altp2m_set_mem_access_multi(xc_interface *xch, domid_t domid,
+ uint16_t view_id, uint8_t *access,
+ uint64_t *pages, uint32_t nr)
+{
+ int rc;
+
+ DECLARE_HYPERCALL_BUFFER(xen_hvm_altp2m_op_t, arg);
+ DECLARE_HYPERCALL_BOUNCE(access, nr, XC_HYPERCALL_BUFFER_BOUNCE_IN);
+ DECLARE_HYPERCALL_BOUNCE(pages, nr * sizeof(uint64_t),
+ XC_HYPERCALL_BUFFER_BOUNCE_IN);
+
+ arg = xc_hypercall_buffer_alloc(xch, arg, sizeof(*arg));
+ if ( arg == NULL )
+ return -1;
+
+ arg->version = HVMOP_ALTP2M_INTERFACE_VERSION;
+ arg->cmd = HVMOP_altp2m_set_mem_access_multi;
+ arg->domain = domid;
+ arg->u.set_mem_access_multi.view = view_id;
+ arg->u.set_mem_access_multi.nr = nr;
+
+ if ( xc_hypercall_bounce_pre(xch, pages) ||
+ xc_hypercall_bounce_pre(xch, access) )
+ {
+ PERROR("Could not bounce memory for
HVMOP_altp2m_set_mem_access_multi");
+ return -1;
+ }
+
+ set_xen_guest_handle(arg->u.set_mem_access_multi.pfn_list, pages);
+ set_xen_guest_handle(arg->u.set_mem_access_multi.access_list, access);
+
+ rc = xencall2(xch->xcall, __HYPERVISOR_hvm_op, HVMOP_altp2m,
+ HYPERCALL_BUFFER_AS_ARG(arg));
+
+ xc_hypercall_buffer_free(xch, arg);
+ xc_hypercall_bounce_post(xch, access);
+ xc_hypercall_bounce_post(xch, pages);
+
+ return rc;
+}
+
int xc_altp2m_change_gfn(xc_interface *handle, domid_t domid,
uint16_t view_id, xen_pfn_t old_gfn,
xen_pfn_t new_gfn)
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 205b4cb..1f4358c 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -73,6 +73,8 @@
#include <public/arch-x86/cpuid.h>
#include <asm/cpuid.h>
+#include <compat/hvm/hvm_op.h>
+
bool_t __read_mostly hvm_enabled;
#ifdef DBG_LEVEL_0
@@ -4451,6 +4453,7 @@ static int do_altp2m_op(
case HVMOP_altp2m_destroy_p2m:
case HVMOP_altp2m_switch_p2m:
case HVMOP_altp2m_set_mem_access:
+ case HVMOP_altp2m_set_mem_access_multi:
case HVMOP_altp2m_change_gfn:
break;
default:
@@ -4568,6 +4571,30 @@ static int do_altp2m_op(
a.u.set_mem_access.view);
break;
+ case HVMOP_altp2m_set_mem_access_multi:
+ if ( a.u.set_mem_access_multi.pad ||
+ a.u.set_mem_access_multi.opaque >= a.u.set_mem_access_multi.nr )
+ {
+ rc = -EINVAL;
+ break;
+ }
+ rc = p2m_set_mem_access_multi(d, a.u.set_mem_access_multi.pfn_list,
+ a.u.set_mem_access_multi.access_list,
+ a.u.set_mem_access_multi.nr,
+ a.u.set_mem_access_multi.opaque,
+ MEMOP_CMD_MASK,
+ a.u.set_mem_access_multi.view);
+ if ( rc > 0 )
+ {
+ a.u.set_mem_access_multi.opaque = rc;
+ if ( __copy_to_guest(arg, &a, 1) )
+ rc = -EFAULT;
+ else
+ rc = hypercall_create_continuation(__HYPERVISOR_hvm_op, "lh",
+ HVMOP_altp2m, arg);
+ }
+ break;
+
case HVMOP_altp2m_change_gfn:
if ( a.u.change_gfn.pad1 || a.u.change_gfn.pad2 )
rc = -EINVAL;
@@ -4586,6 +4613,53 @@ static int do_altp2m_op(
return rc;
}
+static int compat_altp2m_op(
+ XEN_GUEST_HANDLE_PARAM(void) arg)
+{
+ struct compat_hvm_altp2m_op a;
+ union
+ {
+ XEN_GUEST_HANDLE_PARAM(void) hnd;
+ struct xen_hvm_altp2m_op *altp2m_op;
+ } nat;
+
+ if ( !hvm_altp2m_supported() )
+ return -EOPNOTSUPP;
+
+ if ( copy_from_guest(&a, arg, 1) )
+ return -EFAULT;
+
+ if ( a.pad1 || a.pad2 ||
+ (a.version != HVMOP_ALTP2M_INTERFACE_VERSION) )
+ return -EINVAL;
+
+ set_xen_guest_handle(nat.hnd, COMPAT_ARG_XLAT_VIRT_BASE);
+
+ switch ( a.cmd )
+ {
+ case HVMOP_altp2m_set_mem_access_multi:
+#define XLAT_hvm_altp2m_set_mem_access_multi_HNDL_pfn_list(_d_, _s_); \
+ guest_from_compat_handle((_d_)->pfn_list, (_s_)->pfn_list)
+#define XLAT_hvm_altp2m_set_mem_access_multi_HNDL_access_list(_d_, _s_); \
+ guest_from_compat_handle((_d_)->access_list, (_s_)->access_list)
+
XLAT_hvm_altp2m_set_mem_access_multi(&nat.altp2m_op->u.set_mem_access_multi,
+ &a.u.set_mem_access_multi);
+#undef XLAT_hvm_altp2m_set_mem_access_multi_HNDL_pfn_list
+#undef XLAT_hvm_altp2m_set_mem_access_multi_HNDL_access_list
+ break;
+ default:
+ return do_altp2m_op(arg);
+ }
+
+ nat.altp2m_op->version = a.version;
+ nat.altp2m_op->cmd = a.cmd;
+ nat.altp2m_op->domain = a.domain;
+ nat.altp2m_op->pad1 = a.pad1;
+ nat.altp2m_op->pad2 = a.pad2;
+
+ return do_altp2m_op(nat.hnd);
+}
+
static int hvmop_get_mem_type(
XEN_GUEST_HANDLE_PARAM(xen_hvm_get_mem_type_t) arg)
{
@@ -4733,7 +4807,7 @@ long do_hvm_op(unsigned long op,
XEN_GUEST_HANDLE_PARAM(void) arg)
break;
case HVMOP_altp2m:
- rc = do_altp2m_op(arg);
+ rc = ( current->hcall_compat ) ? compat_altp2m_op(arg) :
do_altp2m_op(arg);
break;
default:
diff --git a/xen/include/Makefile b/xen/include/Makefile
index c90fdee..814b0a8 100644
--- a/xen/include/Makefile
+++ b/xen/include/Makefile
@@ -28,6 +28,7 @@ headers-$(CONFIG_X86) += compat/arch-x86/xen.h
headers-$(CONFIG_X86) += compat/arch-x86/xen-$(compat-arch-y).h
headers-$(CONFIG_X86) += compat/hvm/hvm_vcpu.h
headers-$(CONFIG_X86) += compat/hvm/dm_op.h
+headers-$(CONFIG_X86) += compat/hvm/hvm_op.h
headers-y += compat/arch-$(compat-arch-y).h compat/pmu.h
compat/xlat.h
headers-$(CONFIG_FLASK) += compat/xsm/flask_op.h
diff --git a/xen/include/public/hvm/hvm_op.h b/xen/include/public/hvm/hvm_op.h
index 0bdafdf..bedce71 100644
--- a/xen/include/public/hvm/hvm_op.h
+++ b/xen/include/public/hvm/hvm_op.h
@@ -237,6 +237,23 @@ struct xen_hvm_altp2m_set_mem_access {
typedef struct xen_hvm_altp2m_set_mem_access xen_hvm_altp2m_set_mem_access_t;
DEFINE_XEN_GUEST_HANDLE(xen_hvm_altp2m_set_mem_access_t);
+struct xen_hvm_altp2m_set_mem_access_multi {
+ /* view */
+ uint16_t view;
+ uint16_t pad;
+ /* Number of pages */
+ uint32_t nr;
+ /* Used for continuation purposes */
+ uint64_t opaque;
+ /* List of pfns to set access for */
+ XEN_GUEST_HANDLE(const_uint64) pfn_list;
+ /* Corresponding list of access settings for pfn_list */
+ XEN_GUEST_HANDLE(const_uint8) access_list;
+};
+typedef struct xen_hvm_altp2m_set_mem_access_multi
+ xen_hvm_altp2m_set_mem_access_multi_t;
+DEFINE_XEN_GUEST_HANDLE(xen_hvm_altp2m_set_mem_access_multi_t);
+
struct xen_hvm_altp2m_change_gfn {
/* view */
uint16_t view;
@@ -268,15 +285,18 @@ struct xen_hvm_altp2m_op {
#define HVMOP_altp2m_set_mem_access 7
/* Change a p2m entry to have a different gfn->mfn mapping */
#define HVMOP_altp2m_change_gfn 8
+/* Set access for an array of pages */
+#define HVMOP_altp2m_set_mem_access_multi 9
domid_t domain;
uint16_t pad1;
uint32_t pad2;
union {
- struct xen_hvm_altp2m_domain_state domain_state;
- struct xen_hvm_altp2m_vcpu_enable_notify enable_notify;
- struct xen_hvm_altp2m_view view;
- struct xen_hvm_altp2m_set_mem_access set_mem_access;
- struct xen_hvm_altp2m_change_gfn change_gfn;
+ struct xen_hvm_altp2m_domain_state domain_state;
+ struct xen_hvm_altp2m_vcpu_enable_notify enable_notify;
+ struct xen_hvm_altp2m_view view;
+ struct xen_hvm_altp2m_set_mem_access set_mem_access;
+ struct xen_hvm_altp2m_change_gfn change_gfn;
+ struct xen_hvm_altp2m_set_mem_access_multi set_mem_access_multi;
uint8_t pad[64];
} u;
};
diff --git a/xen/include/xlat.lst b/xen/include/xlat.lst
index 0f17000..750d199 100644
--- a/xen/include/xlat.lst
+++ b/xen/include/xlat.lst
@@ -73,6 +73,7 @@
? vcpu_hvm_context hvm/hvm_vcpu.h
? vcpu_hvm_x86_32 hvm/hvm_vcpu.h
? vcpu_hvm_x86_64 hvm/hvm_vcpu.h
+! hvm_altp2m_set_mem_access_multi hvm/hvm_op.h
? kexec_exec kexec.h
! kexec_image kexec.h
! kexec_range kexec.h
diff --git a/xen/tools/compat-build-header.py b/xen/tools/compat-build-header.py
index 32421b6..12b7a6c 100755
--- a/xen/tools/compat-build-header.py
+++ b/xen/tools/compat-build-header.py
@@ -16,6 +16,7 @@ pats = [
[ r"(8|16|32|64)_compat_t([^\w]|$)", r"\1_t\2" ],
[ r"(^|[^\w])xen_?(\w*)_compat_t([^\w]|$$)", r"\1compat_\2_t\3" ],
[ r"(^|[^\w])XEN_?", r"\1COMPAT_" ],
+ [ r"(^|[^\w])HVMMEM_?", r"\1COMPAT_HVMMEM_" ],
[ r"(^|[^\w])Xen_?", r"\1Compat_" ],
[ r"(^|[^\w])long([^\w]|$$)", r"\1int\2" ]
];
--
2.7.4
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel
|
 |
Lists.xenproject.org is hosted with RackSpace, monitoring our |