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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen staging] xen/hvm: Fix handling of obsolete HVM_PARAMs
commit ea53652d78cddd36d99f53a87591910da0c9b1ef
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Feb 6 12:40:50 2020 +0000
Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Fri Feb 21 15:21:40 2020 +0000
xen/hvm: Fix handling of obsolete HVM_PARAMs
The local xc_hvm_param_deprecated_check() in libxc tries to guess Xen's
behaviour for the MEMORY_EVENT params, but is wrong for the get side, where
Xen would return 0 (which is also a bug). Delete the helper.
In Xen, perform the checks in hvm_allow_set_param(), rather than
hvm_set_param(), and actually implement checks on the get side so the
hypercall doesn't return successfully with 0 as an answer.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Wei Liu <wl@xxxxxxx>
---
tools/libxc/xc_domain.c | 28 ++--------------------------
xen/arch/x86/hvm/hvm.c | 25 ++++++++++++++-----------
xen/include/public/hvm/params.h | 18 ++++++++----------
3 files changed, 24 insertions(+), 47 deletions(-)
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index e544218d2e..71829c2bce 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -1441,31 +1441,10 @@ int xc_domain_send_trigger(xc_interface *xch,
return do_domctl(xch, &domctl);
}
-static inline int xc_hvm_param_deprecated_check(uint32_t param)
-{
- switch ( param )
- {
- case HVM_PARAM_MEMORY_EVENT_CR0:
- case HVM_PARAM_MEMORY_EVENT_CR3:
- case HVM_PARAM_MEMORY_EVENT_CR4:
- case HVM_PARAM_MEMORY_EVENT_INT3:
- case HVM_PARAM_MEMORY_EVENT_SINGLE_STEP:
- case HVM_PARAM_MEMORY_EVENT_MSR:
- return -EOPNOTSUPP;
- default:
- break;
- };
-
- return 0;
-}
-
int xc_hvm_param_set(xc_interface *handle, uint32_t dom, uint32_t param,
uint64_t value)
{
DECLARE_HYPERCALL_BUFFER(xen_hvm_param_t, arg);
- int rc = xc_hvm_param_deprecated_check(param);
-
- if ( rc )
- return rc;
+ int rc;
arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
if ( arg == NULL )
@@ -1484,10 +1463,7 @@ int xc_hvm_param_set(xc_interface *handle, uint32_t dom,
uint32_t param, uint64_
int xc_hvm_param_get(xc_interface *handle, uint32_t dom, uint32_t param,
uint64_t *value)
{
DECLARE_HYPERCALL_BUFFER(xen_hvm_param_t, arg);
- int rc = xc_hvm_param_deprecated_check(param);
-
- if ( rc )
- return rc;
+ int rc;
arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
if ( arg == NULL )
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 00a9e70b7c..93795dab92 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -4105,8 +4105,14 @@ static int hvm_allow_set_param(struct domain *d,
break;
/* The following parameters are deprecated. */
case HVM_PARAM_DM_DOMAIN:
+ case HVM_PARAM_MEMORY_EVENT_CR0:
+ case HVM_PARAM_MEMORY_EVENT_CR3:
+ case HVM_PARAM_MEMORY_EVENT_CR4:
+ case HVM_PARAM_MEMORY_EVENT_INT3:
+ case HVM_PARAM_MEMORY_EVENT_SINGLE_STEP:
case HVM_PARAM_BUFIOREQ_EVTCHN:
- rc = -EPERM;
+ case HVM_PARAM_MEMORY_EVENT_MSR:
+ rc = -EINVAL;
break;
/*
* The following parameters must not be set by the guest
@@ -4221,15 +4227,6 @@ static int hvm_set_param(struct domain *d, uint32_t
index, uint64_t value)
case HVM_PARAM_ACPI_IOPORTS_LOCATION:
rc = pmtimer_change_ioport(d, value);
break;
- case HVM_PARAM_MEMORY_EVENT_CR0:
- case HVM_PARAM_MEMORY_EVENT_CR3:
- case HVM_PARAM_MEMORY_EVENT_CR4:
- case HVM_PARAM_MEMORY_EVENT_INT3:
- case HVM_PARAM_MEMORY_EVENT_SINGLE_STEP:
- case HVM_PARAM_MEMORY_EVENT_MSR:
- /* Deprecated */
- rc = -EOPNOTSUPP;
- break;
case HVM_PARAM_NESTEDHVM:
rc = xsm_hvm_param_nested(XSM_PRIV, d);
if ( rc )
@@ -4411,8 +4408,14 @@ static int hvm_allow_get_param(struct domain *d,
break;
/* The following parameters are deprecated. */
case HVM_PARAM_DM_DOMAIN:
+ case HVM_PARAM_MEMORY_EVENT_CR0:
+ case HVM_PARAM_MEMORY_EVENT_CR3:
+ case HVM_PARAM_MEMORY_EVENT_CR4:
+ case HVM_PARAM_MEMORY_EVENT_INT3:
+ case HVM_PARAM_MEMORY_EVENT_SINGLE_STEP:
case HVM_PARAM_BUFIOREQ_EVTCHN:
- rc = -ENODATA;
+ case HVM_PARAM_MEMORY_EVENT_MSR:
+ rc = -EINVAL;
break;
/* The remaining parameters should not be read by the guest. */
default:
diff --git a/xen/include/public/hvm/params.h b/xen/include/public/hvm/params.h
index 36832e4b94..68293e314e 100644
--- a/xen/include/public/hvm/params.h
+++ b/xen/include/public/hvm/params.h
@@ -28,8 +28,14 @@
/* These parameters are deprecated and their meaning is undefined. */
#if defined(__XEN__) || defined(__XEN_TOOLS__)
-#define HVM_PARAM_DM_DOMAIN 13
-#define HVM_PARAM_BUFIOREQ_EVTCHN 26
+#define HVM_PARAM_DM_DOMAIN 13
+#define HVM_PARAM_MEMORY_EVENT_CR0 20
+#define HVM_PARAM_MEMORY_EVENT_CR3 21
+#define HVM_PARAM_MEMORY_EVENT_CR4 22
+#define HVM_PARAM_MEMORY_EVENT_INT3 23
+#define HVM_PARAM_MEMORY_EVENT_SINGLE_STEP 25
+#define HVM_PARAM_BUFIOREQ_EVTCHN 26
+#define HVM_PARAM_MEMORY_EVENT_MSR 30
#endif /* defined(__XEN__) || defined(__XEN_TOOLS__) */
@@ -227,14 +233,6 @@
*/
#define HVM_PARAM_ACPI_IOPORTS_LOCATION 19
-/* Deprecated */
-#define HVM_PARAM_MEMORY_EVENT_CR0 20
-#define HVM_PARAM_MEMORY_EVENT_CR3 21
-#define HVM_PARAM_MEMORY_EVENT_CR4 22
-#define HVM_PARAM_MEMORY_EVENT_INT3 23
-#define HVM_PARAM_MEMORY_EVENT_SINGLE_STEP 25
-#define HVM_PARAM_MEMORY_EVENT_MSR 30
-
/* Boolean: Enable nestedhvm (hvm only) */
#define HVM_PARAM_NESTEDHVM 24
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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