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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 1/3] x86/monitor: add get_capabilities to monitor_op domctl
Add option to monitor_op domctl to determine the monitor capabilities of the
system.
Signed-off-by: Tamas K Lengyel <tlengyel@xxxxxxxxxxx>
---
v4: add inline function wrapper for is_singlestep_supported to hvm.h
v3: move is_singlestep_supported into vmx
sanity check capabilities for each monitor_op enable/disable
fix comment typo
v2: skipped
---
tools/libxc/include/xenctrl.h | 6 ++++++
tools/libxc/xc_monitor.c | 21 +++++++++++++++++++++
xen/arch/x86/hvm/vmx/vmx.c | 6 ++++++
xen/arch/x86/monitor.c | 33 +++++++++++++++++++++++++++++++--
xen/common/domctl.c | 2 ++
xen/include/asm-x86/hvm/hvm.h | 6 ++++++
xen/include/public/domctl.h | 18 +++++++++++++++---
7 files changed, 87 insertions(+), 5 deletions(-)
diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 71539a7..4fe347b 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -2364,6 +2364,12 @@ int xc_mem_access_disable_emulate(xc_interface *xch,
domid_t domain_id);
void *xc_monitor_enable(xc_interface *xch, domid_t domain_id, uint32_t *port);
int xc_monitor_disable(xc_interface *xch, domid_t domain_id);
int xc_monitor_resume(xc_interface *xch, domid_t domain_id);
+/*
+ * Get a bitmap of supported monitor events in the form
+ * (1 << XEN_DOMCTL_MONITOR_EVENT_*).
+ */
+int xc_monitor_get_capabilities(xc_interface *xch, domid_t domain_id,
+ uint32_t *capabilities);
int xc_monitor_write_ctrlreg(xc_interface *xch, domid_t domain_id,
uint16_t index, bool enable, bool sync,
bool onchangeonly);
diff --git a/tools/libxc/xc_monitor.c b/tools/libxc/xc_monitor.c
index 63013de..3221bdd 100644
--- a/tools/libxc/xc_monitor.c
+++ b/tools/libxc/xc_monitor.c
@@ -45,6 +45,27 @@ int xc_monitor_resume(xc_interface *xch, domid_t domain_id)
NULL);
}
+int xc_monitor_get_capabilities(xc_interface *xch, domid_t domain_id,
+ uint32_t *capabilities)
+{
+ int rc;
+ DECLARE_DOMCTL;
+
+ if ( !capabilities )
+ return -EINVAL;
+
+ domctl.cmd = XEN_DOMCTL_monitor_op;
+ domctl.domain = domain_id;
+ domctl.u.monitor_op.op = XEN_DOMCTL_MONITOR_OP_GET_CAPABILITIES;
+
+ rc = do_domctl(xch, &domctl);
+ if ( rc )
+ return rc;
+
+ *capabilities = domctl.u.monitor_op.event;
+ return 0;
+}
+
int xc_monitor_write_ctrlreg(xc_interface *xch, domid_t domain_id,
uint16_t index, bool enable, bool sync,
bool onchangeonly)
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index e0e9e75..1f7f9e5 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -1763,6 +1763,11 @@ static void vmx_enable_msr_exit_interception(struct
domain *d)
MSR_TYPE_W);
}
+static bool_t vmx_is_singlestep_supported(void)
+{
+ return cpu_has_monitor_trap_flag;
+}
+
static struct hvm_function_table __initdata vmx_function_table = {
.name = "VMX",
.cpu_up_prepare = vmx_cpu_up_prepare,
@@ -1820,6 +1825,7 @@ static struct hvm_function_table __initdata
vmx_function_table = {
.nhvm_hap_walk_L1_p2m = nvmx_hap_walk_L1_p2m,
.hypervisor_cpuid_leaf = vmx_hypervisor_cpuid_leaf,
.enable_msr_exit_interception = vmx_enable_msr_exit_interception,
+ .is_singlestep_supported = vmx_is_singlestep_supported,
};
const struct hvm_function_table * __init start_vmx(void)
diff --git a/xen/arch/x86/monitor.c b/xen/arch/x86/monitor.c
index 896acf7..590a45d 100644
--- a/xen/arch/x86/monitor.c
+++ b/xen/arch/x86/monitor.c
@@ -42,10 +42,29 @@ int status_check(struct xen_domctl_monitor_op *mop, bool_t
status)
return 0;
}
+static inline uint32_t get_capabilities(struct domain *d)
+{
+ uint32_t capabilities = 0;
+
+ if ( !is_hvm_domain(d) || !cpu_has_vmx )
+ return capabilities;
+
+ capabilities = (1 << XEN_DOMCTL_MONITOR_EVENT_WRITE_CTRLREG) |
+ (1 << XEN_DOMCTL_MONITOR_EVENT_MOV_TO_MSR) |
+ (1 << XEN_DOMCTL_MONITOR_EVENT_SOFTWARE_BREAKPOINT);
+
+ /* Since we know this is on VMX, we can just call the hvm func */
+ if ( hvm_is_singlestep_supported() )
+ capabilities |= (1 << XEN_DOMCTL_MONITOR_EVENT_SINGLESTEP);
+
+ return capabilities;
+}
+
int monitor_domctl(struct domain *d, struct xen_domctl_monitor_op *mop)
{
int rc;
struct arch_domain *ad = &d->arch;
+ uint32_t capabilities = get_capabilities(d);
rc = xsm_vm_event_control(XSM_PRIV, d, mop->op, mop->event);
if ( rc )
@@ -55,8 +74,12 @@ int monitor_domctl(struct domain *d, struct
xen_domctl_monitor_op *mop)
* At the moment only Intel HVM domains are supported. However, event
* delivery could be extended to AMD and PV domains.
*/
- if ( !is_hvm_domain(d) || !cpu_has_vmx )
- return -EOPNOTSUPP;
+
+ if ( mop->op == XEN_DOMCTL_MONITOR_OP_GET_CAPABILITIES )
+ {
+ mop->event = capabilities;
+ return 0;
+ }
/*
* Sanity check
@@ -65,6 +88,12 @@ int monitor_domctl(struct domain *d, struct
xen_domctl_monitor_op *mop)
mop->op != XEN_DOMCTL_MONITOR_OP_DISABLE )
return -EOPNOTSUPP;
+ /*
+ * Check if event type is available.
+ */
+ if ( !( capabilities & (1 << mop->event) ) )
+ return -EOPNOTSUPP;
+
switch ( mop->event )
{
case XEN_DOMCTL_MONITOR_EVENT_WRITE_CTRLREG:
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index a06f15c..7f959f3 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -1167,6 +1167,8 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t)
u_domctl)
break;
ret = monitor_domctl(d, &op->u.monitor_op);
+ if ( !ret )
+ copyback = 1;
break;
default:
diff --git a/xen/include/asm-x86/hvm/hvm.h b/xen/include/asm-x86/hvm/hvm.h
index 1d1fd35..c9a7184 100644
--- a/xen/include/asm-x86/hvm/hvm.h
+++ b/xen/include/asm-x86/hvm/hvm.h
@@ -202,6 +202,7 @@ struct hvm_function_table {
uint32_t *ecx, uint32_t *edx);
void (*enable_msr_exit_interception)(struct domain *d);
+ bool_t (*is_singlestep_supported)(void);
};
extern struct hvm_function_table hvm_funcs;
@@ -510,6 +511,11 @@ static inline enum hvm_intblk
nhvm_interrupt_blocked(struct vcpu *v)
return hvm_funcs.nhvm_intr_blocked(v);
}
+static inline bool_t hvm_is_singlestep_supported(void)
+{
+ return (hvm_funcs.is_singlestep_supported &&
+ hvm_funcs.is_singlestep_supported());
+}
#ifndef NDEBUG
/* Permit use of the Forced Emulation Prefix in HVM guests */
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 2128171..8b1d6b4 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -994,12 +994,16 @@ DEFINE_XEN_GUEST_HANDLE(xen_domctl_psr_cmt_op_t);
* via the ring buffer "MONITOR". The ring has to be first enabled
* with the domctl XEN_DOMCTL_VM_EVENT_OP_MONITOR.
*
+ * GET_CAPABILITIES can be used to determine which of these features is
+ * available on a given platform.
+ *
* NOTICE: mem_access events are also delivered via the "MONITOR" ring buffer;
* however, enabling/disabling those events is performed with the use of
* memory_op hypercalls!
*/
-#define XEN_DOMCTL_MONITOR_OP_ENABLE 0
-#define XEN_DOMCTL_MONITOR_OP_DISABLE 1
+#define XEN_DOMCTL_MONITOR_OP_ENABLE 0
+#define XEN_DOMCTL_MONITOR_OP_DISABLE 1
+#define XEN_DOMCTL_MONITOR_OP_GET_CAPABILITIES 2
#define XEN_DOMCTL_MONITOR_EVENT_WRITE_CTRLREG 0
#define XEN_DOMCTL_MONITOR_EVENT_MOV_TO_MSR 1
@@ -1008,7 +1012,15 @@ DEFINE_XEN_GUEST_HANDLE(xen_domctl_psr_cmt_op_t);
struct xen_domctl_monitor_op {
uint32_t op; /* XEN_DOMCTL_MONITOR_OP_* */
- uint32_t event; /* XEN_DOMCTL_MONITOR_EVENT_* */
+
+ /*
+ * When used with ENABLE/DISABLE this has to be set to
+ * the requested XEN_DOMCTL_MONITOR_EVENT_* value.
+ * With GET_CAPABILITIES this field returns a bitmap of
+ * events supported by the platform, in the format
+ * (1 << XEN_DOMCTL_MONITOR_EVENT_*).
+ */
+ uint32_t event;
/*
* Further options when issuing XEN_DOMCTL_MONITOR_OP_ENABLE.
--
2.1.4
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