hvm/svm: Enable MSR events

At this moment there is no function to enable msr interception on svm.

This patch implements this function and moves the mov to msr monitor
event
form the Intel arch side to the common capabilities.

Signed-off-by: Alexandru Isaila <aisaila@bitdefender.com>
Acked-by: Tamas K Lengyel <tamas@tklengyel.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

xen/arch/x86/hvm/svm/svm.c

@@ -163,6 +163,14 @@ void svm_intercept_msr(struct vcpu *v, uint32_t msr, int flags)
         __clear_bit(msr * 2 + 1, msr_bit);
 }
 
+static void svm_enable_msr_interception(struct domain *d, uint32_t msr)
+{
+    struct vcpu *v;
+
+    for_each_vcpu ( d, v )
+        svm_intercept_msr(v, msr, MSR_INTERCEPT_WRITE);
+}
+
 static void svm_save_dr(struct vcpu *v)
 {
     struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
@@ -2457,6 +2465,7 @@ static struct hvm_function_table __initdata svm_function_table = {
     .fpu_dirty_intercept  = svm_fpu_dirty_intercept,
     .msr_read_intercept   = svm_msr_read_intercept,
     .msr_write_intercept  = svm_msr_write_intercept,
+    .enable_msr_interception = svm_enable_msr_interception,
     .set_rdtsc_exiting    = svm_set_rdtsc_exiting,
     .set_descriptor_access_exiting = svm_set_descriptor_access_exiting,
     .get_insn_bytes       = svm_get_insn_bytes,

xen/include/asm-x86/monitor.h

@@ -78,12 +78,12 @@ static inline uint32_t arch_monitor_get_capabilities(struct domain *d)
         return capabilities;
 
     capabilities = ((1U << XEN_DOMCTL_MONITOR_EVENT_GUEST_REQUEST) |
-                    (1U << XEN_DOMCTL_MONITOR_EVENT_SOFTWARE_BREAKPOINT));
+                    (1U << XEN_DOMCTL_MONITOR_EVENT_SOFTWARE_BREAKPOINT) |
+                    (1U << XEN_DOMCTL_MONITOR_EVENT_MOV_TO_MSR));
 
     if ( cpu_has_vmx )
     {
         capabilities |= ((1U << XEN_DOMCTL_MONITOR_EVENT_WRITE_CTRLREG) |
-                         (1U << XEN_DOMCTL_MONITOR_EVENT_MOV_TO_MSR) |
                          (1U << XEN_DOMCTL_MONITOR_EVENT_DEBUG_EXCEPTION) |
                          (1U << XEN_DOMCTL_MONITOR_EVENT_CPUID) |
                          (1U << XEN_DOMCTL_MONITOR_EVENT_INTERRUPT) |