[xen staging] viridian: log initial invocation of each type of hypercall

[patchbot@xxxxxxx]

commit 30d3cc449338546134b18ebcc2b4b435a794da17
Author:     Paul Durrant <pdurrant@xxxxxxxxxx>
AuthorDate: Fri Dec 4 13:15:38 2020 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Dec 4 13:15:38 2020 +0100

    viridian: log initial invocation of each type of hypercall
    
    To make is simpler to observe which viridian hypercalls are issued by a
    particular Windows guest, this patch adds a per-domain mask to track them.
    Each type of hypercall causes a different bit to be set in the mask and
    when the bit transitions from clear to set, a log line is emitted showing
    the name of the hypercall and the domain that issued it.
    
    Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
    Acked-by: Wei Liu <wl@xxxxxxx>
---
 xen/arch/x86/hvm/viridian/viridian.c | 21 +++++++++++++++++++++
 xen/include/asm-x86/hvm/viridian.h   | 10 ++++++++++
 2 files changed, 31 insertions(+)

diff --git a/xen/arch/x86/hvm/viridian/viridian.c 
b/xen/arch/x86/hvm/viridian/viridian.c
index 5e4a2fa53a..efd8e3a900 100644
--- a/xen/arch/x86/hvm/viridian/viridian.c
+++ b/xen/arch/x86/hvm/viridian/viridian.c
@@ -933,6 +933,7 @@ int viridian_hypercall(struct cpu_user_regs *regs)
 {
     struct vcpu *curr = current;
     struct domain *currd = curr->domain;
+    struct viridian_domain *vd = currd->arch.hvm.viridian;
     int mode = hvm_guest_x86_mode(curr);
     unsigned long input_params_gpa, output_params_gpa;
     int rc = 0;
@@ -962,6 +963,10 @@ int viridian_hypercall(struct cpu_user_regs *regs)
     switch ( input.call_code )
     {
     case HVCALL_NOTIFY_LONG_SPIN_WAIT:
+        if ( !test_and_set_bit(_HCALL_spin_wait, vd->hypercall_flags) )
+            printk(XENLOG_G_INFO "d%d: VIRIDIAN 
HVCALL_NOTIFY_LONG_SPIN_WAIT\n",
+                   currd->domain_id);
+
         /*
          * See section 14.5.1 of the specification.
          */
@@ -970,22 +975,38 @@ int viridian_hypercall(struct cpu_user_regs *regs)
 
     case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE:
     case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST:
+        if ( !test_and_set_bit(_HCALL_flush, vd->hypercall_flags) )
+            printk(XENLOG_G_INFO "%pd: VIRIDIAN 
HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE/LIST\n",
+                   currd);
+
         rc = hvcall_flush(&input, &output, input_params_gpa,
                           output_params_gpa);
         break;
 
     case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX:
     case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX:
+        if ( !test_and_set_bit(_HCALL_flush_ex, vd->hypercall_flags) )
+            printk(XENLOG_G_INFO "%pd: VIRIDIAN 
HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE/LIST_EX\n",
+                   currd);
+
         rc = hvcall_flush_ex(&input, &output, input_params_gpa,
                              output_params_gpa);
         break;
 
     case HVCALL_SEND_IPI:
+        if ( !test_and_set_bit(_HCALL_ipi, vd->hypercall_flags) )
+            printk(XENLOG_G_INFO "%pd: VIRIDIAN HVCALL_SEND_IPI\n",
+                   currd);
+
         rc = hvcall_ipi(&input, &output, input_params_gpa,
                         output_params_gpa);
         break;
 
     case HVCALL_SEND_IPI_EX:
+        if ( !test_and_set_bit(_HCALL_ipi_ex, vd->hypercall_flags) )
+            printk(XENLOG_G_INFO "%pd: VIRIDIAN HVCALL_SEND_IPI_EX\n",
+                   currd);
+
         rc = hvcall_ipi_ex(&input, &output, input_params_gpa,
                            output_params_gpa);
         break;
diff --git a/xen/include/asm-x86/hvm/viridian.h 
b/xen/include/asm-x86/hvm/viridian.h
index cbf77d9c76..4c8ff6e80b 100644
--- a/xen/include/asm-x86/hvm/viridian.h
+++ b/xen/include/asm-x86/hvm/viridian.h
@@ -55,10 +55,20 @@ struct viridian_time_ref_count
     int64_t off;
 };
 
+enum {
+    _HCALL_spin_wait,
+    _HCALL_flush,
+    _HCALL_flush_ex,
+    _HCALL_ipi,
+    _HCALL_ipi_ex,
+    _HCALL_nr /* must be last */
+};
+
 struct viridian_domain
 {
     union hv_guest_os_id guest_os_id;
     union hv_vp_assist_page_msr hypercall_gpa;
+    DECLARE_BITMAP(hypercall_flags, _HCALL_nr);
     struct viridian_time_ref_count time_ref_count;
     struct viridian_page reference_tsc;
 };
--
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