[xen staging] x86/hvm: Replace do_sched_op calls with their underlying logic

[patchbot@xxxxxxx]

commit 8af285ff79fe2562c8c0faaeea804e1df480e7d0
Author:     Teddy Astie <teddy.astie@xxxxxxxxxx>
AuthorDate: Thu Jul 31 13:47:41 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Jul 31 14:44:02 2025 +0200

    x86/hvm: Replace do_sched_op calls with their underlying logic
    
    do_sched_op(SCHEDOP_yield) just calls vcpu_yield(). Remove the indirection
    through the hypercall handler and use the function directly.
    
    Export vcpu_block_enable_events() to perform the same for SCHEDOP_block.
    
    Not a functional change.
    
    Signed-off-by: Teddy Astie <teddy.astie@xxxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c               | 2 +-
 xen/arch/x86/hvm/svm/svm.c           | 2 +-
 xen/arch/x86/hvm/viridian/viridian.c | 2 +-
 xen/arch/x86/hvm/vmx/vmx.c           | 2 +-
 xen/common/sched/core.c              | 2 +-
 xen/include/xen/sched.h              | 1 +
 6 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 56c7de3977..cb8ecd050d 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -1736,7 +1736,7 @@ void hvm_hlt(unsigned int eflags)
     if ( unlikely(!(eflags & X86_EFLAGS_IF)) )
         return hvm_vcpu_down(curr);
 
-    do_sched_op(SCHEDOP_block, guest_handle_from_ptr(NULL, void));
+    vcpu_block_enable_events();
 
     TRACE(TRC_HVM_HLT, /* pending = */ vcpu_runnable(curr));
 }
diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index db1799bb43..fce750ca1f 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -2159,7 +2159,7 @@ static void svm_vmexit_do_pause(struct cpu_user_regs 
*regs)
      * Do something useful, like reschedule the guest
      */
     perfc_incr(pauseloop_exits);
-    do_sched_op(SCHEDOP_yield, guest_handle_from_ptr(NULL, void));
+    vcpu_yield();
 }
 
 static void
diff --git a/xen/arch/x86/hvm/viridian/viridian.c 
b/xen/arch/x86/hvm/viridian/viridian.c
index 33d54e587e..7ea6c90168 100644
--- a/xen/arch/x86/hvm/viridian/viridian.c
+++ b/xen/arch/x86/hvm/viridian/viridian.c
@@ -959,7 +959,7 @@ int viridian_hypercall(struct cpu_user_regs *regs)
         /*
          * See section 14.5.1 of the specification.
          */
-        do_sched_op(SCHEDOP_yield, guest_handle_from_ptr(NULL, void));
+        vcpu_yield();
         break;
 
     case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE:
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index ce538668c7..cb82d52ef0 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -4768,7 +4768,7 @@ void asmlinkage vmx_vmexit_handler(struct cpu_user_regs 
*regs)
 
     case EXIT_REASON_PAUSE_INSTRUCTION:
         perfc_incr(pauseloop_exits);
-        do_sched_op(SCHEDOP_yield, guest_handle_from_ptr(NULL, void));
+        vcpu_yield();
         break;
 
     case EXIT_REASON_XSETBV:
diff --git a/xen/common/sched/core.c b/xen/common/sched/core.c
index f5a1099ba9..2ab4313517 100644
--- a/xen/common/sched/core.c
+++ b/xen/common/sched/core.c
@@ -1430,7 +1430,7 @@ void vcpu_block(void)
     }
 }
 
-static void vcpu_block_enable_events(void)
+void vcpu_block_enable_events(void)
 {
     local_event_delivery_enable();
     vcpu_block();
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index df23411869..fd5c9f9333 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -1030,6 +1030,7 @@ static inline bool vcpu_cpu_dirty(const struct vcpu *v)
 }
 
 void vcpu_block(void);
+void vcpu_block_enable_events(void);
 void vcpu_unblock(struct vcpu *v);
 
 void vcpu_pause(struct vcpu *v);
--
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