[xen staging] x86/spec-ctrl: initialize per-domain XPTI in spec_ctrl_init_domain()

[patchbot@xxxxxxx]

commit d18f8153be4c57e452495f468e2e22d2b749f07f
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Wed Aug 14 15:39:26 2024 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Aug 14 15:39:26 2024 +0200

    x86/spec-ctrl: initialize per-domain XPTI in spec_ctrl_init_domain()
    
    XPTI being a speculation mitigation feels better to be initialized in
    spec_ctrl_init_domain().
    
    No functional change intended, although the call to spec_ctrl_init_domain() 
in
    arch_domain_create() needs to be moved ahead of pv_domain_initialise() for
    d->->arch.pv.xpti to be correctly set.
    
    Move it ahead of most of the initialization functions, since
    spec_ctrl_init_domain() doesn't depend on any member in the struct domain 
being
    set.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/domain.c    | 4 ++--
 xen/arch/x86/pv/domain.c | 2 --
 xen/arch/x86/spec_ctrl.c | 4 ++++
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index d977ec71ca..89aad7e897 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -830,6 +830,8 @@ int arch_domain_create(struct domain *d,
         is_pv_domain(d) ? __HYPERVISOR_COMPAT_VIRT_START : ~0u;
 #endif
 
+    spec_ctrl_init_domain(d);
+
     if ( (rc = paging_domain_init(d)) != 0 )
         goto fail;
     paging_initialised = true;
@@ -896,8 +898,6 @@ int arch_domain_create(struct domain *d,
 
     d->arch.msr_relaxed = config->arch.misc_flags & XEN_X86_MSR_RELAXED;
 
-    spec_ctrl_init_domain(d);
-
     return 0;
 
  fail:
diff --git a/xen/arch/x86/pv/domain.c b/xen/arch/x86/pv/domain.c
index 2a445bb17b..86b74fb372 100644
--- a/xen/arch/x86/pv/domain.c
+++ b/xen/arch/x86/pv/domain.c
@@ -383,8 +383,6 @@ int pv_domain_initialise(struct domain *d)
 
     d->arch.ctxt_switch = &pv_csw;
 
-    d->arch.pv.xpti = is_hardware_domain(d) ? opt_xpti_hwdom : opt_xpti_domu;
-
     if ( !is_pv_32bit_domain(d) && use_invpcid && cpu_has_pcid )
         switch ( ACCESS_ONCE(opt_pcid) )
         {
diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c
index 92405b8be7..75a4177a75 100644
--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -1748,6 +1748,10 @@ void spec_ctrl_init_domain(struct domain *d)
         (ibpb   ? SCF_entry_ibpb   : 0) |
         (bhb    ? SCF_entry_bhb    : 0) |
         0;
+
+    if ( pv )
+        d->arch.pv.xpti = is_hardware_domain(d) ? opt_xpti_hwdom
+                                                : opt_xpti_domu;
 }
 
 void __init init_speculation_mitigations(void)
--
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