[xen staging] x86/pv: Unhide writes to d->arch.hv_compat_vstart

[patchbot@xxxxxxx]

commit 6633b7b8f108fe741b69b5c92c1db5b52c5f1a20
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Tue Dec 9 15:51:27 2025 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Dec 10 14:48:45 2025 +0000

    x86/pv: Unhide writes to d->arch.hv_compat_vstart
    
    The variable, when compiled in, is never 0, but because the writes into it 
are
    hidden behind the HYPERVISOR_COMPAT_VIRT_START() macro, it has a very good
    impression of being 0.
    
    No functional change.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Grygorii Strashko <grygorii_strashko@xxxxxxxx>
---
 xen/arch/x86/domain.c        | 2 +-
 xen/arch/x86/pv/dom0_build.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index bd75d044a0..d33a42c882 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -891,7 +891,7 @@ int arch_domain_create(struct domain *d,
     d->arch.emulation_flags = emflags;
 
 #ifdef CONFIG_PV32
-    HYPERVISOR_COMPAT_VIRT_START(d) =
+    d->arch.hv_compat_vstart =
         is_pv_domain(d) ? __HYPERVISOR_COMPAT_VIRT_START : ~0u;
 #endif
 
diff --git a/xen/arch/x86/pv/dom0_build.c b/xen/arch/x86/pv/dom0_build.c
index 21158ce181..fed03dc15d 100644
--- a/xen/arch/x86/pv/dom0_build.c
+++ b/xen/arch/x86/pv/dom0_build.c
@@ -521,7 +521,7 @@ static int __init dom0_construct(const struct boot_domain 
*bd)
                 printk("Dom0 expects too high a hypervisor start address\n");
                 return -ERANGE;
             }
-            HYPERVISOR_COMPAT_VIRT_START(d) =
+            d->arch.hv_compat_vstart =
                 max_t(unsigned int, m2p_compat_vstart, value);
         }
 
--
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