[Xen-devel] [PATCH v4 11/15] x86/domain: Add Hygon Dhyana support

[Pu Wen <puwen@xxxxxxxx>]

Add Hygon Dhyana support to handle HyperTransport range.

Also loading a nul selector does not clear bases and limits on Hygon
CPUs, so add Hygon Dhyana support to the function preload_segment.

Signed-off-by: Pu Wen <puwen@xxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/dom0_build.c | 3 ++-
 xen/arch/x86/domain.c     | 9 +++++----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/xen/arch/x86/dom0_build.c b/xen/arch/x86/dom0_build.c
index 6ebe367..6178d79 100644
--- a/xen/arch/x86/dom0_build.c
+++ b/xen/arch/x86/dom0_build.c
@@ -542,7 +542,8 @@ int __init dom0_setup_permissions(struct domain *d)
                             paddr_to_pfn(MSI_ADDR_BASE_LO +
                                          MSI_ADDR_DEST_ID_MASK));
     /* HyperTransport range. */
-    if ( boot_cpu_data.x86_vendor == X86_VENDOR_AMD )
+    if ( boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
+         boot_cpu_data.x86_vendor == X86_VENDOR_HYGON )
         rc |= iomem_deny_access(d, paddr_to_pfn(0xfdULL << 32),
                                 paddr_to_pfn((1ULL << 40) - 1));
 
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 8d579e2..eefe0fc 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1253,13 +1253,14 @@ arch_do_vcpu_op(
 }
 
 /*
- * Loading a nul selector does not clear bases and limits on AMD CPUs. Be on
- * the safe side and re-initialize both to flat segment values before loading
- * a nul selector.
+ * Loading a nul selector does not clear bases and limits on AMD or Hygon
+ * CPUs. Be on the safe side and re-initialize both to flat segment values
+ * before loading a nul selector.
  */
 #define preload_segment(seg, value) do {              \
     if ( !((value) & ~3) &&                           \
-         boot_cpu_data.x86_vendor == X86_VENDOR_AMD ) \
+        (boot_cpu_data.x86_vendor == X86_VENDOR_AMD || \
+         boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) ) \
         asm volatile ( "movl %k0, %%" #seg            \
                        :: "r" (FLAT_USER_DS32) );     \
 } while ( false )
-- 
2.7.4


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