[Xen-changelog] [xen staging] x86/domain: Add Hygon Dhyana support

[patchbot@xxxxxxx]

commit c8604e3e60325663df55a0831c2a37d857da3a24
Author:     Pu Wen <puwen@xxxxxxxx>
AuthorDate: Thu Apr 4 21:47:29 2019 +0800
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Jun 6 15:28:21 2019 +0100

    x86/domain: Add Hygon Dhyana support
    
    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>
    [Rebase over 0cd074144cb "x86/cpu: Renumber X86_VENDOR_* to form a bitmap"]
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/dom0_build.c | 2 +-
 xen/arch/x86/domain.c     | 9 +++++----
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/xen/arch/x86/dom0_build.c b/xen/arch/x86/dom0_build.c
index 9b063639c9..c69570920c 100644
--- a/xen/arch/x86/dom0_build.c
+++ b/xen/arch/x86/dom0_build.c
@@ -542,7 +542,7 @@ 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 | 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 d505d2e456..894d8673e2 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1279,13 +1279,14 @@ 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 | X86_VENDOR_HYGON)) )      \
         asm volatile ( "movl %k0, %%" #seg            \
                        :: "r" (FLAT_USER_DS32) );     \
 } while ( false )
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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