[Xen-devel] [PATCH] linux-2.6.18: add privileged/unprivileged kernel feature indication

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

This is the kernel side change accompanying the earlier sent Xen side
patch titled identically.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- a/arch/i386/kernel/head-xen.S
+++ b/arch/i386/kernel/head-xen.S
@@ -137,6 +137,12 @@ ENTRY(cpu_gdt_table)
        .quad 0x0000000000000000        /* 0xf0 - unused */
        .quad 0x0000000000000000        /* 0xf8 - GDT entry 31: double-fault 
TSS */
 
+#ifdef CONFIG_XEN_UNPRIVILEGED_GUEST
+# define XEN_PRIV_CAP "!unprivileged"
+#else
+# define XEN_PRIV_CAP "privileged|unprivileged"
+#endif
+
 #if CONFIG_XEN_COMPAT <= 0x030002
 /*
  * __xen_guest information
@@ -163,7 +169,8 @@ ENTRY(cpu_gdt_table)
                utoa (__PAGE_OFFSET + __PHYSICAL_START + VIRT_ENTRY_OFFSET)
        .ascii  ",HYPERCALL_PAGE=0x"
                utoa ((__PHYSICAL_START+HYPERCALL_PAGE_OFFSET)>>PAGE_SHIFT)
-       .ascii  ",FEATURES=writable_page_tables"
+       .ascii  ",FEATURES=" XEN_PRIV_CAP
+       .ascii           "|writable_page_tables"
        .ascii           "|writable_descriptor_tables"
        .ascii           "|auto_translated_physmap"
        .ascii           "|pae_pgdir_above_4gb"
@@ -190,7 +197,12 @@ ENTRY(cpu_gdt_table)
        ELFNOTE(Xen, XEN_ELFNOTE_ENTRY,          .long,  startup_32)
        ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, .long,  hypercall_page)
        ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW,   .long,  HYPERVISOR_VIRT_START)
-       ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,       .asciz, 
"writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel")
+       ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,       .ascii, XEN_PRIV_CAP;
+                                                .ascii  
"|writable_page_tables";
+                                                .ascii  
"|writable_descriptor_tables";
+                                                .ascii  
"|auto_translated_physmap";
+                                                .ascii  "|pae_pgdir_above_4gb";
+                                                .asciz  
"|supervisor_mode_kernel")
 #ifdef CONFIG_X86_PAE
        ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE,       .asciz, "yes")
        ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,   .quad,  
_PAGE_PRESENT,_PAGE_PRESENT)
--- a/arch/x86_64/kernel/head-xen.S
+++ b/arch/x86_64/kernel/head-xen.S
@@ -160,6 +160,12 @@ gdt_end:
 ENTRY(empty_zero_page)
        .skip PAGE_SIZE
 
+#ifdef CONFIG_XEN_UNPRIVILEGED_GUEST
+# define XEN_PRIV_CAP "!unprivileged"
+#else
+# define XEN_PRIV_CAP "privileged|unprivileged"
+#endif
+
 #if CONFIG_XEN_COMPAT <= 0x030002
 /*
  * __xen_guest information
@@ -186,7 +192,8 @@ ENTRY(empty_zero_page)
                utoh (__START_KERNEL_map + __PHYSICAL_START)
        .ascii  ",HYPERCALL_PAGE=0x"
                utoh (phys_hypercall_page >> PAGE_SHIFT)
-       .ascii  ",FEATURES=writable_page_tables"
+       .ascii  ",FEATURES=" XEN_PRIV_CAP
+       .ascii           "|writable_page_tables"
        .ascii           "|writable_descriptor_tables"
        .ascii           "|auto_translated_physmap"
        .ascii           "|supervisor_mode_kernel"
@@ -206,6 +213,10 @@ ENTRY(empty_zero_page)
        ELFNOTE(Xen, XEN_ELFNOTE_ENTRY,          .quad,  startup_64)
        ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, .quad,  hypercall_page)
        ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,   .quad,  
_PAGE_PRESENT,_PAGE_PRESENT)
-       ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,       .asciz, 
"writable_page_tables|writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel")
+       ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,       .ascii, XEN_PRIV_CAP;
+                                                .ascii "|writable_page_tables";
+                                                .ascii 
"|writable_descriptor_tables";
+                                                .ascii 
"|auto_translated_physmap";
+                                                .asciz 
"|supervisor_mode_kernel")
        ELFNOTE(Xen, XEN_ELFNOTE_LOADER,         .asciz, "generic")
        ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long,  1)

Attachment: xen-kernel-cap.patch
Description: Text document

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