提交 5d5791af 编写于 作者: A Andy Lutomirski 提交者: H. Peter Anvin

x86-64, xen: Enable the vvar mapping

Xen needs to handle VVAR_PAGE, introduced in git commit:
9fd67b4e
x86-64: Give vvars their own page

Otherwise we die during bootup with a message like:

(XEN) mm.c:940:d10 Error getting mfn 1888 (pfn 1e3e48) from L1 entry
      8000000001888465 for l1e_owner=10, pg_owner=10
(XEN) mm.c:5049:d10 ptwr_emulate: could not get_page_from_l1e()
[    0.000000] BUG: unable to handle kernel NULL pointer dereference at (null)
[    0.000000] IP: [<ffffffff8103a930>] xen_set_pte+0x20/0xe0
Signed-off-by: NAndy Lutomirski <luto@mit.edu>
Link: http://lkml.kernel.org/r/4659478ed2f3480938f96491c2ecbe2b2e113a23.1312378163.git.luto@mit.eduReviewed-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>
上级 f670bb76
...@@ -1829,6 +1829,7 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot) ...@@ -1829,6 +1829,7 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
# endif # endif
#else #else
case VSYSCALL_LAST_PAGE ... VSYSCALL_FIRST_PAGE: case VSYSCALL_LAST_PAGE ... VSYSCALL_FIRST_PAGE:
case VVAR_PAGE:
#endif #endif
case FIX_TEXT_POKE0: case FIX_TEXT_POKE0:
case FIX_TEXT_POKE1: case FIX_TEXT_POKE1:
...@@ -1869,7 +1870,8 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot) ...@@ -1869,7 +1870,8 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
#ifdef CONFIG_X86_64 #ifdef CONFIG_X86_64
/* Replicate changes to map the vsyscall page into the user /* Replicate changes to map the vsyscall page into the user
pagetable vsyscall mapping. */ pagetable vsyscall mapping. */
if (idx >= VSYSCALL_LAST_PAGE && idx <= VSYSCALL_FIRST_PAGE) { if ((idx >= VSYSCALL_LAST_PAGE && idx <= VSYSCALL_FIRST_PAGE) ||
idx == VVAR_PAGE) {
unsigned long vaddr = __fix_to_virt(idx); unsigned long vaddr = __fix_to_virt(idx);
set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte); set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte);
} }
......
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