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authorLinus Torvalds <torvalds@linux-foundation.org>2018-02-09 10:07:39 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-09 10:07:39 -0800
commitf9f1e414128ea58d8e848a0275db0f644c9e9f45 (patch)
tree9fe49804e165527116c49ca207247de1defbcf0a /arch/x86
parentdff839f27dc8d70e191562c8e78b0a9a88028362 (diff)
parent781198f1f373c3e350dbeb3af04a7d4c81c1b8d7 (diff)
downloadlinux-f9f1e414128ea58d8e848a0275db0f644c9e9f45.tar.bz2
Merge tag 'for-linus-4.16-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross: "Only five small fixes for issues when running under Xen" * tag 'for-linus-4.16-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen: Fix {set,clear}_foreign_p2m_mapping on autotranslating guests pvcalls-back: do not return error on inet_accept EAGAIN xen-netfront: Fix race between device setup and open xen/grant-table: Use put_page instead of free_page x86/xen: init %gs very early to avoid page faults with stack protector
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/xen/p2m.c6
-rw-r--r--arch/x86/xen/xen-head.S16
2 files changed, 22 insertions, 0 deletions
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 13b4f19b9131..159a897151d6 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -694,6 +694,9 @@ int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
int i, ret = 0;
pte_t *pte;
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return 0;
+
if (kmap_ops) {
ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref,
kmap_ops, count);
@@ -736,6 +739,9 @@ int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
{
int i, ret = 0;
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return 0;
+
for (i = 0; i < count; i++) {
unsigned long mfn = __pfn_to_mfn(page_to_pfn(pages[i]));
unsigned long pfn = page_to_pfn(pages[i]);
diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index 497cc55a0c16..96f26e026783 100644
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -9,7 +9,9 @@
#include <asm/boot.h>
#include <asm/asm.h>
+#include <asm/msr.h>
#include <asm/page_types.h>
+#include <asm/percpu.h>
#include <asm/unwind_hints.h>
#include <xen/interface/elfnote.h>
@@ -35,6 +37,20 @@ ENTRY(startup_xen)
mov %_ASM_SI, xen_start_info
mov $init_thread_union+THREAD_SIZE, %_ASM_SP
+#ifdef CONFIG_X86_64
+ /* Set up %gs.
+ *
+ * The base of %gs always points to the bottom of the irqstack
+ * union. If the stack protector canary is enabled, it is
+ * located at %gs:40. Note that, on SMP, the boot cpu uses
+ * init data section till per cpu areas are set up.
+ */
+ movl $MSR_GS_BASE,%ecx
+ movq $INIT_PER_CPU_VAR(irq_stack_union),%rax
+ cdq
+ wrmsr
+#endif
+
jmp xen_start_kernel
END(startup_xen)
__FINIT