summarylogtreecommitdiffstats
path: root/0003-x86-xen-init-gs-very-early-to-avoid-page-faults-with.patch
diff options
context:
space:
mode:
Diffstat (limited to '0003-x86-xen-init-gs-very-early-to-avoid-page-faults-with.patch')
-rw-r--r--0003-x86-xen-init-gs-very-early-to-avoid-page-faults-with.patch80
1 files changed, 0 insertions, 80 deletions
diff --git a/0003-x86-xen-init-gs-very-early-to-avoid-page-faults-with.patch b/0003-x86-xen-init-gs-very-early-to-avoid-page-faults-with.patch
deleted file mode 100644
index 4b490730e3c..00000000000
--- a/0003-x86-xen-init-gs-very-early-to-avoid-page-faults-with.patch
+++ /dev/null
@@ -1,80 +0,0 @@
-From cd0c80aa02dbfe649c743fa98fcc0d9f427e0827 Mon Sep 17 00:00:00 2001
-Message-Id: <cd0c80aa02dbfe649c743fa98fcc0d9f427e0827.1518828081.git.jan.steffens@gmail.com>
-In-Reply-To: <05a43fb8b36cdaf6a3580f46cab334f2c2796544.1518828081.git.jan.steffens@gmail.com>
-References: <05a43fb8b36cdaf6a3580f46cab334f2c2796544.1518828081.git.jan.steffens@gmail.com>
-From: Juergen Gross <jgross@suse.com>
-Date: Thu, 1 Feb 2018 13:40:19 +0100
-Subject: [PATCH 3/3] x86/xen: init %gs very early to avoid page faults with
- stack protector
-
-When running as Xen pv guest %gs is initialized some time after
-C code is started. Depending on stack protector usage this might be
-too late, resulting in page faults.
-
-So setup %gs and MSR_GS_BASE in assembly code already.
-
-Cc: stable@vger.kernel.org
-Signed-off-by: Juergen Gross <jgross@suse.com>
-Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
-Tested-by: Chris Patterson <cjp256@gmail.com>
-Signed-off-by: Juergen Gross <jgross@suse.com>
----
- arch/x86/xen/xen-head.S | 16 ++++++++++++++++
- 1 file changed, 16 insertions(+)
-
-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
-@@ -9,32 +9,48 @@
-
- #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>
- #include <xen/interface/features.h>
- #include <xen/interface/xen.h>
- #include <xen/interface/xen-mca.h>
- #include <asm/xen/interface.h>
-
- #ifdef CONFIG_XEN_PV
- __INIT
- ENTRY(startup_xen)
- UNWIND_HINT_EMPTY
- cld
-
- /* Clear .bss */
- xor %eax,%eax
- mov $__bss_start, %_ASM_DI
- mov $__bss_stop, %_ASM_CX
- sub %_ASM_DI, %_ASM_CX
- shr $__ASM_SEL(2, 3), %_ASM_CX
- rep __ASM_SIZE(stos)
-
- 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
---
-2.16.1
-