[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging-4.12] x86/S3: put data segment registers into known state upon resume
commit 85ce36d12b43ed15e556265c6204858d3b52d747 Author: Jan Beulich <jbeulich@xxxxxxxx> AuthorDate: Fri Aug 7 17:31:16 2020 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Fri Aug 7 17:31:16 2020 +0200 x86/S3: put data segment registers into known state upon resume wakeup_32 sets %ds and %es to BOOT_DS, while leaving %fs at what wakeup_start did set it to, and %gs at whatever BIOS did load into it. All of this may end up confusing the first load_segments() to run on the BSP after resume, in particular allowing a non-nul selector value to be left in %fs. Alongside %ss, also put all other data segment registers into the same state that the boot and CPU bringup paths put them in. Reported-by: M. Vefa Bicakci <m.v.b@xxxxxxxxxx> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> master commit: 55f8c389d4348cc517946fdcb10794112458e81e master date: 2020-07-24 10:17:26 +0200 --- xen/arch/x86/acpi/wakeup_prot.S | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/xen/arch/x86/acpi/wakeup_prot.S b/xen/arch/x86/acpi/wakeup_prot.S index 361751d290..6dc9e2bd82 100644 --- a/xen/arch/x86/acpi/wakeup_prot.S +++ b/xen/arch/x86/acpi/wakeup_prot.S @@ -84,6 +84,12 @@ ENTRY(__ret_point) mov REF(saved_ss), %ss LOAD_GREG(sp) + mov $__HYPERVISOR_DS64, %eax + mov %eax, %ds + mov %eax, %es + mov %eax, %fs + mov %eax, %gs + /* Reload code selector */ pushq $(__HYPERVISOR_CS64) leaq 1f(%rip),%rax -- generated by git-patchbot for /home/xen/git/xen.git#staging-4.12
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