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Re: [PATCH] x86/boot: Drop stale comment about zeroing the stack
- To: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 16 Sep 2024 14:17:49 +0100
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 16 Sep 2024 13:17:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16/09/2024 2:16 pm, Frediano Ziglio wrote:
> On Mon, Sep 16, 2024 at 12:58 PM Andrew Cooper
> <andrew.cooper3@xxxxxxxxxx> wrote:
>> This used to be true, but was altered by commit 37786b23b027 ("x86/cet:
>> Remove
>> writeable mapping of the BSPs shadow stack") which moved cpu0_stack into
>> .init.bss.stack_aligned.
>>
>> Fixes: 37786b23b027 ("x86/cet: Remove writeable mapping of the BSPs shadow
>> stack")
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> ---
>> CC: Jan Beulich <JBeulich@xxxxxxxx>
>> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>> CC: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
>> ---
>> xen/arch/x86/boot/head.S | 6 +-----
>> 1 file changed, 1 insertion(+), 5 deletions(-)
>>
>> diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S
>> index 12bbb97f33d4..cfc5a7b47d29 100644
>> --- a/xen/arch/x86/boot/head.S
>> +++ b/xen/arch/x86/boot/head.S
>> @@ -652,11 +652,7 @@ trampoline_setup:
>> cmpb $0, sym_esi(efi_platform)
>> jnz 1f
>>
>> - /*
>> - * Initialise the BSS.
>> - *
>> - * !!! WARNING - also zeroes the current stack !!!
>> - */
>> + /* Initialise the BSS. */
>> lea sym_esi(__bss_start), %edi
>> lea sym_esi(__bss_end), %ecx
>> sub %edi,%ecx
>>
>> base-commit: a8bf14f6f331d4f428010b4277b67c33f561ed19
> Nice to know!
Indeed, and it certainly helps one of your rearranging patches.
> Acked-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
Thanks.
~Andrew
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