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Re: [PATCH v2 1/4] x86/xen: remove 32-bit Xen PV guest support
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Date: Thu, 2 Jul 2020 19:27:26 -0400
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
- Delivery-date: Thu, 02 Jul 2020 23:27:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 7/2/20 7:24 PM, Andrew Cooper wrote:
> On 02/07/2020 23:59, Boris Ostrovsky wrote:
>> On 7/1/20 7:06 AM, Juergen Gross wrote:
>>>
>>> -#ifdef CONFIG_X86_PAE
>>> -static void xen_set_pte_atomic(pte_t *ptep, pte_t pte)
>>> -{
>>> - trace_xen_mmu_set_pte_atomic(ptep, pte);
>>> - __xen_set_pte(ptep, pte);
>> Probably not for this series but I wonder whether __xen_set_pte() should
>> continue to use hypercall now that we are 64-bit only.
> The hypercall path is a SYSCALL (and SYSRET out).
>
> The "writeable" PTE path is a #PF, followed by an x86 instruction
> emulation, which then reaches the same logic as the hypercall path (and
> an IRET out).
Then we should at least update the comment.
-boris
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