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Re: [PATCH v2 1/4] x86/xen: remove 32-bit Xen PV guest support
- To: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>, <x86@xxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 3 Jul 2020 00:24:06 +0100
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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 23:24:22 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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).
~Andrew
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