From: Paolo Bonzini
On 32-bit systems, the initial_page_table is reused by
efi_call_phys_prolog as an identity map to call
SetVirtualAddressMap. efi_call_phys_prolog takes care of
converting the current CPU's GDT to a physical address too.
For PAE kernels the identity mapping is achieved by ali
On October 14, 2015 2:39:58 PM PDT, Andy Lutomirski wrote:
>On Wed, Oct 14, 2015 at 2:00 PM, Matt Fleming
> wrote:
>> On Wed, 14 Oct, at 09:22:03AM, Andy Lutomirski wrote:
>>> On Wed, Oct 14, 2015 at 6:52 AM, Matt Fleming
> wrote:
>>> > (Pulling in luto for low-level x86 fu)
>>> >
>>> > On Wed, 14
nd this issue well enough to call this fixed.
I've queued the following patch up in my urgent tree and I'll send a
pull request to the tip folks tomorrow.
---
>From 72ac9f242fad7c3bf3e06461e34c9a546d8cb411 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini
Date: Wed, 14 Oct 2015 13:30:45 +0200
On Wed, Oct 14, 2015 at 2:00 PM, Matt Fleming wrote:
> On Wed, 14 Oct, at 09:22:03AM, Andy Lutomirski wrote:
>> On Wed, Oct 14, 2015 at 6:52 AM, Matt Fleming
>> wrote:
>> > (Pulling in luto for low-level x86 fu)
>> >
>> > On Wed, 14 Oct, at 01:30:45PM, Paolo Bonzini wrote:
>> >> On 32-bit system
On Wed, 14 Oct, at 04:29:33PM, Paolo Bonzini wrote:
>
> On 14/10/2015 15:52, Matt Fleming wrote:
> >> > However, for non-PAE kernels there is no guarantee that the identity
> >> > mapping in the initial_page_table extends as far as the GDT; in this
> >> > case, accesses to the GDT will cause a pag
On Wed, 14 Oct, at 09:22:03AM, Andy Lutomirski wrote:
> On Wed, Oct 14, 2015 at 6:52 AM, Matt Fleming
> wrote:
> > (Pulling in luto for low-level x86 fu)
> >
> > On Wed, 14 Oct, at 01:30:45PM, Paolo Bonzini wrote:
> >> On 32-bit systems, the initial_page_table is reused by
> >> efi_call_phys_prol
On Wed, Oct 14, 2015 at 6:52 AM, Matt Fleming wrote:
> (Pulling in luto for low-level x86 fu)
>
> On Wed, 14 Oct, at 01:30:45PM, Paolo Bonzini wrote:
>> On 32-bit systems, the initial_page_table is reused by
>> efi_call_phys_prolog as an identity map to call
>> SetVirtualAddressMap. efi_call_phys
On 14/10/2015 15:52, Matt Fleming wrote:
>> > However, for non-PAE kernels there is no guarantee that the identity
>> > mapping in the initial_page_table extends as far as the GDT; in this
>> > case, accesses to the GDT will cause a page fault (which quickly becomes
>> > a triple fault). Fix thi
(Pulling in luto for low-level x86 fu)
On Wed, 14 Oct, at 01:30:45PM, Paolo Bonzini wrote:
> On 32-bit systems, the initial_page_table is reused by
> efi_call_phys_prolog as an identity map to call
> SetVirtualAddressMap. efi_call_phys_prolog takes care of
> converting the current CPU's GDT to a
On 32-bit systems, the initial_page_table is reused by
efi_call_phys_prolog as an identity map to call
SetVirtualAddressMap. efi_call_phys_prolog takes care of
converting the current CPU's GDT to a physical address too.
For PAE kernels the identity mapping is achieved by aliasing the
first PDPE f
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