Eric W. Biederman wrote:
Jeremy Fitzhardinge <[email protected]> writes:H. Peter Anvin wrote:It would be *trivial* to make a certain number of page table slotsavailable at the end of the head.S-generated map.Or you could use a fixmap.That certain number of page table slots should be the fixmap slots. If you do that bt_ioremap works, we remove a boatload of special cases and the code becomes simpler.
It's probably worth noting that several of the non-PC ports already do exactly this, although in a hacky way. Grep for pg0 and you'll find it.
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- References:
- [PATCH 00/28] Updates for firstfloor paravirt-ops patches
- From: Jeremy Fitzhardinge <[email protected]>
- Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
- From: Andi Kleen <[email protected]>
- Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
- From: "H. Peter Anvin" <[email protected]>
- Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
- From: Andi Kleen <[email protected]>
- Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
- From: "H. Peter Anvin" <[email protected]>
- Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
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- Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
- From: Jeremy Fitzhardinge <[email protected]>
- Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
- From: [email protected] (Eric W. Biederman)
- Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
- From: Jeremy Fitzhardinge <[email protected]>
- Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
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- Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
- From: [email protected] (Eric W. Biederman)
- Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
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- Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
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- From: Jeremy Fitzhardinge <[email protected]>
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- From: [email protected] (Eric W. Biederman)
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