xiaomi-sm8450/android_kernel_xiaomi_sm8450
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Kods Problēmas Izmaiņu pieprasījumi Darbības Pakotnes Projekti Laidieni Vikivietne Aktivitāte

xen: Support Xen pv-domains using PAT

Pārlūkot izejas kodu 
With the dynamical mapping between cache modes and pgprot values it is
now possible to use all cache modes via the Xen hypervisor PAT settings
in a pv domain.

All to be done is to read the PAT configuration MSR and set up the
translation tables accordingly.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stefan.bader@canonical.com
Cc: xen-devel@lists.xensource.com
Cc: ville.syrjala@linux.intel.com
Cc: jbeulich@suse.com
Cc: toshi.kani@hp.com
Cc: plagnioj@jcrosoft.com
Cc: tomi.valkeinen@ti.com
Cc: bhelgaas@google.com
Link: http://lkml.kernel.org/r/1415019724-4317-19-git-send-email-jgross@suse.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Šī revīzija ir iekļauta:
Juergen Gross
2014-11-03 14:02:04 +01:00
revīziju iesūtīja Thomas Gleixner
vecāks bd809af16e
revīzija 47591df505
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47
arch/x86/xen/mmu.c
Parādīt failu

@@ -410,13 +410,7 @@ static pteval_t pte_pfn_to_mfn(pteval_t val)
__visible pteval_t xen_pte_val(pte_t pte)
{
pteval_t pteval = pte.pte;
#if 0
/* If this is a WC pte, convert back from Xen WC to Linux WC */
if ((pteval & (_PAGE_PAT | _PAGE_PCD | _PAGE_PWT)) == _PAGE_PAT) {
WARN_ON(!pat_enabled);
pteval = (pteval & ~_PAGE_PAT) | _PAGE_PWT;
}
#endif
return pte_mfn_to_pfn(pteval);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_pte_val);
@@ -427,47 +421,8 @@ __visible pgdval_t xen_pgd_val(pgd_t pgd)
}
PV_CALLEE_SAVE_REGS_THUNK(xen_pgd_val);
/*
* Xen's PAT setup is part of its ABI, though I assume entries 6 & 7
* are reserved for now, to correspond to the Intel-reserved PAT
* types.
*
* We expect Linux's PAT set as follows:
*
* Idx PTE flags Linux Xen Default
* 0 WB WB WB
* 1 PWT WC WT WT
* 2 PCD UC- UC- UC-
* 3 PCD PWT UC UC UC
* 4 PAT WB WC WB
* 5 PAT PWT WC WP WT
* 6 PAT PCD UC- rsv UC-
* 7 PAT PCD PWT UC rsv UC
*/
void xen_set_pat(u64 pat)
{
/* We expect Linux to use a PAT setting of
* UC UC- WC WB (ignoring the PAT flag) */
WARN_ON(pat != 0x0007010600070106ull);
}
__visible pte_t xen_make_pte(pteval_t pte)
{
#if 0
/* If Linux is trying to set a WC pte, then map to the Xen WC.
* If _PAGE_PAT is set, then it probably means it is really
* _PAGE_PSE, so avoid fiddling with the PAT mapping and hope
* things work out OK...
*
* (We should never see kernel mappings with _PAGE_PSE set,
* but we could see hugetlbfs mappings, I think.).
*/
if (pat_enabled && !WARN_ON(pte & _PAGE_PAT)) {
if ((pte & (_PAGE_PCD | _PAGE_PWT)) == _PAGE_PWT)
pte = (pte & ~(_PAGE_PCD | _PAGE_PWT)) | _PAGE_PAT;
}
#endif
pte = pte_pfn_to_mfn(pte);
return native_make_pte(pte);