Messages in this thread | | | Date | Thu, 07 Mar 2019 03:45:54 -0700 | From | "Jan Beulich" <> | Subject | Re: [Xen-devel] [PATCH] xen: fix dom0 boot on huge systems |
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>>> On 07.03.19 at 10:11, <jgross@suse.com> wrote: > Commit f7c90c2aa40048 ("x86/xen: don't write ptes directly in 32-bit > PV guests") introduced a regression for booting dom0 on huge systems > with lots of RAM (in the TB range). > > Reason is that on those hosts the p2m list needs to be moved early in > the boot process and this requires temporary page tables to be created. > Said commit modified xen_set_pte_init() to use a hypercall for writing > a PTE, but this requires the page table being in the direct mapped > area, which is not the case for the temporary page tables used in > xen_relocate_p2m(). > > As the page tables are completely written before being linked to the > actual address space instead of set_pte() a plain write to memory can > be used in xen_relocate_p2m(). > > Fixes: f7c90c2aa40048 ("x86/xen: don't write ptes directly in 32-bit PV guests") > Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
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