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| author | Jan Beulich <jbeulich@suse.com> | 2021-09-30 14:37:19 +0200 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2021-11-02 13:45:43 +0100 |
| commit | 9a58b352e9e8a8c897acf6aae5cacd7d481965f9 (patch) | |
| tree | 3dcf7374de6f84ae997c148bcc2c13c408a48057 /arch | |
| parent | xen/x86: there's no highmem anymore in PV mode (diff) | |
| download | linux-9a58b352e9e8a8c897acf6aae5cacd7d481965f9.tar.xz linux-9a58b352e9e8a8c897acf6aae5cacd7d481965f9.zip | |
xen/x86: restrict PV Dom0 identity mapping
When moving away RAM pages, there having been a mapping of those is not
a proper indication that instead MMIO should be mapped there. At the
point in time this effectively covers the low megabyte only. Mapping of
that is, however, the job of init_mem_mapping(). Comparing the two one
can also spot that we've been wrongly (or at least inconsistently) using
PAGE_KERNEL_IO here.
Simply zap any such mappings instead.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/038b8c02-3621-d66a-63ae-982ccf67ae88@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/xen/setup.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index c1eba7e1d242..b5a6c2031f6e 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -425,13 +425,13 @@ static unsigned long __init xen_set_identity_and_remap_chunk( } /* - * If the PFNs are currently mapped, the VA mapping also needs - * to be updated to be 1:1. + * If the PFNs are currently mapped, their VA mappings need to be + * zapped. */ for (pfn = start_pfn; pfn <= max_pfn_mapped && pfn < end_pfn; pfn++) (void)HYPERVISOR_update_va_mapping( (unsigned long)__va(pfn << PAGE_SHIFT), - mfn_pte(pfn, PAGE_KERNEL_IO), 0); + native_make_pte(0), 0); return remap_pfn; } |