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xen/x86: streamline set_pte_mfn()

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In preparation for restoring xen_set_pte_init()'s original behavior of
avoiding hypercalls, make set_pte_mfn() no longer use the standard
set_pte() code path. That one is more complicated than the alternative
of simply using an available hypercall directly. This way we can avoid
introducing a fair number (2k on my test system) of cases where the
hypervisor would trap-and-emulate page table updates.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/b39c08e8-4a53-8bca-e6e7-3684a6cab8d0@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Jan Beulich 2021-09-30 14:34:56 +02:00 • committed by Boris Ostrovsky
parent bfc484fe6a
commit dc4bd2a2dd
1 changed files with 4 additions and 2 deletions
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6
arch/x86/xen/mmu_pv.c
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@ -241,9 +241,11 @@ static void xen_set_pmd(pmd_t *ptr, pmd_t val)
* Associate a virtual page frame with a given physical page frame
* and protection flags for that frame.
*/
void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
void __init set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
{
set_pte_vaddr(vaddr, mfn_pte(mfn, flags));
if (HYPERVISOR_update_va_mapping(vaddr, mfn_pte(mfn, flags),
UVMF_INVLPG))
BUG();
}
static bool xen_batched_set_pte(pte_t *ptep, pte_t pteval)