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| author |   Jan Beulich <jbeulich@suse.com> | 2021-09-30 14:34:56 +0200 |
|---|---|---|
| committer |   Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2021-11-02 07:45:43 -0500 |
| commit | dc4bd2a2ddafeffcdc33bb5c67a058d00885bb99 (patch) | |
| tree | 525814934bcff5315ec038887acbfc55e2f8b573 | |
| parent | Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 (diff) | |
| download | linux-dev-dc4bd2a2ddafeffcdc33bb5c67a058d00885bb99.tar.xz linux-dev-dc4bd2a2ddafeffcdc33bb5c67a058d00885bb99.zip | |
xen/x86: streamline set_pte_mfn()
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>
| -rw-r--r-- | arch/x86/xen/mmu_pv.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c index 1ce436eeda15..d2d6980c66b3 100644 --- a/arch/x86/xen/mmu_pv.c +++ b/arch/x86/xen/mmu_pv.c @@ -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) |