github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-04 12:35:52 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

KVM: x86/mmu: Don't zero-allocate page table used for splitting a hugepage

Browse Source 
When splitting hugepages in the TDP MMU, don't zero the new page table on
allocation since tdp_mmu_split_huge_page() is guaranteed to write every
entry and thus every byte.

Unless someone peeks at the memory between allocating the page table and
writing the child SPTEs, no functional change intended.

Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Kai Huang <kai.huang@intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Link: https://patch.msgid.link/20260218210820.2828896-1-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2026-02-18 13:08:20 -08:00
parent 1450ab0810
commit ecb8062932
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kvm/mmu/tdp_mmu.c
View File

@ -1507,7 +1507,7 @@ static struct kvm_mmu_page *tdp_mmu_alloc_sp_for_split(void)
if (!sp)
return NULL;
sp->spt = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT);
sp->spt = (void *)__get_free_page(GFP_KERNEL_ACCOUNT);
if (!sp->spt) {
kmem_cache_free(mmu_page_header_cache, sp);
return NULL;