korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-30 07:34:12 +08:00
Code Issues Packages Projects Releases Wiki Activity

Third set of PPC KVM fixes for 4.19

Browse Source 
One patch here, fixing a potential host crash introduced (or at least
 exacerbated) by a previous fix for corruption relating to radix guest
 page faults and THP operations.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2
 
 iQEcBAABCAAGBQJbtq7FAAoJEJ2a6ncsY3Gf0PAIAJvq2veNJs0HHsonuI592mK0
 YMKL7IproGHBnIuVvpaI3o6iERjMtRaolh+G4dlk3xoQ/TXYzTdimT1cwF2jZblL
 wQSsit5499UrJdPsFxBc7lc8yXwRR9+N/ooRAQS/TyK6w00Y+Aep7sTQpRdVCb1G
 nskLWXBDWtdB6nGAX9dECpRQP+/voxEJkMMrsFM3rYbBkM/rOqu/IXsCoH2u2jGM
 6zFDe7Z35VP77UaehK9W4fGHVc+92oD5E2kN56DNIotYaAT7fudPmNQF+g1GsVFc
 Mv8AJdXiQIhZFbpRWTS/UTvyb/aq1Ou6Xd5msTYTMG8v+g0M9h8ZSH3FQCX8RMs=
 =Fdit
 -----END PGP SIGNATURE-----

Merge tag 'kvm-ppc-fixes-4.19-3' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into kvm-master

Third set of PPC KVM fixes for 4.19

One patch here, fixing a potential host crash introduced (or at least
exacerbated) by a previous fix for corruption relating to radix guest
page faults and THP operations.
This commit is contained in:
Paolo Bonzini 2018-10-05 09:39:53 +02:00
commit cc906f07d7
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/powerpc/kvm/book3s_64_mmu_radix.c
View File

@ -646,6 +646,16 @@ int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
*/
local_irq_disable();
ptep = __find_linux_pte(vcpu->arch.pgdir, hva, NULL, &shift);
/*
* If the PTE disappeared temporarily due to a THP
* collapse, just return and let the guest try again.
*/
if (!ptep) {
local_irq_enable();
if (page)
put_page(page);
return RESUME_GUEST;
}
pte = *ptep;
local_irq_enable();