diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-05-15 06:46:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-05-15 06:46:03 -0700 |
| commit | bc403203d65a874df2f3156046468052e4109cb0 (patch) | |
| tree | e25fa8b9f8addce1521754c1eca4f7a4ae2b2e81 /arch | |
| parent | 79dc4fc2f235159f0f59fca2250855a796f590ff (diff) | |
| parent | ee8348496c77e3737d0a6cda307a521f2cff954f (diff) | |
Merge tag 'powerpc-5.18-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fix from Michael Ellerman:
- Fix KVM PR on 32-bit, which was broken by some MMU code refactoring.
Thanks to: Alexander Graf, and Matt Evans.
* tag 'powerpc-5.18-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
KVM: PPC: Book3S PR: Enable MSR_DR for switch_mmu_context()
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kvm/book3s_32_sr.S | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/arch/powerpc/kvm/book3s_32_sr.S b/arch/powerpc/kvm/book3s_32_sr.S index e3ab9df6cf19..6cfcd20d4668 100644 --- a/arch/powerpc/kvm/book3s_32_sr.S +++ b/arch/powerpc/kvm/book3s_32_sr.S @@ -122,11 +122,27 @@ /* 0x0 - 0xb */ - /* 'current->mm' needs to be in r4 */ - tophys(r4, r2) - lwz r4, MM(r4) - tophys(r4, r4) - /* This only clobbers r0, r3, r4 and r5 */ + /* switch_mmu_context() needs paging, let's enable it */ + mfmsr r9 + ori r11, r9, MSR_DR + mtmsr r11 + sync + + /* switch_mmu_context() clobbers r12, rescue it */ + SAVE_GPR(12, r1) + + /* Calling switch_mmu_context(<inv>, current->mm, <inv>); */ + lwz r4, MM(r2) bl switch_mmu_context + /* restore r12 */ + REST_GPR(12, r1) + + /* Disable paging again */ + mfmsr r9 + li r6, MSR_DR + andc r9, r9, r6 + mtmsr r9 + sync + .endm |