diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2021-11-23 19:52:17 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-11-24 21:09:01 +1100 |
| commit | cf3b16cfa6503b1fe5e680f9711262e6a51ef097 (patch) | |
| tree | dcb79e025bb6667dbd17750608ed1062c88cbb48 /arch/powerpc/kvm/book3s_64_mmu_radix.c | |
| parent | 5236756d04454c7ce9f45e27b434d75b8d6f8759 (diff) | |
KVM: PPC: Book3S HV P9: Comment and fix MMU context switching code
Tighten up partition switching code synchronisation and comments.
In particular, hwsync ; isync is required after the last access that is
performed in the context of a partition, before the partition is
switched away from.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-40-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kvm/book3s_64_mmu_radix.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_mmu_radix.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c index 16359525a40f..8cebe5542256 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -57,6 +57,8 @@ unsigned long __kvmhv_copy_tofrom_guest_radix(int lpid, int pid, preempt_disable(); + asm volatile("hwsync" ::: "memory"); + isync(); /* switch the lpid first to avoid running host with unallocated pid */ old_lpid = mfspr(SPRN_LPID); if (old_lpid != lpid) @@ -75,6 +77,8 @@ unsigned long __kvmhv_copy_tofrom_guest_radix(int lpid, int pid, ret = __copy_to_user_inatomic((void __user *)to, from, n); pagefault_enable(); + asm volatile("hwsync" ::: "memory"); + isync(); /* switch the pid first to avoid running host with unallocated pid */ if (quadrant == 1 && pid != old_pid) mtspr(SPRN_PID, old_pid); |