diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2021-11-23 12:51:43 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-11-24 13:08:57 +0300 |
| commit | 9581991a60817abe311c2581ae4554b28bfa32f1 (patch) | |
| tree | c5766a37f856a44f1077b87093771c0d9b3e87ad /arch/powerpc/kvm/book3s_hv_p9_entry.c | |
| parent | 4ebbd075bcde7884e078d4360510b989f559bfec (diff) | |
| download | linux-9581991a60817abe311c2581ae4554b28bfa32f1.tar.xz | |
KVM: PPC: Book3S HV P9: Use large decrementer for HDEC
On processors that don't suppress the HDEC exceptions when LPCR[HDICE]=0,
this could help reduce needless guest exits due to leftover exceptions on
entering the guest.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-6-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_p9_entry.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_p9_entry.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_p9_entry.c b/arch/powerpc/kvm/book3s_hv_p9_entry.c index 961b3d70483c..0ff9ddb5e7ca 100644 --- a/arch/powerpc/kvm/book3s_hv_p9_entry.c +++ b/arch/powerpc/kvm/book3s_hv_p9_entry.c @@ -504,7 +504,8 @@ tm_return_to_guest: vc->tb_offset_applied = 0; } - mtspr(SPRN_HDEC, 0x7fffffff); + /* HDEC must be at least as large as DEC, so decrementer_max fits */ + mtspr(SPRN_HDEC, decrementer_max); save_clear_guest_mmu(kvm, vcpu); switch_mmu_to_host(kvm, host_pidr); |