| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 050/107] powerpc/fsl: Flush branch predictor when entering KVM | Date | Mon, 1 Apr 2019 19:02:05 +0200 |
| |
4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Diana Craciun <diana.craciun@nxp.com>
commit e7aa61f47b23afbec41031bc47ca8d6cb6516abc upstream.
Switching from the guest to host is another place where the speculative accesses can be exploited. Flush the branch predictor when entering KVM.
Signed-off-by: Diana Craciun <diana.craciun@nxp.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/powerpc/kvm/bookehv_interrupts.S | 4 ++++ 1 file changed, 4 insertions(+)
--- a/arch/powerpc/kvm/bookehv_interrupts.S +++ b/arch/powerpc/kvm/bookehv_interrupts.S @@ -75,6 +75,10 @@ PPC_LL r1, VCPU_HOST_STACK(r4) PPC_LL r2, HOST_R2(r1) +START_BTB_FLUSH_SECTION + BTB_FLUSH(r10) +END_BTB_FLUSH_SECTION + mfspr r10, SPRN_PID lwz r8, VCPU_HOST_PID(r4) PPC_LL r11, VCPU_SHARED(r4)
|