KVM: PPC: Book3S HV: Sanitize special-purpose register values on guest exit

[ Upstream commit ccec44563b18a0ce90e2d4f332784b3cb25c8e9c ]

Thomas Huth discovered that a guest could cause a hard hang of a
host CPU by setting the Instruction Authority Mask Register (IAMR)
to a suitable value.  It turns out that this is because when the
code was added to context-switch the new special-purpose registers
(SPRs) that were added in POWER8, we forgot to add code to ensure
that they were restored to a sane value on guest exit.

This adds code to set those registers where a bad value could
compromise the execution of the host kernel to a suitable neutral
value on guest exit.

Cc: stable@vger.kernel.org # v3.14+
Fixes: b005255e12a3
Reported-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index f8338e6d3dd782bb04b97cb5801ecbd4b29e4284..a34e43eec65835648a64085e5f9ea37253f0b86c 100644 (file)
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -1273,6 +1273,20 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
        std     r6, VCPU_ACOP(r9)
        stw     r7, VCPU_GUEST_PID(r9)
        std     r8, VCPU_WORT(r9)
+       /*
+        * Restore various registers to 0, where non-zero values
+        * set by the guest could disrupt the host.
+        */
+       li      r0, 0
+       mtspr   SPRN_IAMR, r0
+       mtspr   SPRN_CIABR, r0
+       mtspr   SPRN_DAWRX, r0
+       mtspr   SPRN_TCSCR, r0
+       mtspr   SPRN_WORT, r0
+       /* Set MMCRS to 1<<31 to freeze and disable the SPMC counters */
+       li      r0, 1
+       sldi    r0, r0, 31
+       mtspr   SPRN_MMCRS, r0
 8:
 
        /* Save and reset AMR and UAMOR before turning on the MMU */