KVM: PPC: Book3S HV: Fix kvmppc_bad_host_intr for real mode interrupts

When CONFIG_RELOCATABLE=n, the Linux real mode interrupt handlers call
into KVM using real address. This needs to be translated to the kernel
linear effective address before the MMU is switched on.

kvmppc_bad_host_intr misses adding these bits, so when it is used to
handle a system reset interrupt (that always gets delivered in real
mode), it results in an instruction access fault immediately after
the MMU is turned on.

Fix this by ensuring the top 2 address bits are set when the MMU is
turned on.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index ef9e665..5e6e493 100644 (file)
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -3568,6 +3568,8 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_RADIX)
        bcl     20, 31, .+4
 5:     mflr    r3
        addi    r3, r3, 9f - 5b
+       li      r4, -1
+       rldimi  r3, r4, 62, 0   /* ensure 0xc000000000000000 bits are set */
        ld      r4, PACAKMSR(r13)
        mtspr   SPRN_SRR0, r3
        mtspr   SPRN_SRR1, r4