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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>
This commit is contained in:
Nicholas Piggin 2018-05-18 03:49:43 +10:00 committed by Paul Mackerras
parent 878cf2bb2d
commit eadce3b48b
1 changed files with 2 additions and 0 deletions
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2
arch/powerpc/kvm/book3s_hv_rmhandlers.S
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@ -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