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s390x/mmu: Implement Instruction-Execution-Protection Facility

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IEP support in the mmu is fairly easy. Set the right permissions for TLB
entries and properly report an exception.

Make sure to handle EDAT-2 by setting bit 56/60/61 of the TEID (TEC) to
the right values.

Let's keep s390_cpu_get_phys_page_debug() working even if IEP is
active. Switch MMU_DATA_LOAD - this has no other effects any more as the
ASC to be used is now fully selected outside of mmu_translate().

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
David Hildenbrand 2018-01-15 00:29:22 +01:00
parent 3dc29061f3
commit 3a06f98192
3 changed files with 27 additions and 1 deletions
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6
target/s390x/helper.c
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@ -63,7 +63,11 @@ hwaddr s390_cpu_get_phys_page_debug(CPUState *cs, vaddr vaddr)
asc = PSW_ASC_PRIMARY;
}
if (mmu_translate(env, vaddr, MMU_INST_FETCH, asc, &raddr, &prot, false)) {
/*
* We want to read code even if IEP is active. Use MMU_DATA_LOAD instead
* of MMU_INST_FETCH.
*/
if (mmu_translate(env, vaddr, MMU_DATA_LOAD, asc, &raddr, &prot, false)) {
return -1;
}
return raddr;