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target/s390x: Improve heuristic for ipte 

If only the page index is set, most likely we don't have a valid
virtual address. Let's do a full tlb flush for that case.

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170622094151.28633-3-david@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
David Hildenbrand 2017-06-22 11:41:50 +02:00 committed by Richard Henderson
parent faf1c63d34
commit 97b95aae3b
1 changed files with 16 additions and 9 deletions
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25
target/s390x/mem_helper.c
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@ -1630,16 +1630,23 @@ void HELPER(ipte)(CPUS390XState *env, uint64_t pto, uint64_t vaddr,
/* XXX we exploit the fact that Linux passes the exact virtual
address here - it's not obliged to! */
if (m4 & 1) {
tlb_flush_page(cs, page);
if (vaddr & ~VADDR_PX) {
tlb_flush_page(cs, page);
/* XXX 31-bit hack */
tlb_flush_page(cs, page ^ 0x80000000);
} else {
/* looks like we don't have a valid virtual address */
tlb_flush(cs);
}
} else {
tlb_flush_page_all_cpus_synced(cs, page);
}
/* XXX 31-bit hack */
if (m4 & 1) {
tlb_flush_page(cs, page ^ 0x80000000);
} else {
tlb_flush_page_all_cpus_synced(cs, page ^ 0x80000000);
if (vaddr & ~VADDR_PX) {
tlb_flush_page_all_cpus_synced(cs, page);
/* XXX 31-bit hack */
tlb_flush_page_all_cpus_synced(cs, page ^ 0x80000000);
} else {
/* looks like we don't have a valid virtual address */
tlb_flush_all_cpus_synced(cs);
}
}
}