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powerpc/64s/pseries: Fix hash tlbiel_all_isa300 for guest kernels 

tlbiel_all() can not be usable in !HVMODE when running hash presently,
remove HV privileged flushes when running in guest to make it usable.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201126102530.691335-3-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2020-11-26 20:25:28 +10:00 committed by Michael Ellerman
parent 5844cc25fd
commit c0b27c517a
1 changed files with 14 additions and 7 deletions
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21
arch/powerpc/mm/book3s64/hash_native.c
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@ -92,16 +92,15 @@ static void tlbiel_all_isa300(unsigned int num_sets, unsigned int is)
asm volatile("ptesync": : :"memory");
/*
* Flush the first set of the TLB, and any caching of partition table
* entries. Then flush the remaining sets of the TLB. Hash mode uses
* partition scoped TLB translations.
* Flush the partition table cache if this is HV mode.
*/
tlbiel_hash_set_isa300(0, is, 0, 2, 0);
for (set = 1; set < num_sets; set++)
tlbiel_hash_set_isa300(set, is, 0, 0, 0);
if (early_cpu_has_feature(CPU_FTR_HVMODE))
tlbiel_hash_set_isa300(0, is, 0, 2, 0);
/*
* Now invalidate the process table cache.
* Now invalidate the process table cache. UPRT=0 HPT modes (what
* current hardware implements) do not use the process table, but
* add the flushes anyway.
*
* From ISA v3.0B p. 1078:
* The following forms are invalid.
@ -110,6 +109,14 @@ static void tlbiel_all_isa300(unsigned int num_sets, unsigned int is)
*/
tlbiel_hash_set_isa300(0, is, 0, 2, 1);
/*
* Then flush the sets of the TLB proper. Hash mode uses
* partition scoped TLB translations, which may be flushed
* in !HV mode.
*/
for (set = 0; set < num_sets; set++)
tlbiel_hash_set_isa300(set, is, 0, 0, 0);
ppc_after_tlbiel_barrier();
asm volatile(PPC_ISA_3_0_INVALIDATE_ERAT "; isync" : : :"memory");