Re: [PATCH v3 6/9] KVM: PPC: Ultravisor: Restrict flush of the partition tlb cache

On Thu, Jun 06, 2019 at 04:39:04PM -0300, Murilo Opsfelder Araújo wrote:

Claudio Carvalho [off-list ref] writes:

quoted

From: Ram Pai <redacted>

Ultravisor is responsible for flushing the tlb cache, since it manages
the PATE entries. Hence skip tlb flush, if the ultravisor firmware is
available.

Signed-off-by: Ram Pai <redacted>
Signed-off-by: Claudio Carvalho <redacted>
---
 arch/powerpc/mm/book3s64/pgtable.c | 33 +++++++++++++++++-------------
 1 file changed, 19 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
index 40a9fc8b139f..1eeb5fe87023 100644
--- a/arch/powerpc/mm/book3s64/pgtable.c
+++ b/arch/powerpc/mm/book3s64/pgtable.c

@@ -224,6 +224,23 @@ void __init mmu_partition_table_init(void)
 	powernv_set_nmmu_ptcr(ptcr);
 }

+static void flush_partition(unsigned int lpid, unsigned long dw0)
+{
+	if (dw0 & PATB_HR) {
+		asm volatile(PPC_TLBIE_5(%0, %1, 2, 0, 1) : :
+			     "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
+		asm volatile(PPC_TLBIE_5(%0, %1, 2, 1, 1) : :
+			     "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
+		trace_tlbie(lpid, 0, TLBIEL_INVAL_SET_LPID, lpid, 2, 0, 1);
+	} else {
+		asm volatile(PPC_TLBIE_5(%0, %1, 2, 0, 0) : :
+			     "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
+		trace_tlbie(lpid, 0, TLBIEL_INVAL_SET_LPID, lpid, 2, 0, 0);
+	}
+	/* do we need fixup here ?*/
+	asm volatile("eieio; tlbsync; ptesync" : : : "memory");
+}
+

checkpatch.pl seems to complain:

ERROR: need consistent spacing around '%' (ctx:WxV)
#125: FILE: arch/powerpc/mm/book3s64/pgtable.c:230:
+               asm volatile(PPC_TLBIE_5(%0, %1, 2, 0, 1) : :
                                             ^

ERROR: need consistent spacing around '%' (ctx:WxV)
#127: FILE: arch/powerpc/mm/book3s64/pgtable.c:232:
+               asm volatile(PPC_TLBIE_5(%0, %1, 2, 1, 1) : :
                                             ^

ERROR: need consistent spacing around '%' (ctx:WxV)
#131: FILE: arch/powerpc/mm/book3s64/pgtable.c:236:
+               asm volatile(PPC_TLBIE_5(%0, %1, 2, 0, 0) : :
                                             ^

Then clearly checkpatch.pl has a bug.

Paul.