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Commit c610d65c authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
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powerpc/pseries: lift RTAS limit for hash 



With the previous patch to switch to 64-bit mode after returning from
RTAS and before doing any memory accesses, the RMA limit need not be
clamped to 1GB to avoid RTAS bugs.

Keep the 1GB limit for older firmware (although this is more of a kernel
concern than RTAS), and remove it starting with POWER9.

Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 5eae82ca

arch/powerpc/mm/hash_utils_64.c

+5 −3
Original line number Diff line number Diff line
@@ -1853,11 +1853,13 @@ void hash__setup_initial_memory_limit(phys_addr_t first_memblock_base, 
	 * non-virtualized 64-bit hash MMU systems don't have a limitation

	 * on real mode access.

	 *

	 * We also clamp it to 1G to avoid some funky things

	 * such as RTAS bugs etc...

	 * For guests on platforms before POWER9, we clamp the it limit to 1G

	 * to avoid some funky things such as RTAS bugs etc...

	 */

	if (!early_cpu_has_feature(CPU_FTR_HVMODE)) {

		ppc64_rma_size = min_t(u64, first_memblock_size, 0x40000000);

		ppc64_rma_size = first_memblock_size;

		if (!early_cpu_has_feature(CPU_FTR_ARCH_300))

			ppc64_rma_size = min_t(u64, ppc64_rma_size, 0x40000000);



		/* Finally limit subsequent allocations */

		memblock_set_current_limit(ppc64_rma_size);