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Commit 84749a58 authored by Michael Ellerman's avatar Michael Ellerman
Browse files

powerpc/rfi-flush: Always enable fallback flush on pseries 



This ensures the fallback flush area is always allocated on pseries,
so in case a LPAR is migrated from a patched to an unpatched system,
it is possible to enable the fallback flush in the target system.

Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: default avatarMauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent abf110f3

arch/powerpc/platforms/pseries/setup.c

+1 −9
Original line number Diff line number Diff line
@@ -468,26 +468,18 @@ static void pseries_setup_rfi_flush(void) 


	/* Enable by default */

	enable = true;

	types = L1D_FLUSH_FALLBACK;



	rc = plpar_get_cpu_characteristics(&result);

	if (rc == H_SUCCESS) {

		types = L1D_FLUSH_NONE;



		if (result.character & H_CPU_CHAR_L1D_FLUSH_TRIG2)

			types |= L1D_FLUSH_MTTRIG;

		if (result.character & H_CPU_CHAR_L1D_FLUSH_ORI30)

			types |= L1D_FLUSH_ORI;



		/* Use fallback if nothing set in hcall */

		if (types == L1D_FLUSH_NONE)

			types = L1D_FLUSH_FALLBACK;



		if ((!(result.behaviour & H_CPU_BEHAV_L1D_FLUSH_PR)) ||

		    (!(result.behaviour & H_CPU_BEHAV_FAVOUR_SECURITY)))

			enable = false;

	} else {

		/* Default to fallback if case hcall is not available */

		types = L1D_FLUSH_FALLBACK;

	}



	setup_rfi_flush(types, enable);