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Commit f636c147 authored by Michael Ellerman's avatar Michael Ellerman
Browse files

powerpc/pseries: Set or clear security feature flags 



Now that we have feature flags for security related things, set or
clear them based on what we receive from the hypercall.

Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 9a868f63

arch/powerpc/platforms/pseries/setup.c

+43 −0
Original line number Diff line number Diff line
@@ -68,6 +68,7 @@ 
#include <asm/plpar_wrappers.h>

#include <asm/kexec.h>

#include <asm/isa-bridge.h>

#include <asm/security_features.h>



#include "pseries.h"
@@ -459,6 +460,40 @@ static void __init find_and_init_phbs(void) 
	of_pci_check_probe_only();

}



static void init_cpu_char_feature_flags(struct h_cpu_char_result *result)

{

	if (result->character & H_CPU_CHAR_SPEC_BAR_ORI31)

		security_ftr_set(SEC_FTR_SPEC_BAR_ORI31);



	if (result->character & H_CPU_CHAR_BCCTRL_SERIALISED)

		security_ftr_set(SEC_FTR_BCCTRL_SERIALISED);



	if (result->character & H_CPU_CHAR_L1D_FLUSH_ORI30)

		security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30);



	if (result->character & H_CPU_CHAR_L1D_FLUSH_TRIG2)

		security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2);



	if (result->character & H_CPU_CHAR_L1D_THREAD_PRIV)

		security_ftr_set(SEC_FTR_L1D_THREAD_PRIV);



	if (result->character & H_CPU_CHAR_COUNT_CACHE_DISABLED)

		security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED);



	/*

	 * The features below are enabled by default, so we instead look to see

	 * if firmware has *disabled* them, and clear them if so.

	 */

	if (!(result->character & H_CPU_BEHAV_FAVOUR_SECURITY))

		security_ftr_clear(SEC_FTR_FAVOUR_SECURITY);



	if (!(result->character & H_CPU_BEHAV_L1D_FLUSH_PR))

		security_ftr_clear(SEC_FTR_L1D_FLUSH_PR);



	if (!(result->character & H_CPU_BEHAV_BNDS_CHK_SPEC_BAR))

		security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);

}



void pseries_setup_rfi_flush(void)

{

	struct h_cpu_char_result result;
@@ -472,6 +507,8 @@ void pseries_setup_rfi_flush(void) 


	rc = plpar_get_cpu_characteristics(&result);

	if (rc == H_SUCCESS) {

		init_cpu_char_feature_flags(&result);



		if (result.character & H_CPU_CHAR_L1D_FLUSH_TRIG2)

			types |= L1D_FLUSH_MTTRIG;

		if (result.character & H_CPU_CHAR_L1D_FLUSH_ORI30)
@@ -482,6 +519,12 @@ void pseries_setup_rfi_flush(void) 
			enable = false;

	}



	/*

	 * We're the guest so this doesn't apply to us, clear it to simplify

	 * handling of it elsewhere.

	 */

	security_ftr_clear(SEC_FTR_L1D_FLUSH_HV);



	setup_rfi_flush(types, enable);

}