Copypasta from rfi implementation
Signed-off-by: Michal Suchanek <msucha...@suse.de>
---
arch/powerpc/platforms/pseries/setup.c | 38 ++++++++++++++++++++++------------
1 file changed, 25 insertions(+), 13 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/setup.c
b/arch/powerpc/platforms/pseries/setup.c
index 1a527625acf7..b779ddb8e250 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -459,38 +459,50 @@ static void __init find_and_init_phbs(void)
of_pci_check_probe_only();
}
-static void pseries_setup_rfi_flush(void)
+static void pseries_setup_rfi_nospec(void)
{
struct h_cpu_char_result result;
- enum l1d_flush_type types;
- bool enable;
+ enum l1d_flush_type flush_types;
+ enum spec_barrier_type barrier_type;
+ bool flush_enable;
+ bool barrier_enable;
long rc;
/* Enable by default */
- enable = true;
+ flush_enable = true;
+ barrier_enable = true;
+ /* no fallback if the firmware does not tell us */
+ barrier_type = SPEC_BARRIER_NONE;
rc = plpar_get_cpu_characteristics(&result);
if (rc == H_SUCCESS) {
- types = L1D_FLUSH_NONE;
+ flush_types = L1D_FLUSH_NONE;
if (result.character & H_CPU_CHAR_L1D_FLUSH_TRIG2)
- types |= L1D_FLUSH_MTTRIG;
+ flush_types |= L1D_FLUSH_MTTRIG;
if (result.character & H_CPU_CHAR_L1D_FLUSH_ORI30)
- types |= L1D_FLUSH_ORI;
+ flush_types |= L1D_FLUSH_ORI;
+ if (result.character & H_CPU_CHAR_SPEC_BAR_ORI31)
+ barrier_type |= SPEC_BARRIER_ORI;
/* Use fallback if nothing set in hcall */
- if (types == L1D_FLUSH_NONE)
- types = L1D_FLUSH_FALLBACK;
+ if (flush_types == L1D_FLUSH_NONE)
+ flush_types = L1D_FLUSH_FALLBACK;
if ((!(result.behaviour & H_CPU_BEHAV_L1D_FLUSH_PR)) ||
(!(result.behaviour & H_CPU_BEHAV_FAVOUR_SECURITY)))
- enable = false;
+ flush_enable = false;
+
+ if ((!(result.behaviour & H_CPU_BEHAV_BNDS_CHK_SPEC_BAR)) ||
+ (!(result.behaviour & H_CPU_BEHAV_FAVOUR_SECURITY)))
+ barrier_enable = false;
} else {
/* Default to fallback if case hcall is not available */
- types = L1D_FLUSH_FALLBACK;
+ flush_types = L1D_FLUSH_FALLBACK;
}
- setup_rfi_flush(types, enable);
+ setup_barrier_nospec(barrier_type, barrier_enable);
+ setup_rfi_flush(flush_types, flush_enable);
}
#ifdef CONFIG_PCI_IOV
@@ -666,7 +678,7 @@ static void __init pSeries_setup_arch(void)
fwnmi_init();
- pseries_setup_rfi_flush();
+ pseries_setup_rfi_nospec();
/* By default, only probe PCI (can be overridden by rtas_pci) */
pci_add_flags(PCI_PROBE_ONLY);
--
2.13.6
