From: Michael Ellerman <mpe@ellerman.id.au>
To: linuxppc-dev@ozlabs.org
Cc: mauricfo@linux.vnet.ibm.com
Subject: [PATCH v2 07/10] powerpc/powernv: Use the security flags in pnv_setup_rfi_flush()
Date: Tue, 27 Mar 2018 23:01:50 +1100 [thread overview]
Message-ID: <20180327120153.31612-7-mpe@ellerman.id.au> (raw)
In-Reply-To: <20180327120153.31612-1-mpe@ellerman.id.au>
Now that we have the security flags we can significantly simplify the
code in pnv_setup_rfi_flush(), because we can use the flags instead of
checking device tree properties and because the security flags have
pessimistic defaults.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
arch/powerpc/platforms/powernv/setup.c | 41 +++++++++-------------------------
1 file changed, 10 insertions(+), 31 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 5f242b1bab01..a90e995e5cc1 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -66,7 +66,7 @@ static void init_fw_feat_flags(struct device_node *np)
if (fw_feature_is("enabled", "fw-bcctrl-serialized", np))
security_ftr_set(SEC_FTR_BCCTRL_SERIALISED);
- if (fw_feature_is("enabled", "inst-spec-barrier-ori31,31,0", np))
+ if (fw_feature_is("enabled", "inst-l1d-flush-ori30,30,0", np))
security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30);
if (fw_feature_is("enabled", "inst-l1d-flush-trig2", np))
@@ -99,11 +99,10 @@ static void pnv_setup_rfi_flush(void)
{
struct device_node *np, *fw_features;
enum l1d_flush_type type;
- int enable;
+ bool enable;
/* Default to fallback in case fw-features are not available */
type = L1D_FLUSH_FALLBACK;
- enable = 1;
np = of_find_node_by_name(NULL, "ibm,opal");
fw_features = of_get_child_by_name(np, "fw-features");
@@ -111,40 +110,20 @@ static void pnv_setup_rfi_flush(void)
if (fw_features) {
init_fw_feat_flags(fw_features);
+ of_node_put(fw_features);
- np = of_get_child_by_name(fw_features, "inst-l1d-flush-trig2");
- if (np && of_property_read_bool(np, "enabled"))
+ if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_TRIG2))
type = L1D_FLUSH_MTTRIG;
- of_node_put(np);
-
- np = of_get_child_by_name(fw_features, "inst-l1d-flush-ori30,30,0");
- if (np && of_property_read_bool(np, "enabled"))
+ if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_ORI30))
type = L1D_FLUSH_ORI;
-
- of_node_put(np);
-
- /* Enable unless firmware says NOT to */
- enable = 2;
- np = of_get_child_by_name(fw_features, "needs-l1d-flush-msr-hv-1-to-0");
- if (np && of_property_read_bool(np, "disabled"))
- enable--;
-
- of_node_put(np);
-
- np = of_get_child_by_name(fw_features, "needs-l1d-flush-msr-pr-0-to-1");
- if (np && of_property_read_bool(np, "disabled"))
- enable--;
-
- np = of_get_child_by_name(fw_features, "speculation-policy-favor-security");
- if (np && of_property_read_bool(np, "disabled"))
- enable = 0;
-
- of_node_put(np);
- of_node_put(fw_features);
}
- setup_rfi_flush(type, enable > 0);
+ enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \
+ (security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR) || \
+ security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV));
+
+ setup_rfi_flush(type, enable);
}
static void __init pnv_setup_arch(void)
--
2.14.1
next prev parent reply other threads:[~2018-03-27 12:02 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-27 12:01 [PATCH v2 01/10] powerpc: Add security feature flags for Spectre/Meltdown Michael Ellerman
2018-03-27 12:01 ` [PATCH v2 02/10] powerpc/pseries: Add new H_GET_CPU_CHARACTERISTICS flags Michael Ellerman
2018-03-27 12:01 ` [PATCH v2 03/10] powerpc/pseries: Set or clear security feature flags Michael Ellerman
2018-03-29 18:35 ` Mauricio Faria de Oliveira
2018-03-27 12:01 ` [PATCH v2 04/10] powerpc/powernv: " Michael Ellerman
2018-03-27 12:01 ` [PATCH v2 05/10] powerpc/64s: Move cpu_show_meltdown() Michael Ellerman
2018-03-27 12:01 ` [PATCH v2 06/10] powerpc/64s: Enhance the information in cpu_show_meltdown() Michael Ellerman
2018-03-27 12:01 ` Michael Ellerman [this message]
2018-03-27 12:01 ` [PATCH v2 08/10] powerpc/pseries: Use the security flags in pseries_setup_rfi_flush() Michael Ellerman
2018-03-27 12:01 ` [PATCH v2 09/10] powerpc/64s: Wire up cpu_show_spectre_v1() Michael Ellerman
2018-03-27 12:01 ` [PATCH v2 10/10] powerpc/64s: Wire up cpu_show_spectre_v2() Michael Ellerman
2018-03-27 12:36 ` T T
2018-03-28 9:15 ` Diana Madalina Craciun
2018-03-27 13:42 ` [PATCH v2 01/10] powerpc: Add security feature flags for Spectre/Meltdown Gabriel Paubert
2018-03-28 14:13 ` [v2, " Michael Ellerman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180327120153.31612-7-mpe@ellerman.id.au \
--to=mpe@ellerman.id.au \
--cc=linuxppc-dev@ozlabs.org \
--cc=mauricfo@linux.vnet.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox