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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2018-04-25 22:04:24 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-22 18:54:02 +0200
commit716bfae3b3f40de8c0a6ae83f199d96fd152b3cc (patch)
tree2434ad450b0f9644b9907a293721828298d8e1e3
parentfa2f1c65246d956106fa964cf0ed953162af88e5 (diff)
x86/bugs/AMD: Add support to disable RDS on Fam[15,16,17]h if requested
commit 764f3c21588a059cd783c6ba0734d4db2d72822d upstream AMD does not need the Speculative Store Bypass mitigation to be enabled. The parameters for this are already available and can be done via MSR C001_1020. Each family uses a different bit in that MSR for this. [ tglx: Expose the bit mask via a variable and move the actual MSR fiddling into the bugs code as that's the right thing to do and also required to prepare for dynamic enable/disable ] Suggested-by: Borislav Petkov <bp@suse.de> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/x86/include/asm/cpufeatures.h1
-rw-r--r--arch/x86/include/asm/nospec-branch.h4
-rw-r--r--arch/x86/kernel/cpu/amd.c26
-rw-r--r--arch/x86/kernel/cpu/bugs.c27
-rw-r--r--arch/x86/kernel/cpu/common.c4
5 files changed, 61 insertions, 1 deletions
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 5ec16bce8590..b86a18e570d9 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -213,6 +213,7 @@
#define X86_FEATURE_USE_IBPB ( 7*32+21) /* "" Indirect Branch Prediction Barrier enabled */
#define X86_FEATURE_USE_IBRS_FW ( 7*32+22) /* "" Use IBRS during runtime firmware calls */
#define X86_FEATURE_SPEC_STORE_BYPASS_DISABLE ( 7*32+23) /* "" Disable Speculative Store Bypass. */
+#define X86_FEATURE_AMD_RDS (7*32+24) /* "" AMD RDS implementation */
/* Virtualization flags: Linux defined, word 8 */
#define X86_FEATURE_TPR_SHADOW ( 8*32+ 0) /* Intel TPR Shadow */
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 7b9eacfc03f3..3a1541cf32de 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -244,6 +244,10 @@ enum ssb_mitigation {
SPEC_STORE_BYPASS_DISABLE,
};
+/* AMD specific Speculative Store Bypass MSR data */
+extern u64 x86_amd_ls_cfg_base;
+extern u64 x86_amd_ls_cfg_rds_mask;
+
extern char __indirect_thunk_start[];
extern char __indirect_thunk_end[];
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index e7d5a7883632..f18be6184630 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -10,6 +10,7 @@
#include <asm/processor.h>
#include <asm/apic.h>
#include <asm/cpu.h>
+#include <asm/nospec-branch.h>
#include <asm/smp.h>
#include <asm/pci-direct.h>
#include <asm/delay.h>
@@ -554,6 +555,26 @@ static void bsp_init_amd(struct cpuinfo_x86 *c)
rdmsrl(MSR_FAM10H_NODE_ID, value);
nodes_per_socket = ((value >> 3) & 7) + 1;
}
+
+ if (c->x86 >= 0x15 && c->x86 <= 0x17) {
+ unsigned int bit;
+
+ switch (c->x86) {
+ case 0x15: bit = 54; break;
+ case 0x16: bit = 33; break;
+ case 0x17: bit = 10; break;
+ default: return;
+ }
+ /*
+ * Try to cache the base value so further operations can
+ * avoid RMW. If that faults, do not enable RDS.
+ */
+ if (!rdmsrl_safe(MSR_AMD64_LS_CFG, &x86_amd_ls_cfg_base)) {
+ setup_force_cpu_cap(X86_FEATURE_RDS);
+ setup_force_cpu_cap(X86_FEATURE_AMD_RDS);
+ x86_amd_ls_cfg_rds_mask = 1ULL << bit;
+ }
+ }
}
static void early_init_amd(struct cpuinfo_x86 *c)
@@ -872,6 +893,11 @@ static void init_amd(struct cpuinfo_x86 *c)
/* AMD CPUs don't reset SS attributes on SYSRET, Xen does. */
if (!cpu_has(c, X86_FEATURE_XENPV))
set_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
+
+ if (boot_cpu_has(X86_FEATURE_AMD_RDS)) {
+ set_cpu_cap(c, X86_FEATURE_RDS);
+ set_cpu_cap(c, X86_FEATURE_AMD_RDS);
+ }
}
#ifdef CONFIG_X86_32
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index d809d398675a..86cdf635636d 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -41,6 +41,13 @@ static u64 __ro_after_init x86_spec_ctrl_base;
*/
static u64 __ro_after_init x86_spec_ctrl_mask = ~SPEC_CTRL_IBRS;
+/*
+ * AMD specific MSR info for Speculative Store Bypass control.
+ * x86_amd_ls_cfg_rds_mask is initialized in identify_boot_cpu().
+ */
+u64 __ro_after_init x86_amd_ls_cfg_base;
+u64 __ro_after_init x86_amd_ls_cfg_rds_mask;
+
void __init check_bugs(void)
{
identify_boot_cpu();
@@ -52,7 +59,8 @@ void __init check_bugs(void)
/*
* Read the SPEC_CTRL MSR to account for reserved bits which may
- * have unknown values.
+ * have unknown values. AMD64_LS_CFG MSR is cached in the early AMD
+ * init code as it is not enumerated and depends on the family.
*/
if (boot_cpu_has(X86_FEATURE_IBRS))
rdmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base);
@@ -154,6 +162,14 @@ void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl)
}
EXPORT_SYMBOL_GPL(x86_spec_ctrl_restore_host);
+static void x86_amd_rds_enable(void)
+{
+ u64 msrval = x86_amd_ls_cfg_base | x86_amd_ls_cfg_rds_mask;
+
+ if (boot_cpu_has(X86_FEATURE_AMD_RDS))
+ wrmsrl(MSR_AMD64_LS_CFG, msrval);
+}
+
#ifdef RETPOLINE
static bool spectre_v2_bad_module;
@@ -443,6 +459,11 @@ static enum ssb_mitigation_cmd __init __ssb_select_mitigation(void)
switch (cmd) {
case SPEC_STORE_BYPASS_CMD_AUTO:
+ /*
+ * AMD platforms by default don't need SSB mitigation.
+ */
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+ break;
case SPEC_STORE_BYPASS_CMD_ON:
mode = SPEC_STORE_BYPASS_DISABLE;
break;
@@ -469,6 +490,7 @@ static enum ssb_mitigation_cmd __init __ssb_select_mitigation(void)
x86_spec_ctrl_set(SPEC_CTRL_RDS);
break;
case X86_VENDOR_AMD:
+ x86_amd_rds_enable();
break;
}
}
@@ -490,6 +512,9 @@ void x86_spec_ctrl_setup_ap(void)
{
if (boot_cpu_has(X86_FEATURE_IBRS))
x86_spec_ctrl_set(x86_spec_ctrl_base & ~x86_spec_ctrl_mask);
+
+ if (ssb_mode == SPEC_STORE_BYPASS_DISABLE)
+ x86_amd_rds_enable();
}
#ifdef CONFIG_SYSFS
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 584110774aad..6e990e0436c6 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -910,6 +910,10 @@ static const __initconst struct x86_cpu_id cpu_no_spec_store_bypass[] = {
{ X86_VENDOR_CENTAUR, 5, },
{ X86_VENDOR_INTEL, 5, },
{ X86_VENDOR_NSC, 5, },
+ { X86_VENDOR_AMD, 0x12, },
+ { X86_VENDOR_AMD, 0x11, },
+ { X86_VENDOR_AMD, 0x10, },
+ { X86_VENDOR_AMD, 0xf, },
{ X86_VENDOR_ANY, 4, },
{}
};