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arm64: Get rid of __smccc_workaround_1_hvc_*

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[ Upstream commit 22765f30db ]

The very existence of __smccc_workaround_1_hvc_* is a thinko, as
KVM will never use a HVC call to perform the branch prediction
invalidation. Even as a nested hypervisor, it would use an SMC
instruction.

Let's get rid of it.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marc Zyngier
2019-10-29 09:17:23 +01:00
committed by Greg Kroah-Hartman
parent 31ee977f70
commit 36e5ae4d22
2 changed files with 5 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/arm64/kernel/bpi.S
+2 -10
View File
@@ -56,21 +56,13 @@ ENTRY(__bp_harden_hyp_vecs_start)
ENTRY(__bp_harden_hyp_vecs_end)
.macro smccc_workaround_1 inst
ENTRY(__smccc_workaround_1_smc_start)
sub sp, sp, #(8 * 4)
stp x2, x3, [sp, #(8 * 0)]
stp x0, x1, [sp, #(8 * 2)]
mov w0, #ARM_SMCCC_ARCH_WORKAROUND_1
\inst #0
smc #0
ldp x2, x3, [sp, #(8 * 0)]
ldp x0, x1, [sp, #(8 * 2)]
add sp, sp, #(8 * 4)
.endm
ENTRY(__smccc_workaround_1_smc_start)
smccc_workaround_1 smc
ENTRY(__smccc_workaround_1_smc_end)
ENTRY(__smccc_workaround_1_hvc_start)
smccc_workaround_1 hvc
ENTRY(__smccc_workaround_1_hvc_end)
arch/arm64/kernel/cpu_errata.c
+3 -6
View File
@@ -85,8 +85,6 @@ DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
#ifdef CONFIG_KVM
extern char __smccc_workaround_1_smc_start[];
extern char __smccc_workaround_1_smc_end[];
extern char __smccc_workaround_1_hvc_start[];
extern char __smccc_workaround_1_hvc_end[];
static void __copy_hyp_vect_bpi(int slot, const char *hyp_vecs_start,
const char *hyp_vecs_end)
@@ -131,8 +129,6 @@ static void __install_bp_hardening_cb(bp_hardening_cb_t fn,
#else
#define __smccc_workaround_1_smc_start NULL
#define __smccc_workaround_1_smc_end NULL
#define __smccc_workaround_1_hvc_start NULL
#define __smccc_workaround_1_hvc_end NULL
static void __install_bp_hardening_cb(bp_hardening_cb_t fn,
const char *hyp_vecs_start,
@@ -206,8 +202,9 @@ enable_smccc_arch_workaround_1(const struct arm64_cpu_capabilities *entry)
if ((int)res.a0 < 0)
return;
cb = call_hvc_arch_workaround_1;
smccc_start = __smccc_workaround_1_hvc_start;
smccc_end = __smccc_workaround_1_hvc_end;
/* This is a guest, no need to patch KVM vectors */
smccc_start = NULL;
smccc_end = NULL;
break;
case PSCI_CONDUIT_SMC: