Move the setting of SSBS directly into the HVC handler, using
the C helpers rather than the inline asssembly code.
Reviewed-by: Alexandru Elisei <alexandru.elisei@xxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arch/arm64/include/asm/kvm_asm.h | 2 --
arch/arm64/include/asm/sysreg.h | 1 +
arch/arm64/kvm/hyp/nvhe/hyp-main.c | 6 +++++-
arch/arm64/kvm/hyp/nvhe/sysreg-sr.c | 11 -----------
4 files changed, 6 insertions(+), 14 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index 54387ccd1ab2..a542c422a036 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -189,8 +189,6 @@ extern void __kvm_timer_set_cntvoff(u64 cntvoff);
extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
-extern void __kvm_enable_ssbs(void);
-
extern u64 __vgic_v3_get_ich_vtr_el2(void);
extern u64 __vgic_v3_read_vmcr(void);
extern void __vgic_v3_write_vmcr(u32 vmcr);
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 174817ba119c..153faa15d490 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -461,6 +461,7 @@
#define SYS_PMCCFILTR_EL0 sys_reg(3, 3, 14, 15, 7)
+#define SYS_SCTLR_EL2 sys_reg(3, 4, 1, 0, 0)
#define SYS_ZCR_EL2 sys_reg(3, 4, 1, 2, 0)
#define SYS_DACR32_EL2 sys_reg(3, 4, 3, 0, 0)
#define SYS_SPSR_EL2 sys_reg(3, 4, 4, 0, 0)
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
index c0543b2e760e..82df7fc24760 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
@@ -58,7 +58,11 @@ static void handle___kvm_timer_set_cntvoff(struct kvm_cpu_context *host_ctxt)
static void handle___kvm_enable_ssbs(struct kvm_cpu_context *host_ctxt)
{
- __kvm_enable_ssbs();
+ u64 tmp;
+
+ tmp = read_sysreg_el2(SYS_SCTLR);
+ tmp |= SCTLR_ELx_DSSBS;
+ write_sysreg_el2(tmp, SYS_SCTLR);
}
static void handle___vgic_v3_get_ich_vtr_el2(struct kvm_cpu_context *host_ctxt)
diff --git a/arch/arm64/kvm/hyp/nvhe/sysreg-sr.c b/arch/arm64/kvm/hyp/nvhe/sysreg-sr.c
index 88a25fc8fcd3..29305022bc04 100644
--- a/arch/arm64/kvm/hyp/nvhe/sysreg-sr.c
+++ b/arch/arm64/kvm/hyp/nvhe/sysreg-sr.c
@@ -33,14 +33,3 @@ void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt)
__sysreg_restore_user_state(ctxt);
__sysreg_restore_el2_return_state(ctxt);
}
-
-void __kvm_enable_ssbs(void)
-{
- u64 tmp;
-
- asm volatile(
- "mrs %0, sctlr_el2\n"
- "orr %0, %0, %1\n"
- "msr sctlr_el2, %0"
- : "=&r" (tmp) : "L" (SCTLR_ELx_DSSBS));
-}
--
2.28.0
