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KVM: arm64: Simplify __kvm_enable_ssbs()

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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@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2020-10-21 21:52:54 +01:00
parent 68b824e428
commit 29052f1b92
4 changed files with 6 additions and 14 deletions
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2
arch/arm64/include/asm/kvm_asm.h
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@ -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);

1
arch/arm64/include/asm/sysreg.h
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@ -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)

6
arch/arm64/kvm/hyp/nvhe/hyp-main.c
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@ -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)

11
arch/arm64/kvm/hyp/nvhe/sysreg-sr.c
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@ -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));
}