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From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Cc: Quentin Perret <qperret@google.com>,
	kernel-team@android.com,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	James Morse <james.morse@arm.com>,
	Andrew Scull <ascull@google.com>, Will Deacon <will@kernel.org>,
	Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: [PATCH 7/8] KVM: arm64: Simplify __kvm_enable_ssbs()
Date: Mon, 26 Oct 2020 09:51:15 +0000	[thread overview]
Message-ID: <20201026095116.72051-8-maz@kernel.org> (raw)
In-Reply-To: <20201026095116.72051-1-maz@kernel.org>

Move the setting of SSBS directly into the HVC handler, using
the C helpers rather than the inline asssembly code.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 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 d52c1b3ce589..c9423f36e05c 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 2af8a5e902af..5125e934da22 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


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  parent reply	other threads:[~2020-10-26  9:53 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-26  9:51 [PATCH 0/8] KVM: arm64: Host EL2 entry improvements Marc Zyngier
2020-10-26  9:51 ` [PATCH 1/8] KVM: arm64: Don't corrupt tpidr_el2 on failed HVC call Marc Zyngier
2020-10-26 14:36   ` Quentin Perret
2020-10-26  9:51 ` [PATCH 2/8] KVM: arm64: Remove leftover kern_hyp_va() in nVHE TLB invalidation Marc Zyngier
2020-11-02 13:30   ` Alexandru Elisei
2020-10-26  9:51 ` [PATCH 3/8] KVM: arm64: Drop useless PAN setting on host EL1 to EL2 transition Marc Zyngier
2020-10-26 10:48   ` Vladimir Murzin
2020-10-26  9:51 ` [PATCH 4/8] KVM: arm64: Add kimg_hyp_va() helper Marc Zyngier
2020-10-26  9:51 ` [PATCH 5/8] KVM: arm64: Turn host HVC handling into a dispatch table Marc Zyngier
2020-11-02 14:19   ` Alexandru Elisei
2020-10-26  9:51 ` [PATCH 6/8] KVM: arm64: Patch kimage_voffset instead of loading the EL1 value Marc Zyngier
2020-10-26  9:51 ` Marc Zyngier [this message]
2020-11-02 15:30   ` [PATCH 7/8] KVM: arm64: Simplify __kvm_enable_ssbs() Alexandru Elisei
2020-10-26  9:51 ` [PATCH 8/8] KVM: arm64: Avoid repetitive stack access on host EL1 to EL2 exception Marc Zyngier
2020-11-02 16:28   ` Alexandru Elisei

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