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Message-Id: <20180126142847.31240-10-marc.zyngier@arm.com>
Date: Fri, 26 Jan 2018 14:28:42 +0000
From: Marc Zyngier <marc.zyngier@....com>
To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
kvmarm@...ts.cs.columbia.edu
Cc: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Peter Maydell <peter.maydell@...aro.org>,
Christoffer Dall <christoffer.dall@...aro.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Mark Rutland <mark.rutland@....com>,
Jon Masters <jcm@...hat.com>
Subject: [PATCH 09/14] arm/arm64: KVM: Turn kvm_psci_version into a static inline
We're about to need kvm_psci_version in HYP too. So let's turn it
into a static inline, and pass the kvm structure as a second
parameter (so that HYP can do a kern_hyp_va on it).
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
arch/arm64/kvm/hyp/switch.c | 20 ++++++++++++--------
include/kvm/arm_psci.h | 27 ++++++++++++++++++++++++++-
virt/kvm/arm/psci.c | 23 ++---------------------
3 files changed, 40 insertions(+), 30 deletions(-)
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index 036e1f3d77a6..408c04d789a5 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -19,6 +19,8 @@
#include <linux/jump_label.h>
#include <uapi/linux/psci.h>
+#include <kvm/arm_psci.h>
+
#include <asm/kvm_asm.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_hyp.h>
@@ -350,14 +352,16 @@ int __hyp_text __kvm_vcpu_run(struct kvm_vcpu *vcpu)
if (exit_code == ARM_EXCEPTION_TRAP &&
(kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_HVC64 ||
- kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_HVC32) &&
- vcpu_get_reg(vcpu, 0) == PSCI_0_2_FN_PSCI_VERSION) {
- u64 val = PSCI_RET_NOT_SUPPORTED;
- if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features))
- val = 2;
-
- vcpu_set_reg(vcpu, 0, val);
- goto again;
+ kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_HVC32)) {
+ u32 val = vcpu_get_reg(vcpu, 0);
+
+ if (val == PSCI_0_2_FN_PSCI_VERSION) {
+ val = kvm_psci_version(vcpu, kern_hyp_va(vcpu->kvm));
+ if (unlikely(val == KVM_ARM_PSCI_0_1))
+ val = PSCI_RET_NOT_SUPPORTED;
+ vcpu_set_reg(vcpu, 0, val);
+ goto again;
+ }
}
if (static_branch_unlikely(&vgic_v2_cpuif_trap) &&
diff --git a/include/kvm/arm_psci.h b/include/kvm/arm_psci.h
index 4876bfac2195..32978b578002 100644
--- a/include/kvm/arm_psci.h
+++ b/include/kvm/arm_psci.h
@@ -18,6 +18,8 @@
#ifndef __KVM_ARM_PSCI_H__
#define __KVM_ARM_PSCI_H__
+#include <linux/kvm_host.h>
+
#define PSCI_VERSION(x,y) ((((x) & 0x7fff) << 16) | ((y) & 0xffff))
#define KVM_ARM_PSCI_0_1 PSCI_VERSION(0, 1)
#define KVM_ARM_PSCI_0_2 PSCI_VERSION(0, 2)
@@ -25,7 +27,30 @@
#define KVM_ARM_PSCI_LATEST KVM_ARM_PSCI_1_0
-int kvm_psci_version(struct kvm_vcpu *vcpu);
+/*
+ * We need the KVM pointer independently from the vcpu as we can call
+ * this from HYP, and need to apply kern_hyp_va on it...
+ */
+static inline int kvm_psci_version(struct kvm_vcpu *vcpu, struct kvm *kvm)
+{
+ /*
+ * Our PSCI implementation stays the same across versions from
+ * v0.2 onward, only adding the few mandatory functions (such
+ * as FEATURES with 1.0) that are required by newer
+ * revisions. It is thus safe to return the latest, unless
+ * userspace has instructed us otherwise.
+ */
+ if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features)) {
+ if (kvm->arch.psci_version)
+ return kvm->arch.psci_version;
+
+ return KVM_ARM_PSCI_LATEST;
+ }
+
+ return KVM_ARM_PSCI_0_1;
+}
+
+
int kvm_hvc_call_handler(struct kvm_vcpu *vcpu);
struct kvm_one_reg;
diff --git a/virt/kvm/arm/psci.c b/virt/kvm/arm/psci.c
index 3bb336ac7d7d..a021b62ed762 100644
--- a/virt/kvm/arm/psci.c
+++ b/virt/kvm/arm/psci.c
@@ -126,7 +126,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
if (!vcpu)
return PSCI_RET_INVALID_PARAMS;
if (!vcpu->arch.power_off) {
- if (kvm_psci_version(source_vcpu) != KVM_ARM_PSCI_0_1)
+ if (kvm_psci_version(source_vcpu, kvm) != KVM_ARM_PSCI_0_1)
return PSCI_RET_ALREADY_ON;
else
return PSCI_RET_INVALID_PARAMS;
@@ -235,25 +235,6 @@ static void kvm_psci_system_reset(struct kvm_vcpu *vcpu)
kvm_prepare_system_event(vcpu, KVM_SYSTEM_EVENT_RESET);
}
-int kvm_psci_version(struct kvm_vcpu *vcpu)
-{
- /*
- * Our PSCI implementation stays the same across versions from
- * v0.2 onward, only adding the few mandatory functions (such
- * as FEATURES with 1.0) that are required by newer
- * revisions. It is thus safe to return the latest, unless
- * userspace has instructed us otherwise.
- */
- if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features)) {
- if (vcpu->kvm->arch.psci_version)
- return vcpu->kvm->arch.psci_version;
-
- return KVM_ARM_PSCI_LATEST;
- }
-
- return KVM_ARM_PSCI_0_1;
-}
-
static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
@@ -411,7 +392,7 @@ static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
*/
static int kvm_psci_call(struct kvm_vcpu *vcpu)
{
- switch (kvm_psci_version(vcpu)) {
+ switch (kvm_psci_version(vcpu, vcpu->kvm)) {
case KVM_ARM_PSCI_1_0:
return kvm_psci_1_0_call(vcpu);
case KVM_ARM_PSCI_0_2:
--
2.14.2
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