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Date: Fri, 27 May 2022 16:02:32 +0800
From: Gavin Shan <gshan@...hat.com>
To: kvmarm@...ts.cs.columbia.edu
Cc: maz@...nel.org, linux-kernel@...r.kernel.org, eauger@...hat.com,
oupton@...gle.com, Jonathan.Cameron@...wei.com,
pbonzini@...hat.com, vkuznets@...hat.com, will@...nel.org,
james.morse@....com, mark.rutland@....com,
shannon.zhaosl@...il.com, shijie@...eremail.onmicrosoft.com,
shan.gavin@...il.com
Subject: [PATCH v7 01/22] KVM: arm64: Extend smccc_get_argx()
Currently, there are 3 inline functions to retrieve SMCCC arguments,
but the number of arguments is limited to 3. We need to retrieve
more SMCCC arguments when SDEI virtualization is supported.
This introduces smccc_get_arg(), which accepts @index to indicate
the SMCCC argument to be retrieved. Besides, smccc_get_function()
also calls into this newly introduced helper. Further more, we also
mechanically replace smccc_get_{arg1, arg2, arg3}() using the newly
introduced helper.
Signed-off-by: Gavin Shan <gshan@...hat.com>
---
arch/arm64/kvm/hypercalls.c | 4 ++--
arch/arm64/kvm/psci.c | 14 +++++++-------
arch/arm64/kvm/pvtime.c | 2 +-
arch/arm64/kvm/trng.c | 4 ++--
include/kvm/arm_hypercalls.h | 19 +++++--------------
5 files changed, 17 insertions(+), 26 deletions(-)
diff --git a/arch/arm64/kvm/hypercalls.c b/arch/arm64/kvm/hypercalls.c
index c9f401fa01a9..69f437f0d7c7 100644
--- a/arch/arm64/kvm/hypercalls.c
+++ b/arch/arm64/kvm/hypercalls.c
@@ -41,7 +41,7 @@ static void kvm_ptp_get_time(struct kvm_vcpu *vcpu, u64 *val)
* (virtual or physical) with the first argument of the SMCCC
* call. In case the identifier is not supported, error out.
*/
- feature = smccc_get_arg1(vcpu);
+ feature = smccc_get_arg(vcpu, 1);
switch (feature) {
case KVM_PTP_VIRT_COUNTER:
cycles = systime_snapshot.cycles - vcpu_read_sys_reg(vcpu, CNTVOFF_EL2);
@@ -137,7 +137,7 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
val[0] = ARM_SMCCC_VERSION_1_1;
break;
case ARM_SMCCC_ARCH_FEATURES_FUNC_ID:
- feature = smccc_get_arg1(vcpu);
+ feature = smccc_get_arg(vcpu, 1);
switch (feature) {
case ARM_SMCCC_ARCH_WORKAROUND_1:
switch (arm64_get_spectre_v2_state()) {
diff --git a/arch/arm64/kvm/psci.c b/arch/arm64/kvm/psci.c
index 7fbc4c1b9df0..5394b8a69e10 100644
--- a/arch/arm64/kvm/psci.c
+++ b/arch/arm64/kvm/psci.c
@@ -64,7 +64,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
struct kvm_vcpu *vcpu = NULL;
unsigned long cpu_id;
- cpu_id = smccc_get_arg1(source_vcpu);
+ cpu_id = smccc_get_arg(source_vcpu, 1);
if (!kvm_psci_valid_affinity(source_vcpu, cpu_id))
return PSCI_RET_INVALID_PARAMS;
@@ -85,7 +85,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
reset_state = &vcpu->arch.reset_state;
- reset_state->pc = smccc_get_arg2(source_vcpu);
+ reset_state->pc = smccc_get_arg(source_vcpu, 2);
/* Propagate caller endianness */
reset_state->be = kvm_vcpu_is_be(source_vcpu);
@@ -94,7 +94,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
* NOTE: We always update r0 (or x0) because for PSCI v0.1
* the general purpose registers are undefined upon CPU_ON.
*/
- reset_state->r0 = smccc_get_arg3(source_vcpu);
+ reset_state->r0 = smccc_get_arg(source_vcpu, 3);
WRITE_ONCE(reset_state->reset, true);
kvm_make_request(KVM_REQ_VCPU_RESET, vcpu);
@@ -121,8 +121,8 @@ static unsigned long kvm_psci_vcpu_affinity_info(struct kvm_vcpu *vcpu)
struct kvm *kvm = vcpu->kvm;
struct kvm_vcpu *tmp;
- target_affinity = smccc_get_arg1(vcpu);
- lowest_affinity_level = smccc_get_arg2(vcpu);
+ target_affinity = smccc_get_arg(vcpu, 1);
+ lowest_affinity_level = smccc_get_arg(vcpu, 2);
if (!kvm_psci_valid_affinity(vcpu, target_affinity))
return PSCI_RET_INVALID_PARAMS;
@@ -318,7 +318,7 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor)
val = minor == 0 ? KVM_ARM_PSCI_1_0 : KVM_ARM_PSCI_1_1;
break;
case PSCI_1_0_FN_PSCI_FEATURES:
- arg = smccc_get_arg1(vcpu);
+ arg = smccc_get_arg(vcpu, 1);
val = kvm_psci_check_allowed_function(vcpu, arg);
if (val)
break;
@@ -372,7 +372,7 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor)
fallthrough;
case PSCI_1_1_FN64_SYSTEM_RESET2:
if (minor >= 1) {
- arg = smccc_get_arg1(vcpu);
+ arg = smccc_get_arg(vcpu, 1);
if (arg <= PSCI_1_1_RESET_TYPE_SYSTEM_WARM_RESET ||
arg >= PSCI_1_1_RESET_TYPE_VENDOR_START) {
diff --git a/arch/arm64/kvm/pvtime.c b/arch/arm64/kvm/pvtime.c
index 78a09f7a6637..05e775fc9e8b 100644
--- a/arch/arm64/kvm/pvtime.c
+++ b/arch/arm64/kvm/pvtime.c
@@ -34,7 +34,7 @@ void kvm_update_stolen_time(struct kvm_vcpu *vcpu)
long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu)
{
- u32 feature = smccc_get_arg1(vcpu);
+ u32 feature = smccc_get_arg(vcpu, 1);
long val = SMCCC_RET_NOT_SUPPORTED;
switch (feature) {
diff --git a/arch/arm64/kvm/trng.c b/arch/arm64/kvm/trng.c
index 99bdd7103c9c..89911b724a26 100644
--- a/arch/arm64/kvm/trng.c
+++ b/arch/arm64/kvm/trng.c
@@ -24,7 +24,7 @@ static const uuid_t arm_smc_trng_uuid __aligned(4) = UUID_INIT(
static int kvm_trng_do_rnd(struct kvm_vcpu *vcpu, int size)
{
DECLARE_BITMAP(bits, TRNG_MAX_BITS64);
- u32 num_bits = smccc_get_arg1(vcpu);
+ u32 num_bits = smccc_get_arg(vcpu, 1);
int i;
if (num_bits > 3 * size) {
@@ -60,7 +60,7 @@ int kvm_trng_call(struct kvm_vcpu *vcpu)
val = ARM_SMCCC_TRNG_VERSION_1_0;
break;
case ARM_SMCCC_TRNG_FEATURES:
- switch (smccc_get_arg1(vcpu)) {
+ switch (smccc_get_arg(vcpu, 1)) {
case ARM_SMCCC_TRNG_VERSION:
case ARM_SMCCC_TRNG_FEATURES:
case ARM_SMCCC_TRNG_GET_UUID:
diff --git a/include/kvm/arm_hypercalls.h b/include/kvm/arm_hypercalls.h
index 1188f116cf4e..ffd06387dfdf 100644
--- a/include/kvm/arm_hypercalls.h
+++ b/include/kvm/arm_hypercalls.h
@@ -8,24 +8,15 @@
int kvm_hvc_call_handler(struct kvm_vcpu *vcpu);
-static inline u32 smccc_get_function(struct kvm_vcpu *vcpu)
-{
- return vcpu_get_reg(vcpu, 0);
-}
-
-static inline unsigned long smccc_get_arg1(struct kvm_vcpu *vcpu)
+static inline unsigned long smccc_get_arg(struct kvm_vcpu *vcpu,
+ unsigned char index)
{
- return vcpu_get_reg(vcpu, 1);
+ return vcpu_get_reg(vcpu, index);
}
-static inline unsigned long smccc_get_arg2(struct kvm_vcpu *vcpu)
-{
- return vcpu_get_reg(vcpu, 2);
-}
-
-static inline unsigned long smccc_get_arg3(struct kvm_vcpu *vcpu)
+static inline u32 smccc_get_function(struct kvm_vcpu *vcpu)
{
- return vcpu_get_reg(vcpu, 3);
+ return smccc_get_arg(vcpu, 0);
}
static inline void smccc_set_retval(struct kvm_vcpu *vcpu,
--
2.23.0
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