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Message-Id: <20221110015327.3389351-2-oliver.upton@linux.dev>
Date: Thu, 10 Nov 2022 01:53:25 +0000
From: Oliver Upton <oliver.upton@...ux.dev>
To: Marc Zyngier <maz@...nel.org>, James Morse <james.morse@....com>,
Alexandru Elisei <alexandru.elisei@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Oliver Upton <oliver.upton@...ux.dev>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>
Cc: Raghavendra Rao Ananta <rananta@...gle.com>,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 1/3] KVM: arm64: Use a generalized accessor for SMCCC args
Avoid the need to introduce yet another accessor for every argument
position with a generalized one instead. Align with the SMCCC
specification and count arguments starting from 1.
No functional change intended.
Signed-off-by: Oliver Upton <oliver.upton@...ux.dev>
---
arch/arm64/include/asm/kvm_hypercalls.h | 22 ++++++++--------------
arch/arm64/kvm/hypercalls.c | 4 ++--
arch/arm64/kvm/psci.c | 14 +++++++-------
arch/arm64/kvm/pvtime.c | 2 +-
arch/arm64/kvm/trng.c | 4 ++--
5 files changed, 20 insertions(+), 26 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_hypercalls.h b/arch/arm64/include/asm/kvm_hypercalls.h
index dfebe8dd8dcd..c30d6ae76000 100644
--- a/arch/arm64/include/asm/kvm_hypercalls.h
+++ b/arch/arm64/include/asm/kvm_hypercalls.h
@@ -13,20 +13,14 @@ 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)
-{
- return vcpu_get_reg(vcpu, 1);
-}
-
-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)
-{
- return vcpu_get_reg(vcpu, 3);
-}
+#define smccc_get_arg(vcpu, arg) \
+({ \
+ u64 __val; \
+ \
+ BUILD_BUG_ON(arg < 1 || arg > 17); \
+ __val = vcpu_get_reg(vcpu, arg); \
+ __val; \
+})
static inline void smccc_set_retval(struct kvm_vcpu *vcpu,
unsigned long a0,
diff --git a/arch/arm64/kvm/hypercalls.c b/arch/arm64/kvm/hypercalls.c
index 6804075ce57f..62ce45d0d957 100644
--- a/arch/arm64/kvm/hypercalls.c
+++ b/arch/arm64/kvm/hypercalls.c
@@ -40,7 +40,7 @@ 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);
@@ -136,7 +136,7 @@ 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 809710808b25..15a380858ccb 100644
--- a/arch/arm64/kvm/psci.c
+++ b/arch/arm64/kvm/psci.c
@@ -63,7 +63,7 @@ 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;
@@ -84,7 +84,7 @@ 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);
@@ -93,7 +93,7 @@ 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);
@@ -120,8 +120,8 @@ 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;
@@ -317,7 +317,7 @@ 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;
@@ -371,7 +371,7 @@ 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 614b2e70b815..587eadf77f29 100644
--- a/arch/arm64/kvm/pvtime.c
+++ b/arch/arm64/kvm/pvtime.c
@@ -33,7 +33,7 @@ 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 b257d4eace50..953cb0d1b6ff 100644
--- a/arch/arm64/kvm/trng.c
+++ b/arch/arm64/kvm/trng.c
@@ -23,7 +23,7 @@ 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) {
@@ -59,7 +59,7 @@ 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:
--
2.38.1.431.g37b22c650d-goog
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