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selftests: KVM: Create helper for making SMCCC calls

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The PSCI and PV stolen time tests both need to make SMCCC calls within
the guest. Create a helper for making SMCCC calls and rework the
existing tests to use the library function.

Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220504032446.4133305-10-oupton@google.com
This commit is contained in:
Oliver Upton 2022-05-04 03:24:43 +00:00 committed by Marc Zyngier
parent 6689fb8f21
commit 694e3dcc47
4 changed files with 58 additions and 27 deletions
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25
tools/testing/selftests/kvm/aarch64/psci_test.c
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@ -26,32 +26,23 @@
static uint64_t psci_cpu_on(uint64_t target_cpu, uint64_t entry_addr,
uint64_t context_id)
{
register uint64_t x0 asm("x0") = PSCI_0_2_FN64_CPU_ON;
register uint64_t x1 asm("x1") = target_cpu;
register uint64_t x2 asm("x2") = entry_addr;
register uint64_t x3 asm("x3") = context_id;
struct arm_smccc_res res;
asm("hvc #0"
: "=r"(x0)
: "r"(x0), "r"(x1), "r"(x2), "r"(x3)
: "memory");
smccc_hvc(PSCI_0_2_FN64_CPU_ON, target_cpu, entry_addr, context_id,
0, 0, 0, 0, &res);
return x0;
return res.a0;
}
static uint64_t psci_affinity_info(uint64_t target_affinity,
uint64_t lowest_affinity_level)
{
register uint64_t x0 asm("x0") = PSCI_0_2_FN64_AFFINITY_INFO;
register uint64_t x1 asm("x1") = target_affinity;
register uint64_t x2 asm("x2") = lowest_affinity_level;
struct arm_smccc_res res;
asm("hvc #0"
: "=r"(x0)
: "r"(x0), "r"(x1), "r"(x2)
: "memory");
smccc_hvc(PSCI_0_2_FN64_AFFINITY_INFO, target_affinity, lowest_affinity_level,
0, 0, 0, 0, 0, &res);
return x0;
return res.a0;
}
static void guest_main(uint64_t target_cpu)

22
tools/testing/selftests/kvm/include/aarch64/processor.h
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@ -185,4 +185,26 @@ static inline void local_irq_disable(void)
asm volatile("msr daifset, #3" : : : "memory");
}
/**
* struct arm_smccc_res - Result from SMC/HVC call
* @a0-a3 result values from registers 0 to 3
*/
struct arm_smccc_res {
unsigned long a0;
unsigned long a1;
unsigned long a2;
unsigned long a3;
};
/**
* smccc_hvc - Invoke a SMCCC function using the hvc conduit
* @function_id: the SMCCC function to be called
* @arg0-arg6: SMCCC function arguments, corresponding to registers x1-x7
* @res: pointer to write the return values from registers x0-x3
*
*/
void smccc_hvc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5,
uint64_t arg6, struct arm_smccc_res *res);
#endif /* SELFTEST_KVM_PROCESSOR_H */

25
tools/testing/selftests/kvm/lib/aarch64/processor.c
View File

@ -500,3 +500,28 @@ void __attribute__((constructor)) init_guest_modes(void)
{
guest_modes_append_default();
}
void smccc_hvc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5,
uint64_t arg6, struct arm_smccc_res *res)
{
asm volatile("mov w0, %w[function_id]\n"
"mov x1, %[arg0]\n"
"mov x2, %[arg1]\n"
"mov x3, %[arg2]\n"
"mov x4, %[arg3]\n"
"mov x5, %[arg4]\n"
"mov x6, %[arg5]\n"
"mov x7, %[arg6]\n"
"hvc #0\n"
"mov %[res0], x0\n"
"mov %[res1], x1\n"
"mov %[res2], x2\n"
"mov %[res3], x3\n"
: [res0] "=r"(res->a0), [res1] "=r"(res->a1),
[res2] "=r"(res->a2), [res3] "=r"(res->a3)
: [function_id] "r"(function_id), [arg0] "r"(arg0),
[arg1] "r"(arg1), [arg2] "r"(arg2), [arg3] "r"(arg3),
[arg4] "r"(arg4), [arg5] "r"(arg5), [arg6] "r"(arg6)
: "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7");
}

13
tools/testing/selftests/kvm/steal_time.c
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@ -118,17 +118,10 @@ struct st_time {
static int64_t smccc(uint32_t func, uint64_t arg)
{
unsigned long ret;
struct arm_smccc_res res;
asm volatile(
"mov w0, %w1\n"
"mov x1, %2\n"
"hvc #0\n"
"mov %0, x0\n"
: "=r" (ret) : "r" (func), "r" (arg) :
"x0", "x1", "x2", "x3");
return ret;
smccc_hvc(func, arg, 0, 0, 0, 0, 0, 0, &res);
return res.a0;
}
static void check_status(struct st_time *st)