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selftests: KVM: Align SMCCC call with the spec in steal_time

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[ Upstream commit 01f91acb55be7aac3950b89c458bcea9ef6e4f49 ]

The SMC64 calling convention passes a function identifier in w0 and its
parameters in x1-x17. Given this, there are two deviations in the
SMC64 call performed by the steal_time test: the function identifier is
assigned to a 64 bit register and the parameter is only 32 bits wide.

Align the call with the SMCCC by using a 32 bit register to handle the
function identifier and increasing the parameter width to 64 bits.

Suggested-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Message-Id: <20210921171121.2148982-3-oupton@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Oliver Upton 2021-09-21 17:11:21 +00:00 committed by Greg Kroah-Hartman
parent 352b02562a
commit b8add3f47a
1 changed files with 2 additions and 2 deletions
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4
tools/testing/selftests/kvm/steal_time.c
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@ -120,12 +120,12 @@ struct st_time {
uint64_t st_time;
};
static int64_t smccc(uint32_t func, uint32_t arg)
static int64_t smccc(uint32_t func, uint64_t arg)
{
unsigned long ret;
asm volatile(
"mov x0, %1\n"
"mov w0, %w1\n"
"mov x1, %2\n"
"hvc #0\n"
"mov %0, x0\n"