Commit 01f91acb authored by Oliver Upton's avatar Oliver Upton Committed by Paolo Bonzini
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selftests: KVM: Align SMCCC call with the spec in steal_time 



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: default avatarAndrew Jones <drjones@redhat.com>
Signed-off-by: default avatarOliver Upton <oupton@google.com>
Reviewed-by: default avatarAndrew Jones <drjones@redhat.com>
Message-Id: <20210921171121.2148982-3-oupton@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 90b54129

tools/testing/selftests/kvm/steal_time.c

+2 −2
Original line number Diff line number Diff line
@@ -118,12 +118,12 @@ 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"