linux-kernel - [PATCH MANUALSEL 5.10 1/7] selftests: KVM: Align SMCCC call with the spec in steal

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Message-Id: <20211006111234.264020-1-sashal@kernel.org>
Date:   Wed,  6 Oct 2021 07:12:27 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Oliver Upton <oupton@...gle.com>,
        Andrew Jones <drjones@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sasha Levin <sashal@...nel.org>, shuah@...nel.org,
        kvm@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH MANUALSEL 5.10 1/7] selftests: KVM: Align SMCCC call with the spec in steal_time

From: Oliver Upton <oupton@...gle.com>

[ 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@...hat.com>
Signed-off-by: Oliver Upton <oupton@...gle.com>
Reviewed-by: Andrew Jones <drjones@...hat.com>
Message-Id: <20210921171121.2148982-3-oupton@...gle.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/kvm/steal_time.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kvm/steal_time.c b/tools/testing/selftests/kvm/steal_time.c
index fcc840088c91..7daedee3e7ee 100644
--- a/tools/testing/selftests/kvm/steal_time.c
+++ b/tools/testing/selftests/kvm/steal_time.c
@@ -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"
-- 
2.33.0