linux-kernel - [PATCH V3] KVM: arm64: Implement vq

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Message-Id: <be823e68faffc82a6f621c16ce1bd45990d92791.1560160681.git.viresh.kumar@linaro.org>
Date:   Mon, 10 Jun 2019 15:30:03 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Marc Zyngier <marc.zyngier@....com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry@....com>,
        Suzuki K Pouloze <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Dave Martin <Dave.Martin@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org
Subject: [PATCH V3] KVM: arm64: Implement vq_present() as a macro

This routine is a one-liner and doesn't really need to be function and
can be implemented as a macro.

Suggested-by: Dave Martin <Dave.Martin@....com>
Reviewed-by: Dave Martin <Dave.Martin@....com>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
V2->V3:
- Pass "vqs" instead of "&vqs" to vq_present().
- Added Reviewed-by from Dave.

V1->V2:
- The previous implementation was fixing a compilation error that
  occurred only with old compilers (from 2015) due to a bug in the
  compiler itself.

- Dave suggested to rather implement this as a macro which made more
  sense.

 arch/arm64/kvm/guest.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 3ae2f82fca46..ae734fcfd4ea 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -207,13 +207,7 @@ static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 
 #define vq_word(vq) (((vq) - SVE_VQ_MIN) / 64)
 #define vq_mask(vq) ((u64)1 << ((vq) - SVE_VQ_MIN) % 64)
-
-static bool vq_present(
-	const u64 (*const vqs)[KVM_ARM64_SVE_VLS_WORDS],
-	unsigned int vq)
-{
-	return (*vqs)[vq_word(vq)] & vq_mask(vq);
-}
+#define vq_present(vqs, vq) ((vqs)[vq_word(vq)] & vq_mask(vq))
 
 static int get_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 {
@@ -258,7 +252,7 @@ static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 
 	max_vq = 0;
 	for (vq = SVE_VQ_MIN; vq <= SVE_VQ_MAX; ++vq)
-		if (vq_present(&vqs, vq))
+		if (vq_present(vqs, vq))
 			max_vq = vq;
 
 	if (max_vq > sve_vq_from_vl(kvm_sve_max_vl))
@@ -272,7 +266,7 @@ static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 	 * maximum:
 	 */
 	for (vq = SVE_VQ_MIN; vq <= max_vq; ++vq)
-		if (vq_present(&vqs, vq) != sve_vq_available(vq))
+		if (vq_present(vqs, vq) != sve_vq_available(vq))
 			return -EINVAL;
 
 	/* Can't run with no vector lengths at all: */
-- 
2.21.0.rc0.269.g1a574e7a288b