[PATCH 09/16] KVM: arm64: timers: Allow save/restoring of the physical timer

From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.linux.dev, kvm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Cc: James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Oliver Upton <oliver.upton@linux.dev>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Ricardo Koller <ricarkol@google.com>,
	Simon Veith <sveith@amazon.de>,
	dwmw2@infradead.org
Subject: [PATCH 09/16] KVM: arm64: timers: Allow save/restoring of the physical timer
Date: Thu, 16 Feb 2023 14:21:16 +0000	[thread overview]
Message-ID: <20230216142123.2638675-10-maz@kernel.org> (raw)
In-Reply-To: <20230216142123.2638675-1-maz@kernel.org>

Nothing like being 10 year late to a party!

Now that userspace can set counter offsets, we can save/restore
the physical timer as well!

Nobody really cared so far, but you're welcome anyway.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/guest.c | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 07444fa22888..46e910819de6 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -590,11 +590,16 @@ static unsigned long num_core_regs(const struct kvm_vcpu *vcpu)
 	return copy_core_reg_indices(vcpu, NULL);
 }
 
-/**
- * ARM64 versions of the TIMER registers, always available on arm64
- */
+static const u64 timer_reg_list[] = {
+	KVM_REG_ARM_TIMER_CTL,
+	KVM_REG_ARM_TIMER_CNT,
+	KVM_REG_ARM_TIMER_CVAL,
+	KVM_REG_ARM_PTIMER_CTL,
+	KVM_REG_ARM_PTIMER_CNT,
+	KVM_REG_ARM_PTIMER_CVAL,
+};
 
-#define NUM_TIMER_REGS 3
+#define NUM_TIMER_REGS ARRAY_SIZE(timer_reg_list)
 
 static bool is_timer_reg(u64 index)
 {
@@ -602,6 +607,9 @@ static bool is_timer_reg(u64 index)
 	case KVM_REG_ARM_TIMER_CTL:
 	case KVM_REG_ARM_TIMER_CNT:
 	case KVM_REG_ARM_TIMER_CVAL:
+	case KVM_REG_ARM_PTIMER_CTL:
+	case KVM_REG_ARM_PTIMER_CNT:
+	case KVM_REG_ARM_PTIMER_CVAL:
 		return true;
 	}
 	return false;
@@ -609,14 +617,11 @@ static bool is_timer_reg(u64 index)
 
 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
 {
-	if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
-		return -EFAULT;
-	uindices++;
-	if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
-		return -EFAULT;
-	uindices++;
-	if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
-		return -EFAULT;
+	for (int i = 0; i < NUM_TIMER_REGS; i++) {
+		if (put_user(timer_reg_list[i], uindices))
+			return -EFAULT;
+		uindices++;
+	}
 
 	return 0;
 }
-- 
2.34.1

