RE: [PATCH 47/56] KVM: arm64: timers: Move timer registers to the sys_regs file

Hi Marc,

-----Original Message-----
From: kvmarm-bounces@lists.cs.columbia.edu <redacted> On Behalf Of Marc Zyngier
Sent: Thursday, August 6, 2020 1:57 AM
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peng Hao <redacted>; kernel-team@android.com; kvm@vger.kernel.org; Will Deacon <will@kernel.org>; Catalin Marinas <Catalin.Marinas@arm.com>; Alexander Graf <graf@amazon.com>; kvmarm@lists.cs.columbia.edu; linux-arm-kernel@lists.infradead.org
Subject: [PATCH 47/56] KVM: arm64: timers: Move timer registers to the sys_regs file

Move the timer gsisters to the sysreg file. This will further help when they are directly changed by a nesting hypervisor in the VNCR page.

This requires moving the initialisation of the timer struct so that some of the helpers (such as arch_timer_ctx_index) can work correctly at an early stage.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/kvm_host.h |   6 ++
 arch/arm64/kvm/arch_timer.c       | 155 +++++++++++++++++++++++-------
 arch/arm64/kvm/trace_arm.h        |   8 +-
 include/kvm/arm_arch_timer.h      |  11 +--
 4 files changed, 136 insertions(+), 44 deletions(-)

+static u64 timer_get_offset(struct arch_timer_context *ctxt) {
+	struct kvm_vcpu *vcpu = ctxt->vcpu;
+
+	switch(arch_timer_ctx_index(ctxt)) {
+	case TIMER_VTIMER:
+		return __vcpu_sys_reg(vcpu, CNTVOFF_EL2);
+	default:
+		return 0;
+	}
+}
+
Can I export this helper? As in my ptp_kvm implementation I need get VCNT offset value separately not just give me a result of VCNT.

Thanks
Jianyong 


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