linux-kernel - [PATCH 2/2] KVM: arm64: Depend on HAVE_KVM => OF instead of directly on OF

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Date:   Tue, 21 Sep 2021 15:22:31 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>
Cc:     James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH 2/2] KVM: arm64: Depend on HAVE_KVM => OF instead of directly
 on OF

Select HAVE_KVM if the KVM dependency is met (OF / Open Firmware), and
make KVM depend on HAVE_KVM instead of directly on OF.  This fixes the
oddity where arm64 configs can end up with KVM=y and HAVE_KVM=n, and will
hopefully prevent breakage if there are future users of HAVE_KVM.

Note, arm64 unconditionally selects OF, and has always done so (see
commit 8c2c3df31e3b ("arm64: Build infrastructure").  Keep the somewhat
pointless HAVE_KVM dependency on OF to document that KVM requires Open
Firmware support.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/arm64/Kconfig     | 1 +
 arch/arm64/kvm/Kconfig | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index b5b13a932561..38c0f36a5ed4 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -187,6 +187,7 @@ config ARM64
 	select HAVE_GCC_PLUGINS
 	select HAVE_HW_BREAKPOINT if PERF_EVENTS
 	select HAVE_IRQ_TIME_ACCOUNTING
+	select HAVE_KVM if OF
 	select HAVE_NMI
 	select HAVE_PATA_PLATFORM
 	select HAVE_PERF_EVENTS
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index c50f75cf76fe..e1e400bd8de5 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -20,7 +20,7 @@ if VIRTUALIZATION
 
 menuconfig KVM
 	bool "Kernel-based Virtual Machine (KVM) support"
-	depends on OF
+	depends on HAVE_KVM
 	select MMU_NOTIFIER
 	select PREEMPT_NOTIFIERS
 	select HAVE_KVM_CPU_RELAX_INTERCEPT
-- 
2.33.0.464.g1972c5931b-goog