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Sat, 18 Apr 2026 09:24:05 +0000 Date: Sat, 18 Apr 2026 10:24:04 +0100 Message-ID: <87se8sbozv.wl-maz@kernel.org> From: Marc Zyngier To: Yeoreum Yun Cc: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, zohar@linux.ibm.com, roberto.sassu@huawei.com, dmitry.kasatkin@gmail.com, eric.snowberg@oracle.com, peterhuewe@gmx.de, jarkko@kernel.org, jgg@ziepe.ca, sudeep.holla@kernel.org, oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org Subject: Re: [RFC PATCH 4/4] firmware: arm_ffa: check pkvm initailised when initailise ffa driver In-Reply-To: <20260417175759.3191279-5-yeoreum.yun@arm.com> References: <20260417175759.3191279-1-yeoreum.yun@arm.com> <20260417175759.3191279-5-yeoreum.yun@arm.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: yeoreum.yun@arm.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, zohar@linux.ibm.com, roberto.sassu@huawei.com, dmitry.kasatkin@gmail.com, eric.snowberg@oracle.com, peterhuewe@gmx.de, jarkko@kernel.org, jgg@ziepe.ca, sudeep.holla@kernel.org, oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Fri, 17 Apr 2026 18:57:59 +0100, Yeoreum Yun wrote: > > When pKVM is enabled, the FF-A driver must be initialized after pKVM. > Otherwise, pKVM cannot negotiate the FF-A version or > obtain RX/TX buffer information, leading to failures in FF-A calls. > > During FF-A driver initialization, check whether pKVM has been initialized. > If not, defer probing of the FF-A driver. > > Signed-off-by: Yeoreum Yun > --- > arch/arm64/kvm/arm.c | 1 + > drivers/firmware/arm_ffa/driver.c | 12 ++++++++++++ > 2 files changed, 13 insertions(+) > > diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c > index 410ffd41fd73..0f517b1c05cd 100644 > --- a/arch/arm64/kvm/arm.c > +++ b/arch/arm64/kvm/arm.c > @@ -119,6 +119,7 @@ bool is_kvm_arm_initialised(void) > { > return kvm_arm_initialised; > } > +EXPORT_SYMBOL(is_kvm_arm_initialised); EXPORT_SYMBOL_GPL(), please. > > int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) > { > diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c > index 02c76ac1570b..2647d6554afd 100644 > --- a/drivers/firmware/arm_ffa/driver.c > +++ b/drivers/firmware/arm_ffa/driver.c > @@ -42,6 +42,8 @@ > #include > #include > > +#include > + > #include "common.h" > > #define FFA_DRIVER_VERSION FFA_VERSION_1_2 > @@ -2035,6 +2037,16 @@ static int __init ffa_init(void) > u32 buf_sz; > size_t rxtx_bufsz = SZ_4K; > > + /* > + * When pKVM is enabled, the FF-A driver must be initialized > + * after pKVM initialization. Otherwise, pKVM cannot negotiate > + * the FF-A version or obtain RX/TX buffer information, > + * which leads to failures in FF-A calls. > + */ > + if (IS_ENABLED(CONFIG_KVM) && is_protected_kvm_enabled() && > + !is_kvm_arm_initialised()) > + return -EPROBE_DEFER; > + That's still fundamentally wrong: pkvm is not ready until finalize_pkvm() has finished, and that's not indicated by is_kvm_arm_initialised(). M. -- Jazz isn't dead. It just smells funny.