From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4DFB6261E4 for ; Fri, 26 May 2023 14:33:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E88DDC433A0; Fri, 26 May 2023 14:33:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1685111634; bh=Xl35f5y+0lJ6cnk0BItkJo8xNvJzARnksbTzaqW58BI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=r+kfFMiHYsGjwJcfHCFkTO0wJg6ZQPhYa+JZGFxnzoZMzMFdWyI6yZKMuhfR+6NN8 ORgog4mBwfeUYwoV251/69MsgRgmZTmkzoD6dPIONsCpa3UN8hS3uAVnfZBxAkRebu 8VvyT8maCPStot229vCbIZf8rDXbCvFZEYV87dVAjmwEStlvyrFirdj4jGMDMt1eI8 yBzZZshEwW+1Sn3eF8AERXyoyKthwcab+IqNi5Qme02v66BM9iDEzEXMFyJJ6NeNh+ TOMzPvfDOm9bje2fuKPTTD58V6d5EMN/gl58QU7ayErPKQZRE++EsKXKsdI8SPOkeV G0kw1PPx9QlgQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1q2YVr-000aHS-Sc; Fri, 26 May 2023 15:33:51 +0100 From: Marc Zyngier To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Quentin Perret , Will Deacon , Fuad Tabba Subject: [PATCH v2 02/17] arm64: Prevent the use of is_kernel_in_hyp_mode() in hypervisor code Date: Fri, 26 May 2023 15:33:33 +0100 Message-Id: <20230526143348.4072074-3-maz@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230526143348.4072074-1-maz@kernel.org> References: <20230526143348.4072074-1-maz@kernel.org> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, james.morse@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com, qperret@google.com, will@kernel.org, tabba@google.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Using is_kernel_in_hyp_mode() in hypervisor code is a pretty bad mistake. This helper only checks for CurrentEL being EL2, which is always true. Make the link fail if using the helper in hypervisor context by referencing a non-existent function. Whilst we're at it, flag the helper as __always_inline, which it really should be. Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/virt.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h index 4eb601e7de50..91029709d133 100644 --- a/arch/arm64/include/asm/virt.h +++ b/arch/arm64/include/asm/virt.h @@ -110,8 +110,13 @@ static inline bool is_hyp_mode_mismatched(void) return __boot_cpu_mode[0] != __boot_cpu_mode[1]; } -static inline bool is_kernel_in_hyp_mode(void) +extern void gotcha_is_kernel_in_hyp_mode(void); + +static __always_inline bool is_kernel_in_hyp_mode(void) { +#if defined(__KVM_NVHE_HYPERVISOR__) || defined(__KVM_VHE_HYPERVISOR__) + gotcha_is_kernel_in_hyp_mode(); +#endif return read_sysreg(CurrentEL) == CurrentEL_EL2; } -- 2.34.1