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Mon, 08 Jun 2020 17:31:25 +0100 MIME-Version: 1.0 Date: Mon, 08 Jun 2020 17:31:24 +0100 From: Marc Zyngier To: Andrew Scull Subject: Re: [PATCH] KVM: arm64: Stop sparse from moaning at __hyp_this_cpu_ptr In-Reply-To: <20200608150035.GB96714@google.com> References: <20200608085731.1405854-1-maz@kernel.org> <20200608150035.GB96714@google.com> User-Agent: Roundcube Webmail/1.4.4 Message-ID: <61b7e8e75b2d60b21b20d9919fc8bafc@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: ascull@google.com, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200608_093126_901279_8FF706E8 X-CRM114-Status: GOOD ( 13.82 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, Suzuki K Poulose , James Morse , Julien Thierry , kernel-team@android.com, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2020-06-08 16:00, Andrew Scull wrote: > On Mon, Jun 08, 2020 at 09:57:31AM +0100, Marc Zyngier wrote: >> Sparse complains that __hyp_this_cpu_ptr() returns something >> that is flagged noderef and not in the correct address space >> (both being the result of the __percpu annotation). >> >> Pretend that __hyp_this_cpu_ptr() knows what it is doing by >> forcefully casting the pointer with __kernel __force. >> >> Signed-off-by: Marc Zyngier >> --- >> arch/arm64/include/asm/kvm_asm.h | 9 +++++++-- >> 1 file changed, 7 insertions(+), 2 deletions(-) >> >> diff --git a/arch/arm64/include/asm/kvm_asm.h >> b/arch/arm64/include/asm/kvm_asm.h >> index 0c9b5fc4ba0a..82691406d493 100644 >> --- a/arch/arm64/include/asm/kvm_asm.h >> +++ b/arch/arm64/include/asm/kvm_asm.h >> @@ -81,12 +81,17 @@ extern u32 __kvm_get_mdcr_el2(void); >> >> extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ]; >> >> -/* Home-grown __this_cpu_{ptr,read} variants that always work at HYP >> */ >> +/* >> + * Home-grown __this_cpu_{ptr,read} variants that always work at HYP, >> + * provided that sym is really a *symbol* and not a pointer obtained >> from > > Look at `this_cpu_ptr` one thing that stood out was `__verify_pcpu_ptr` > that is documented to be suitable for used in custom per CPU macros. I > didn't get how it worked (a type check?) but maybe it would work here > to validate the argment was indeed a per CPU symbol? It only works for sparse, but that is definitely a good addition while we're fixing the sparse compliance. Thanks, M. -- Jazz is not dead. It just smells funny... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel