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<878rriicez.wl-maz@kernel.org> From: Marc Zyngier To: Raghavendra Rao Ananta Cc: Andrew Jones , James Morse , Alexandru Elisei , Suzuki K Poulose , Paolo Bonzini , Catalin Marinas , Will Deacon , Peter Shier , Ricardo Koller , Oliver Upton , Reiji Watanabe , Jing Zhang , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: Re: [PATCH v7 0/9] KVM: arm64: Add support for hypercall services selection In-Reply-To: References: <20220502233853.1233742-1-rananta@google.com> <878rri8r78.wl-maz@kernel.org> 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/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: rananta@google.com, drjones@redhat.com, james.morse@arm.com, alexandru.elisei@arm.com, suzuki.poulose@arm.com, 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linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: Re: [PATCH v7 0/9] KVM: arm64: Add support for hypercall services selection In-Reply-To: References: <20220502233853.1233742-1-rananta@google.com> <878rri8r78.wl-maz@kernel.org> 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/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: rananta@google.com, drjones@redhat.com, james.morse@arm.com, alexandru.elisei@arm.com, suzuki.poulose@arm.com, pbonzini@redhat.com, catalin.marinas@arm.com, will@kernel.org, pshier@google.com, ricarkol@google.com, oupton@google.com, reijiw@google.com, jingzhangos@google.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, kvm@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Tue, 03 May 2022 19:49:13 +0100, Raghavendra Rao Ananta wrote: >=20 > Hi Marc, >=20 > On Tue, May 3, 2022 at 10:24 AM Marc Zyngier wrote: > > > > On Tue, 03 May 2022 00:38:44 +0100, > > Raghavendra Rao Ananta wrote: > > > > > > Hello, > > > > > > Continuing the discussion from [1], the series tries to add support > > > for the userspace to elect the hypercall services that it wishes > > > to expose to the guest, rather than the guest discovering them > > > unconditionally. The idea employed by the series was taken from > > > [1] as suggested by Marc Z. > > > > As it took some time to get there, and that there was still a bunch of > > things to address, I've taken the liberty to apply my own fixes to the > > series. > > > > Please have a look at [1], and let me know if you're OK with the > > result. If you are, I'll merge the series for 5.19. > > > > Thanks, > > > > M. > > > Thank you for speeding up the process; appreciate it. However, the > series's selftest patches have a dependency on Oliver's > PSCI_SYSTEM_SUSPEND's selftest patches [1][2]. Can we pull them in > too? Urgh... I guess this is the time to set some ground rules: - Please don't introduce dependencies between series, that's unmanageable. I really need to see each series independently, and if there is a merge conflict, that's my job to fix (and I don't really mind). - If there is a dependency between series, please post a version of the required patches as a prefix to your series, assuming this prefix is itself standalone. If it isn't, then something really is wrong, and the series should be resplit. - You also should be basing your series on an *official* tag from Linus' tree (preferably -rc1, -rc2 or -rc3), and not something random like any odd commit from the KVM tree (I had conflicts while applying this on -rc3, probably due to the non-advertised dependency on Oliver's series). >=20 > aarch64/hypercalls.c: In function =E2=80=98guest_test_hvc=E2=80=99: > aarch64/hypercalls.c:95:30: error: storage size of =E2=80=98res=E2=80=99 = isn=E2=80=99t known > 95 | struct arm_smccc_res res; > | ^~~ > aarch64/hypercalls.c:103:17: warning: implicit declaration of function > =E2=80=98smccc_hvc=E2=80=99 [-Wimplicit-function-declaration] > 103 | smccc_hvc(hc_info->func_id, hc_info->arg1, 0, > 0, 0, 0, 0, 0, &res); > | ^~~~~~~~~ > I've picked the two patches, which means they will most likely appear twice in the history. In the future, please reach out so that we can organise this better. > Also, just a couple of readability nits in the fixed version: >=20 > 1. Patch-2/9, hypercall.c:kvm_hvc_call_default_allowed(), in the > 'default' case, do you think we should probably add a small comment > that mentions we are checking for func_id in the PSCI range? Dumped a one-liner there. > 2. Patch-2/9, arm_hypercall.h, clear all the macros in this patch > itself instead of doing it in increments (unless there's some reason > that I'm missing)? Ah, rebasing leftovers, now gone. I've pushed an updated branch again, please have a look. M. --=20 Without deviation from the norm, progress is not possible.