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Tue, 01 Dec 2020 05:20:33 -0800 (PST) Date: Tue, 1 Dec 2020 13:20:32 +0000 From: David Brazdil To: Sudeep Holla Subject: Re: [PATCH v3 16/23] kvm: arm64: Forward safe PSCI SMCs coming from host Message-ID: <20201201132032.we4jbsvtsngwixse@google.com> References: <20201126155421.14901-1-dbrazdil@google.com> <20201126155421.14901-17-dbrazdil@google.com> <20201127165159.3s7hob5tgjcrbz33@bogus> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20201127165159.3s7hob5tgjcrbz33@bogus> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201201_082035_863925_F058540A X-CRM114-Status: GOOD ( 29.01 ) 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: Mark Rutland , Lorenzo Pieralisi , kernel-team@android.com, Jonathan Corbet , Catalin Marinas , Suzuki K Poulose , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, James Morse , linux-arm-kernel@lists.infradead.org, Marc Zyngier , Tejun Heo , Dennis Zhou , Christoph Lameter , Will Deacon , kvmarm@lists.cs.columbia.edu, Julien Thierry Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Nov 27, 2020 at 04:51:59PM +0000, Sudeep Holla wrote: > On Thu, Nov 26, 2020 at 03:54:14PM +0000, David Brazdil wrote: > > Forward the following PSCI SMCs issued by host to EL3 as they do not > > require the hypervisor's intervention. This assumes that EL3 correctly > > implements the PSCI specification. > > > > Only function IDs implemented in Linux are included. > > > > Where both 32-bit and 64-bit variants exist, it is assumed that the host > > will always use the 64-bit variant. > > > > * SMCs that only return information about the system > > * PSCI_VERSION - PSCI version implemented by EL3 > > * PSCI_FEATURES - optional features supported by EL3 > > * AFFINITY_INFO - power state of core/cluster > > * MIGRATE_INFO_TYPE - whether Trusted OS can be migrated > > * MIGRATE_INFO_UP_CPU - resident core of Trusted OS > > * operations which do not affect the hypervisor > > * MIGRATE - migrate Trusted OS to a different core > > * SET_SUSPEND_MODE - toggle OS-initiated mode > > * system shutdown/reset > > * SYSTEM_OFF > > * SYSTEM_RESET > > * SYSTEM_RESET2 > > > > Signed-off-by: David Brazdil > > --- > > arch/arm64/kvm/hyp/nvhe/psci-relay.c | 43 +++++++++++++++++++++++++++- > > 1 file changed, 42 insertions(+), 1 deletion(-) > > > > diff --git a/arch/arm64/kvm/hyp/nvhe/psci-relay.c b/arch/arm64/kvm/hyp/nvhe/psci-relay.c > > index e7091d89f0fc..7aa87ab7f5ce 100644 > > --- a/arch/arm64/kvm/hyp/nvhe/psci-relay.c > > +++ b/arch/arm64/kvm/hyp/nvhe/psci-relay.c > > @@ -57,14 +57,51 @@ static bool is_psci_call(u64 func_id) > > } > > } > > > > +static unsigned long psci_call(unsigned long fn, unsigned long arg0, > > + unsigned long arg1, unsigned long arg2) > > +{ > > + struct arm_smccc_res res; > > + > > + arm_smccc_1_1_smc(fn, arg0, arg1, arg2, &res); > > + return res.a0; > > +} > > + > > +static unsigned long psci_forward(struct kvm_cpu_context *host_ctxt) > > +{ > > + return psci_call(cpu_reg(host_ctxt, 0), cpu_reg(host_ctxt, 1), > > + cpu_reg(host_ctxt, 2), cpu_reg(host_ctxt, 3)); > > +} > > + > > +static __noreturn unsigned long psci_forward_noreturn(struct kvm_cpu_context *host_ctxt) > > +{ > > + psci_forward(host_ctxt); > > + hyp_panic(); /* unreachable */ > > +} > > + > > static unsigned long psci_0_1_handler(u64 func_id, struct kvm_cpu_context *host_ctxt) > > { > > - return PSCI_RET_NOT_SUPPORTED; > > + if (func_id == kvm_host_psci_function_id[PSCI_FN_CPU_OFF]) > > + return psci_forward(host_ctxt); > > + else if (func_id == kvm_host_psci_function_id[PSCI_FN_MIGRATE]) > > + return psci_forward(host_ctxt); > > Looks weird or I am not seeing something right ? Same action for both > right ? Can't they be combined ? Sure, happy to combine them. I thought visually it made sense to have one action per ID. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel