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Wed, 11 Nov 2020 14:32:50 +0000 MIME-Version: 1.0 Date: Wed, 11 Nov 2020 14:32:50 +0000 From: Marc Zyngier To: David Brazdil Subject: Re: [PATCH v1 00/24] Opt-in always-on nVHE hypervisor In-Reply-To: <20201109113233.9012-1-dbrazdil@google.com> References: <20201109113233.9012-1-dbrazdil@google.com> User-Agent: Roundcube Webmail/1.4.9 Message-ID: <60c7254e3e667486298c11ddccca4f13@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: dbrazdil@google.com, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, catalin.marinas@arm.com, will@kernel.org, dennis@kernel.org, tj@kernel.org, cl@linux.com, mark.rutland@arm.com, lorenzo.pieralisi@arm.com, qperret@google.com, ascull@google.com, qwandor@google.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 Cc: kernel-team@android.com, Lorenzo Pieralisi , Andrew Walbran , Catalin Marinas , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Tejun Heo , Dennis Zhou , Christoph Lameter , Will Deacon , kvmarm@lists.cs.columbia.edu X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Hi David, On 2020-11-09 11:32, David Brazdil wrote: > As we progress towards being able to keep guest state private to the > host running nVHE hypervisor, this series allows the hypervisor to > install itself on newly booted CPUs before the host is allowed to run > on them. > > All functionality described below is opt-in, guarded by an early param > 'kvm-arm.protected'. Future patches specific to the new "protected" > mode > should be hidden behind the same param. > > The hypervisor starts trapping host SMCs and intercepting host's PSCI > CPU_ON/OFF/SUSPEND calls. It replaces the host's entry point with its > own, initializes the EL2 state of the new CPU and installs the nVHE hyp > vector before ERETing to the host's entry point. > > The kernel checks new cores' features against the finalized system > capabilities. To avoid the need to move this code/data to EL2, the > implementation only allows to boot cores that were online at the time > of > KVM initialization and therefore had been checked already. > > Other PSCI SMCs are forwarded to EL3, though only the known set of SMCs > implemented in the kernel is allowed. Non-PSCI SMCs are also forwarded > to EL3. Future changes will need to ensure the safety of all SMCs wrt. > private guests. > > The host is still allowed to reset EL2 back to the stub vector, eg. for > hibernation or kexec, but will not disable nVHE when there are no VMs. > > Tested on Rock Pi 4b, based on 5.10-rc3. I think I've gone through most of the patches. When you respin this series, you may want to do so on top of my host EL2 entry rework [1], which change a few things you currently rely on. If anything in there doesn't work for you, please let me know. Thanks, M. [1] https://lore.kernel.org/kvm/20201109175923.445945-1-maz@kernel.org/ -- Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm