- 16 May, 2022 6 commits
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Marc Zyngier authored
* kvm-arm64/per-vcpu-host-pmu-data: : . : Pass the host PMU state in the vcpu to avoid the use of additional : shared memory between EL1 and EL2 (this obviously only applies : to nVHE and Protected setups). : : Patches courtesy of Fuad Tabba. : . KVM: arm64: pmu: Restore compilation when HW_PERF_EVENTS isn't selected KVM: arm64: Reenable pmu in Protected Mode KVM: arm64: Pass pmu events to hyp via vcpu KVM: arm64: Repack struct kvm_pmu to reduce size KVM: arm64: Wrapper for getting pmu_events Signed-off-by:Marc Zyngier <maz@kernel.org>
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Marc Zyngier authored
* kvm-arm64/vgic-invlpir: : . : Implement MMIO-based LPI invalidation for vGICv3. : . KVM: arm64: vgic-v3: Advertise GICR_CTLR.{IR, CES} as a new GICD_IIDR revision KVM: arm64: vgic-v3: Implement MMIO-based LPI invalidation KVM: arm64: vgic-v3: Expose GICR_CTLR.RWP when disabling LPIs irqchip/gic-v3: Exposes bit values for GICR_CTLR.{IR, CES} Signed-off-by: -
Marc Zyngier authored
* kvm-arm64/psci-suspend: : . : Add support for PSCI SYSTEM_SUSPEND and allow userspace to : filter the wake-up events. : : Patches courtesy of Oliver. : . Documentation: KVM: Fix title level for PSCI_SUSPEND selftests: KVM: Test SYSTEM_SUSPEND PSCI call selftests: KVM: Refactor psci_test to make it amenable to new tests selftests: KVM: Use KVM_SET_MP_STATE to power off vCPU in psci_test selftests: KVM: Create helper for making SMCCC calls selftests: KVM: Rename psci_cpu_on_test to psci_test KVM: arm64: Implement PSCI SYSTEM_SUSPEND KVM: arm64: Add support for userspace to suspend a vCPU KVM: arm64: Return a value from check_vcpu_requests() KVM: arm64: Rename the KVM_REQ_SLEEP handler KVM: arm64: Track vCPU power state using MP state values KVM: arm64: Dedupe vCPU power off helpers KVM: arm64: Don't depend on fallthrough to hide SYSTEM_RESET2 Signed-off-by: -
Marc Zyngier authored
* kvm-arm64/hcall-selection: : . : Introduce a new set of virtual sysregs for userspace to : select the hypercalls it wants to see exposed to the guest. : : Patches courtesy of Raghavendra and Oliver. : . KVM: arm64: Fix hypercall bitmap writeback when vcpus have already run KVM: arm64: Hide KVM_REG_ARM_*_BMAP_BIT_COUNT from userspace Documentation: Fix index.rst after psci.rst renaming selftests: KVM: aarch64: Add the bitmap firmware registers to get-reg-list selftests: KVM: aarch64: Introduce hypercall ABI test selftests: KVM: Create helper for making SMCCC calls selftests: KVM: Rename psci_cpu_on_test to psci_test tools: Import ARM SMCCC definitions Docs: KVM: Add doc for the bitmap firmware registers Docs: KVM: Rename psci.rst to hypercalls.rst KVM: arm64: Add vendor hypervisor firmware register KVM: arm64: Add standard hypervisor firmware register KVM: arm64: Setup a framework for hypercall bitmap firmware registers KVM: arm64: Factor out firmware register handling from psci.c Signed-off-by: -
Marc Zyngier authored
We generally want to disallow hypercall bitmaps being changed once vcpus have already run. But we must allow the write if the written value is unchanged so that userspace can rewrite the register file on reboot, for example. Without this, a QEMU-based VM will fail to reboot correctly. The original code was correct, and it is me that introduced the regression. Fixes: 05714cab ("KVM: arm64: Setup a framework for hypercall bitmap firmware registers") Signed-off-by:
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Marc Zyngier authored
Moving kvm_pmu_events into the vcpu (and refering to it) broke the somewhat unusual case where the kernel has no support for a PMU at all. In order to solve this, move things around a bit so that we can easily avoid refering to the pmu structure outside of PMU-aware code. As a bonus, pmu.c isn't compiled in when HW_PERF_EVENTS isn't selected. Reported-by:
kernel test robot <lkp@intel.com> Reviewed-by:
Fuad Tabba <tabba@google.com> Signed-off-by:
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- 15 May, 2022 5 commits
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Marc Zyngier authored
These constants will change over time, and userspace has no business knowing about them. Hide them behind __KERNEL__. Signed-off-by: -
Fuad Tabba authored
Now that the pmu code does not access hyp data, reenable it in protected mode. Once fully supported, protected VMs will not have pmu support, since that could leak information. However, non-protected VMs in protected mode should have pmu support if available. Signed-off-by:
Oliver Upton <oupton@google.com> Signed-off-by:
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Fuad Tabba authored
Instead of the host accessing hyp data directly, pass the pmu events of the current cpu to hyp via the vcpu. This adds 64 bits (in two fields) to the vcpu that need to be synced before every vcpu run in nvhe and protected modes. However, it isolates the hypervisor from the host, which allows us to use pmu in protected mode in a subsequent patch. No visible side effects in behavior intended. Signed-off-by:
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Fuad Tabba authored
struct kvm_pmu has 2 holes using 10 bytes. This is instantiated in all vcpus, so it adds up. Repack the structures to remove the holes. No functional change intended. Reviewed-by:
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Fuad Tabba authored
Eases migrating away from using hyp data and simplifies the code. No functional change intended. Reviewed-by:
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- 05 May, 2022 1 commit
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Stephen Rothwell authored
The htmldoc build breaks in a funny way with: <quote> Sphinx parallel build error: docutils.utils.SystemMessage: /home/sfr/next/next/Documentation/virt/kvm/api.rst:6175: (SEVERE/4) Title level inconsistent: For arm/arm64: ^^^^^^^^^^^^^^ </quote> Swap the ^^s for a bunch of --s... Signed-off-by:
Stephen Rothwell <sfr@canb.auug.org.au> [maz: commit message] Signed-off-by:
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- 04 May, 2022 22 commits
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Marc Zyngier authored
Since adversising GICR_CTLR.{IC,CES} is directly observable from a guest, we need to make it selectable from userspace. For that, bump the default GICD_IIDR revision and let userspace downgrade it to the previous default. For GICv2, the two distributor revisions are strictly equivalent. Signed-off-by: -
Marc Zyngier authored
Since GICv4.1, it has become legal for an implementation to advertise GICR_{INVLPIR,INVALLR,SYNCR} while having an ITS, allowing for a more efficient invalidation scheme (no guest command queue contention when multiple CPUs are generating invalidations). Provide the invalidation registers as a primitive to their ITS counterpart. Note that we don't advertise them to the guest yet (the architecture allows an implementation to do this). Signed-off-by: -
Marc Zyngier authored
When disabling LPIs, a guest needs to poll GICR_CTLR.RWP in order to be sure that the write has taken effect. We so far reported it as 0, as we didn't advertise that LPIs could be turned off the first place. Start tracking this state during which LPIs are being disabled, and expose the 'in progress' state via the RWP bit. We also take this opportunity to disallow enabling LPIs and programming GICR_{PEND,PROP}BASER while LPI disabling is in progress, as allowed by the architecture (UNPRED behaviour). We don't advertise the feature to the guest yet (which is allowed by the architecture). Reviewed-by: -
Marc Zyngier authored
As we're about to expose GICR_CTLR.{IR,CES} to guests, populate the include file with the architectural values. Signed-off-by: -
Marc Zyngier authored
Fix the TOC in index.rst after psci.rst has been renamed to hypercalls.rst. Signed-off-by:
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Marc Zyngier authored
* kvm-arm64/aarch32-idreg-trap: : . : Add trapping/sanitising infrastructure for AArch32 systen registers, : allowing more control over what we actually expose (such as the PMU). : : Patches courtesy of Oliver and Alexandru. : . KVM: arm64: Fix new instances of 32bit ESRs KVM: arm64: Hide AArch32 PMU registers when not available KVM: arm64: Start trapping ID registers for 32 bit guests KVM: arm64: Plumb cp10 ID traps through the AArch64 sysreg handler KVM: arm64: Wire up CP15 feature registers to their AArch64 equivalents KVM: arm64: Don't write to Rt unless sys_reg emulation succeeds KVM: arm64: Return a bool from emulate_cp() Signed-off-by: -
Marc Zyngier authored
* kvm-arm64/hyp-stack-guard: : . : Harden the EL2 stack by providing stack guards, courtesy of : Kalesh Singh. : . KVM: arm64: Symbolize the nVHE HYP addresses KVM: arm64: Detect and handle hypervisor stack overflows KVM: arm64: Add guard pages for pKVM (protected nVHE) hypervisor stack KVM: arm64: Add guard pages for KVM nVHE hypervisor stack KVM: arm64: Introduce pkvm_alloc_private_va_range() KVM: arm64: Introduce hyp_alloc_private_va_range() Signed-off-by: -
Marc Zyngier authored
* kvm-arm64/wfxt: : . : Add support for the WFET/WFIT instructions that provide the same : service as WFE/WFI, only with a timeout. : . KVM: arm64: Expose the WFXT feature to guests KVM: arm64: Offer early resume for non-blocking WFxT instructions KVM: arm64: Handle blocking WFIT instruction KVM: arm64: Introduce kvm_counter_compute_delta() helper KVM: arm64: Simplify kvm_cpu_has_pending_timer() arm64: Use WFxT for __delay() when possible arm64: Add wfet()/wfit() helpers arm64: Add HWCAP advertising FEAT_WFXT arm64: Add RV and RN fields for ESR_ELx_WFx_ISS arm64: Expand ESR_ELx_WFx_ISS_TI to match its ARMv8.7 definition Signed-off-by: -
Marc Zyngier authored
Merge arm64's SME branch to resolve conflicts with the WFxT branch. Signed-off-by: -
Oliver Upton authored
Assert that the vCPU exits to userspace with KVM_SYSTEM_EVENT_SUSPEND if the guest calls PSCI SYSTEM_SUSPEND. Additionally, guarantee that the SMC32 and SMC64 flavors of this call are discoverable with the PSCI_FEATURES call. Signed-off-by:
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Oliver Upton authored
Split up the current test into several helpers that will be useful to subsequent test cases added to the PSCI test suite. Signed-off-by:
Andrew Jones <drjones@redhat.com> Signed-off-by:
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Oliver Upton authored
Setting a vCPU's MP state to KVM_MP_STATE_STOPPED has the effect of powering off the vCPU. Rather than using the vCPU init feature flag, use the KVM_SET_MP_STATE ioctl to power off the target vCPU. Signed-off-by:
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Oliver Upton authored
The PSCI and PV stolen time tests both need to make SMCCC calls within the guest. Create a helper for making SMCCC calls and rework the existing tests to use the library function. Signed-off-by:
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Oliver Upton authored
There are other interactions with PSCI worth testing; rename the PSCI test to make it more generic. No functional change intended. Signed-off-by:
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Oliver Upton authored
ARM DEN0022D.b 5.19 "SYSTEM_SUSPEND" describes a PSCI call that allows software to request that a system be placed in the deepest possible low-power state. Effectively, software can use this to suspend itself to RAM. Unfortunately, there really is no good way to implement a system-wide PSCI call in KVM. Any precondition checks done in the kernel will need to be repeated by userspace since there is no good way to protect a critical section that spans an exit to userspace. SYSTEM_RESET and SYSTEM_OFF are equally plagued by this issue, although no users have seemingly cared for the relatively long time these calls have been supported. The solution is to just make the whole implementation userspace's problem. Introduce a new system event, KVM_SYSTEM_EVENT_SUSPEND, that indicates to userspace a calling vCPU has invoked PSCI SYSTEM_SUSPEND. Additionally, add a CAP to get buy-in from userspace for this new exit type. Only advertise the SYSTEM_SUSPEND PSCI call if userspace has opted in. If a vCPU calls SYSTEM_SUSPEND, punt straight to userspace. Provide explicit documentation of userspace's responsibilites for the exit and point to the PSCI specification to describe the actual PSCI call. Reviewed-by:
Reiji Watanabe <reijiw@google.com> Signed-off-by:
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Oliver Upton authored
Introduce a new MP state, KVM_MP_STATE_SUSPENDED, which indicates a vCPU is in a suspended state. In the suspended state the vCPU will block until a wakeup event (pending interrupt) is recognized. Add a new system event type, KVM_SYSTEM_EVENT_WAKEUP, to indicate to userspace that KVM has recognized one such wakeup event. It is the responsibility of userspace to then make the vCPU runnable, or leave it suspended until the next wakeup event. Signed-off-by:
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Oliver Upton authored
A subsequent change to KVM will introduce a vCPU request that could result in an exit to userspace. Change check_vcpu_requests() to return a value and document the function. Unconditionally return 1 for now. Signed-off-by:
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Oliver Upton authored
The naming of the kvm_req_sleep function is confusing: the function itself sleeps the vCPU, it does not request such an event. Rename the function to make its purpose more clear. No functional change intended. Signed-off-by:
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Oliver Upton authored
A subsequent change to KVM will add support for additional power states. Store the MP state by value rather than keeping track of it as a boolean. No functional change intended. Signed-off-by:
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Oliver Upton authored
vcpu_power_off() and kvm_psci_vcpu_off() are equivalent; rename the former and replace all callsites to the latter. No functional change intended. Signed-off-by:
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Oliver Upton authored
Depending on a fallthrough to the default case for hiding SYSTEM_RESET2 requires that any new case statements clean up the failure path for this PSCI call. Unhitch SYSTEM_RESET2 from the default case by setting val to PSCI_RET_NOT_SUPPORTED outside of the switch statement. Apply the cleanup to both the PSCI_1_1_FN_SYSTEM_RESET2 and PSCI_1_0_FN_PSCI_FEATURES handlers. No functional change intended. Signed-off-by:
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Marc Zyngier authored
Fix the new instances of ESR being described as a u32, now that we consistently are using a u64 for this register. Signed-off-by:
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- 03 May, 2022 6 commits
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Raghavendra Rao Ananta authored
Add the psuedo-firmware registers KVM_REG_ARM_STD_BMAP, KVM_REG_ARM_STD_HYP_BMAP, and KVM_REG_ARM_VENDOR_HYP_BMAP to the base_regs[] list. Also, add the COPROC support for KVM_REG_ARM_FW_FEAT_BMAP. Signed-off-by:
Raghavendra Rao Ananta <rananta@google.com> Signed-off-by:
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Raghavendra Rao Ananta authored
Introduce a KVM selftest to check the hypercall interface for arm64 platforms. The test validates the user-space' [GET|SET]_ONE_REG interface to read/write the psuedo-firmware registers as well as its effects on the guest upon certain configurations. Signed-off-by:
Gavin Shan <gshan@redhat.com> Signed-off-by:
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Oliver Upton authored
The PSCI and PV stolen time tests both need to make SMCCC calls within the guest. Create a helper for making SMCCC calls and rework the existing tests to use the library function. Signed-off-by:
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Oliver Upton authored
There are other interactions with PSCI worth testing; rename the PSCI test to make it more generic. No functional change intended. Signed-off-by:
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Raghavendra Rao Ananta authored
Import the standard SMCCC definitions from include/linux/arm-smccc.h. Signed-off-by:
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Raghavendra Rao Ananta authored
Add the documentation for the bitmap firmware registers in hypercalls.rst and api.rst. This includes the details for KVM_REG_ARM_STD_BMAP, KVM_REG_ARM_STD_HYP_BMAP, and KVM_REG_ARM_VENDOR_HYP_BMAP registers. Since the document is growing to carry other hypercall related information, make necessary adjustments to present the document in a generic sense, rather than being PSCI focused. Signed-off-by:
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