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* | arm64: KVM: VHE: Make __fpsimd_enabled VHE awareMarc Zyngier2016-02-29
| | | | | | | | | | | | | | | | | | As non-VHE and VHE have different ways to express the trapping of FPSIMD registers to EL2, make __fpsimd_enabled a patchable predicate and provide a VHE implementation. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* | arm64: KVM: VHE: Enable minimal sysreg save/restoreMarc Zyngier2016-02-29
| | | | | | | | | | | | | | | | | | | | | | We're now in a position where we can introduce VHE's minimal save/restore, which is limited to the handful of shared sysregs. Add the required alternative function calls that result in a "do nothing" call on VHE, and the normal save/restore for non-VHE. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* | arm64: KVM: VHE: Use unified system register accessorsMarc Zyngier2016-02-29
| | | | | | | | | | | | | | | | | | Use the recently introduced unified system register accessors for those sysregs that behave differently depending on VHE being in use or not. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* | arm64: KVM: VHE: Split save/restore of registers shared between guest and hostMarc Zyngier2016-02-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A handful of system registers are still shared between host and guest, even while using VHE (tpidr*_el[01] and actlr_el1). Also, some of the vcpu state (sp_el0, PC and PSTATE) must be save/restored on entry/exit, as they are used on the host as well. In order to facilitate the introduction of a VHE-specific sysreg save/restore, make move the access to these registers to their own save/restore functions. No functional change. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* | arm64: KVM: VHE: Differenciate host/guest sysreg save/restoreMarc Zyngier2016-02-29
| | | | | | | | | | | | | | | | | | | | | | | | | | With ARMv8, host and guest share the same system register file, making the save/restore procedure completely symetrical. With VHE, host and guest now have different requirements, as they use different sysregs. In order to prepare for this, add split sysreg save/restore functions for both host and guest. No functional changes yet. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* | arm64: KVM: VHE: Introduce unified system register accessorsMarc Zyngier2016-02-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | VHE brings its own bag of new system registers, or rather system register accessors, as it define new ways to access both guest and host system registers. For example, from the host: - The host TCR_EL2 register is accessed using the TCR_EL1 accessor - The guest TCR_EL1 register is accessed using the TCR_EL12 accessor Obviously, this is confusing. A way to somehow reduce the complexity of writing code for both ARMv8 and ARMv8.1 is to use a set of unified accessors that will generate the right sysreg, depending on the mode the CPU is running in. For example: - read_sysreg_el1(tcr) will use TCR_EL1 on ARMv8, and TCR_EL12 on ARMv8.1 with VHE. - read_sysreg_el2(tcr) will use TCR_EL2 on ARMv8, and TCR_EL1 on ARMv8.1 with VHE. We end up with three sets of accessors ({read,write}_sysreg_el[012]) that can be directly used from C code. We take this opportunity to also add the definition for the new VHE sysregs. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* | arm64: KVM: VHE: Patch out kern_hyp_vaMarc Zyngier2016-02-29
| | | | | | | | | | | | | | | | | | | | | | | | The kern_hyp_va macro is pretty meaninless with VHE, as there is only one mapping - the kernel one. In order to keep the code readable and efficient, use runtime patching to replace the 'and' instruction used to compute the VA with a 'nop'. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* | arm64: KVM: VHE: Patch out use of HVCMarc Zyngier2016-02-29
| | | | | | | | | | | | | | | | | | | | With VHE, the host never issues an HVC instruction to get into the KVM code, as we can simply branch there. Use runtime code patching to simplify things a bit. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* | arm64: KVM: Switch to C-based stage2 initMarc Zyngier2016-02-29
| | | | | | | | | | | | | | | | | | | | | | There is no real need to leave the stage2 initialization as part of the early HYP bootstrap, and we can easily postpone it to the point where we can safely run C code. This will help VHE, which doesn't need any of this bootstrap. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* | arm64: KVM: vgic-v3: Restore ICH_APR0Rn_EL2 before ICH_APR1Rn_EL2Marc Zyngier2016-02-24
|/ | | | | | | | | | | | | | The GICv3 architecture spec says: Writing to the active priority registers in any order other than the following order will result in UNPREDICTABLE behavior: - ICH_AP0R<n>_EL2. - ICH_AP1R<n>_EL2. So let's not pointlessly go against the rule... Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* arm64: KVM: Obey RES0/1 reserved bits when setting CPTR_EL2Dave Martin2016-01-24
| | | | | | | | | | | | | | | | Some bits in CPTR are defined as RES1 in the architecture. Setting these bits to zero may unintentionally enable future architecture extensions, allowing guests to use them without supervision by the host. This would be bad: for forwards compatibility, this patch makes sure the affected bits are always written with 1, not 0. This patch only addresses CPTR_EL2. Initialisation of other system registers may still need review. Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* arm64: KVM: Remove weak attributesMarc Zyngier2015-12-14
| | | | | | | | | As we've now switched to the new world switch implementation, remove the weak attributes, as nobody is supposed to override it anymore. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* arm64: KVM: Turn system register numbers to an enumMarc Zyngier2015-12-14
| | | | | | | | | | | | Having the system register numbers as #defines has been a pain since day one, as the ordering is pretty fragile, and moving things around leads to renumbering and epic conflict resolutions. Now that we're mostly acessing the sysreg file in C, an enum is a much better type to use, and we can clean things up a bit. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
* arm64: KVM: Add compatibility aliasesMarc Zyngier2015-12-14
| | | | | | | | | | | | | | | | | | So far, we've implemented the new world switch with a completely different namespace, so that we could have both implementation compiled in. Let's take things one step further by adding weak aliases that have the same names as the original implementation. The weak attributes allows the new implementation to be overriden by the old one, and everything still work. At a later point, we'll be able to simply drop the old code, and everything will hopefully keep working, thanks to the aliases we have just added. This also saves us repainting all the callers. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
* arm64: KVM: Add panic handlingMarc Zyngier2015-12-14
| | | | | | | | Add the panic handler, together with the small bits of assembly code to call the kernel's panic implementation. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
* arm64: KVM: HYP mode entry pointsMarc Zyngier2015-12-14
| | | | | | | | Add the entry points for HYP mode (both for hypercalls and exception handling). Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
* arm64: KVM: Implement TLB handlingMarc Zyngier2015-12-14
| | | | | | | | Implement the TLB handling as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
* arm64: KVM: Implement fpsimd save/restoreMarc Zyngier2015-12-14
| | | | | | | | Implement the fpsimd save restore, keeping the lazy part in assembler (as returning to C would be overkill). Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
* arm64: KVM: Implement the core world switchMarc Zyngier2015-12-14
| | | | | | | | | | Implement the core of the world switch in C. Not everything is there yet, and there is nothing to re-enter the world switch either. But this already outlines the code structure well enough. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
* arm64: KVM: Add patchable function selectorMarc Zyngier2015-12-14
| | | | | | | | | | | | | KVM so far relies on code patching, and is likely to use it more in the future. The main issue is that our alternative system works at the instruction level, while we'd like to have alternatives at the function level. In order to cope with this, add the "hyp_alternate_select" macro that outputs a brief sequence of code that in turn can be patched, allowing an alternative function to be selected. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* arm64: KVM: Implement guest entryMarc Zyngier2015-12-14
| | | | | | | | | Contrary to the previous patch, the guest entry is fairly different from its assembly counterpart, mostly because it is only concerned with saving/restoring the GP registers, and nothing else. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* arm64: KVM: Implement debug save/restoreMarc Zyngier2015-12-14
| | | | | | | | | | Implement the debug save restore as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Tested-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
* arm64: KVM: Implement 32bit system register save/restoreMarc Zyngier2015-12-14
| | | | | | | | Implement the 32bit system register save/restore as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
* arm64: KVM: Implement system register save/restoreMarc Zyngier2015-12-14
| | | | | | | | Implement the system register save/restore as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
* arm64: KVM: Implement timer save/restoreMarc Zyngier2015-12-14
| | | | | | | Implement the timer save restore as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* arm64: KVM: Implement vgic-v3 save/restoreMarc Zyngier2015-12-14
| | | | | | | Implement the vgic-v3 save restore as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* arm64: KVM: Implement vgic-v2 save/restoreMarc Zyngier2015-12-14
| | | | | | | Implement the vgic-v2 save restore (mostly) as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* arm64: KVM: Add a HYP-specific header fileMarc Zyngier2015-12-14
In order to expose the various EL2 services that are private to the hypervisor, add a new hyp.h file. So far, it only contains mundane things such as section annotation and VA manipulation. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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