[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v2 0/7] xen/arm: Emulate ID registers
The goal of this serie is to emulate coprocessor ID registers so that Xen only publish to guest features that are supported by Xen and can actually be used by guests. One practical example where this is required are SVE support which is forbidden by Xen as it is not supported, but if Linux is compiled with it, it will crash on boot. An other one is AMU which is also forbidden by Xen but one Linux compiled with it would crash if the platform supports it. To be able to emulate the coprocessor registers defining what features are supported by the hardware, the TID3 bit of HCR must be disabled and Xen must emulated the values of those registers when an exception is catched when a guest is accessing it. This serie is first creating a guest cpuinfo structure which will contain the values that we want to publish to the guests and then provides the proper emulationg for those registers when Xen is getting an exception due to an access to any of those registers. This is a first simple implementation to solve the problem and the way to define the values that we provide to guests and which features are disabled will be in a future patchset enhance so that we could decide per guest what can be used or not and depending on this deduce the bits to activate in HCR and the values that we must publish on ID registers. --- Changes in V2: Fix First patch to properly handle DFR1 register and increase dbg32 size. Other patches have just been rebased. Bertrand Marquis (7): xen/arm: Add ID registers and complete cpufinfo xen/arm: Add arm64 ID registers definitions xen/arm: create a cpuinfo structure for guest xen/arm: Add handler for ID registers on arm64 xen/arm: Add handler for cp15 ID registers xen/arm: Add CP10 exception support to handle VMFR xen/arm: Activate TID3 in HCR_EL2 xen/arch/arm/arm64/vsysreg.c | 49 +++++++++++++++++++ xen/arch/arm/cpufeature.c | 68 +++++++++++++++++++++++++++ xen/arch/arm/traps.c | 7 ++- xen/arch/arm/vcpreg.c | 73 +++++++++++++++++++++++++++++ xen/include/asm-arm/arm64/hsr.h | 37 +++++++++++++++ xen/include/asm-arm/arm64/sysregs.h | 25 ++++++++++ xen/include/asm-arm/cpregs.h | 11 +++++ xen/include/asm-arm/cpufeature.h | 65 +++++++++++++++++++++---- xen/include/asm-arm/perfc_defn.h | 1 + xen/include/asm-arm/traps.h | 1 + 10 files changed, 327 insertions(+), 10 deletions(-) -- 2.17.1
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