kernel/arch/arm64/kvm/hyp/nvhe/debug-sr.c, branch linux-6.2.y

KVM: arm64: Move vcpu debug/SPE/TRBE flags to the input flag set

2022-06-29T09:23:03Z

The three debug flags (which deal with the debug registers, SPE and TRBE) all are input flags to the hypervisor code. Move them into the input set and convert them to the new accessors. Reviewed-by: Fuad Tabba Reviewed-by: Reiji Watanabe Signed-off-by: Marc Zyngier

KVM: arm64: MDCR_EL2 is a 64-bit register

2021-08-20T10:12:17Z

Fix the places in KVM that treat MDCR_EL2 as a 32-bit register. More recent features (e.g., FEAT_SPEv1p2) use bits above 31. No functional change intended. Acked-by: Will Deacon Signed-off-by: Fuad Tabba Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20210817081134.2918285-4-tabba@google.com

arm64: KVM: Enable access to TRBE support for host

2021-04-06T22:05:28Z

For a nvhe host, the EL2 must allow the EL1&0 translation regime for TraceBuffer (MDCR_EL2.E2TB == 0b11). This must be saved/restored over a trip to the guest. Also, before entering the guest, we must flush any trace data if the TRBE was enabled. And we must prohibit the generation of trace while we are in EL1 by clearing the TRFCR_EL1. For vhe, the EL2 must prevent the EL1 access to the Trace Buffer. The MDCR_EL2 bit definitions for TRBE are available here : https://developer.arm.com/documentation/ddi0601/2020-12/AArch64-Registers/ Cc: Will Deacon Cc: Catalin Marinas Cc: Marc Zyngier Cc: Mark Rutland Cc: Anshuman Khandual Signed-off-by: Suzuki K Poulose Acked-by: Marc Zyngier Link: https://lore.kernel.org/r/20210405164307.1720226-8-suzuki.poulose@arm.com Signed-off-by: Mathieu Poirier

KVM: arm64: Move SPE availability check to VCPU load

2021-04-06T22:05:20Z

At the moment, we check the availability of SPE on the given CPU (i.e, SPE is implemented and is allowed at the host) during every guest entry. This can be optimized a bit by moving the check to vcpu_load time and recording the availability of the feature on the current CPU via a new flag. This will also be useful for adding the TRBE support. Cc: Marc Zyngier Cc: Will Deacon Cc: Alexandru Elisei Cc: James Morse Signed-off-by: Suzuki K Poulose Acked-by: Marc Zyngier Link: https://lore.kernel.org/r/20210405164307.1720226-7-suzuki.poulose@arm.com Signed-off-by: Mathieu Poirier

KVM: arm64: nvhe: Save the SPE context early

2021-03-06T09:18:39Z

The nVHE KVM hyp drains and disables the SPE buffer, before entering the guest, as the EL1&0 translation regime is going to be loaded with that of the guest. But this operation is performed way too late, because : - The owning translation regime of the SPE buffer is transferred to EL2. (MDCR_EL2_E2PB == 0) - The guest Stage1 is loaded. Thus the flush could use the host EL1 virtual address, but use the EL2 translations instead of host EL1, for writing out any cached data. Fix this by moving the SPE buffer handling early enough. The restore path is doing the right thing. Fixes: 014c4c77aad7 ("KVM: arm64: Improve debug register save/restore flow") Cc: stable@vger.kernel.org Cc: Christoffer Dall Cc: Marc Zyngier Cc: Will Deacon Cc: Catalin Marinas Cc: Mark Rutland Cc: Alexandru Elisei Reviewed-by: Alexandru Elisei Signed-off-by: Suzuki K Poulose Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20210302120345.3102874-1-suzuki.poulose@arm.com Message-Id: <20210305185254.3730990-2-maz@kernel.org> Signed-off-by: Paolo Bonzini

KVM: arm64: Remove __hyp_text macro, use build rules instead

2020-07-05T17:38:45Z

With nVHE code now fully separated from the rest of the kernel, the effects of the __hyp_text macro (which had to be applied on all nVHE code) can be achieved with build rules instead. The macro used to: (a) move code to .hyp.text ELF section, now done by renaming .text using `objcopy`, and (b) `notrace` and `__noscs` would negate effects of CC_FLAGS_FTRACE and CC_FLAGS_SCS, respectivelly, now those flags are erased from KBUILD_CFLAGS (same way as in EFI stub). Note that by removing __hyp_text from code shared with VHE, all VHE code is now compiled into .text and without `notrace` and `__noscs`. Use of '.pushsection .hyp.text' removed from assembly files as this is now also covered by the build rules. For MAINTAINERS: if needed to re-run, uses of macro were removed with the following command. Formatting was fixed up manually. find arch/arm64/kvm/hyp -type f -name '*.c' -o -name '*.h' \ -exec sed -i 's/ __hyp_text//g' {} + Signed-off-by: David Brazdil Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20200625131420.71444-15-dbrazdil@google.com

KVM: arm64: Split hyp/debug-sr.c to VHE/nVHE

2020-07-05T17:38:25Z

debug-sr.c contains KVM's code for context-switching debug registers, with some code shared between VHE/nVHE. These common routines are moved to a header file, VHE-specific code is moved to vhe/debug-sr.c and nVHE-specific code to nvhe/debug-sr.c. Functions are slightly refactored to move code hidden behind `has_vhe()` checks to the corresponding .c files. Signed-off-by: David Brazdil Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20200625131420.71444-11-dbrazdil@google.com