[Xen-devel] [PATCH 00/12] arm64: Mediate access to GICv3 sysregs at EL2

[mjaggi@xxxxxxxxxxxxxxxxxx]

From: Manish Jaggi <manish.jaggi@xxxxxxxxxx>

This patchset is a Xen port of Marc's patchset.
arm64: KVM: Mediate access to GICv3 sysregs at EL2 [1]

The current RFC patchset is a subset of [1], as it handleing only Group1 traps
as a PoC. Most of the trap code is added in vsysreg.c. Trap handler function is 
kept
independent of the usual guest trap handling code. 
Looking for feedback on this approach.  

The errata has been validated on Cavium ThunderX platform.

Steps to reporduce the errata
- Boot Xen with 2 cores.
- Disable group1 interrupts in domU kernel
- start domU, the kill and start again.
One of the Xen core would hang.

Code in this patchset fixes this issue.

[1] https://lists.cs.columbia.edu/pipermail/kvmarm/2017-June/026029.html

Changes from RFC
- Added commit information on ported patches from linux
- Added skip_hyp_tail to control calling leave_hypervisor_tail 
- Added CAVIUM_CONFIG_ERRATUM_30115 which will auto enable workaround

Manish Jaggi (12):
  arm:Kconfig Rename menu text
  arm64: cputype: Add MIDR values for Cavium ThunderX1 CPUs
  arm64: Add config for Cavium Thunder erratum 30115
  Enable Group1 Traps by default for Cavium ThunderX
  Placeholder for handling Group1 register traps
  arm64: vgic-v3: Add ICV_BPR1_EL1 handler
  arm64: vgic-v3: Add ICV_IGRPEN1_EL1 handler
  arm64: Add accessors for the ICH_APxRn_EL2 registers
  Expose ich_read/write_lr in vsysreg_errata.c
  arm64: Add ICV_IAR1_EL1 handler
  arm64: vgic-v3: Add ICV_EOIR1_EL1 handler
  arm64: vgic-v3: Add ICV_HPPIR1_EL1 handler

 xen/arch/arm/Kconfig                |   6 +-
 xen/arch/arm/arm64/Makefile         |   1 +
 xen/arch/arm/arm64/vsysreg_errata.c | 660 ++++++++++++++++++++++++++++++++++++
 xen/arch/arm/cpuerrata.c            |  21 ++
 xen/arch/arm/gic-v3.c               |  16 +-
 xen/arch/arm/traps.c                |  20 ++
 xen/include/asm-arm/arm64/sysregs.h |   5 +
 xen/include/asm-arm/arm64/traps.h   |   3 +-
 xen/include/asm-arm/cpuerrata.h     |   1 +
 xen/include/asm-arm/cpufeature.h    |   3 +-
 xen/include/asm-arm/current.h       |   1 +
 xen/include/asm-arm/gic.h           |   1 +
 xen/include/asm-arm/gic_v3_defs.h   |  29 ++
 xen/include/asm-arm/processor.h     |   9 +
 14 files changed, 771 insertions(+), 5 deletions(-)
 create mode 100644 xen/arch/arm/arm64/vsysreg_errata.c

-- 
2.14.1


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