Oliver Upton e0b5a7967d KVM: arm64: nv: Use FGT write trap of MDSCR_EL1 when available ...

Marc reports that the performance of running an L3 guest has regressed
by 60% as a result of setting MDCR_EL2.TDA to hide bad architecture.
That's of course terrible for the single user of recursive NV ;-)

While there's nothing to be done on non-FGT systems, take advantage of
the precise write trap of MDSCR_EL1 and leave the rest of the debug
registers untrapped.

Reported-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>

2025-10-13 14:44:37 +01:00

..

hyp

KVM: arm64: Compute per-vCPU FGTs at vcpu_load()

2025-10-13 14:44:37 +01:00

vgic

KVM: arm64: gic-v3: Only set ICH_HCR traps for v2-on-v3 or v3 guests

2025-10-13 14:40:33 +01:00

.gitignore

…

arch_timer.c

KVM: arm64: Kill leftovers of ad-hoc timer userspace access

2025-10-13 14:42:41 +01:00

arm.c

KVM: arm64: Compute per-vCPU FGTs at vcpu_load()

2025-10-13 14:44:37 +01:00

at.c

KVM: arm64: Remove unreachable break after return

2025-10-13 14:17:03 +01:00

config.c

KVM: arm64: nv: Use FGT write trap of MDSCR_EL1 when available

2025-10-13 14:44:37 +01:00

debug.c

KVM: arm64: Guard PMSCR_EL1 initialization with SPE presence check

2025-10-13 14:26:36 +01:00

emulate-nested.c

Merge branch kvm-arm64/misc-6.18 into kvmarm-master/next

2025-09-20 12:26:29 +01:00

fpsimd.c

KVM: arm64: Remove kvm_arch_vcpu_run_map_fp()

2025-07-03 10:39:24 +01:00

guest.c

KVM: arm64: Kill leftovers of ad-hoc timer userspace access

2025-10-13 14:42:41 +01:00

handle_exit.c

KVM: arm64: Fix WFxT handling of nested virt

2025-10-13 14:42:41 +01:00

hypercalls.c

arm64: kvm, smccc: Introduce and use API for getting hypervisor UUID

2025-05-23 16:30:55 +00:00

inject_fault.c

KVM: arm64: Populate level on S1PTW SEA injection

2025-09-20 11:05:14 +01:00

Kconfig

Merge tag 'hyperv-next-signed-20251006' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

2025-10-07 08:40:15 -07:00

Makefile

KVM: arm64: gic-v5: Probe for GICv5

2025-07-08 14:41:06 -07:00

mmio.c

KVM: arm64: Don't retire MMIO instruction w/ pending (emulated) SError

2025-07-08 11:36:36 -07:00

mmu.c

Merge tag 'kvmarm-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

2025-09-30 13:23:28 -04:00

nested.c

KVM: arm64: nv: Use FGT write trap of MDSCR_EL1 when available

2025-10-13 14:44:37 +01:00

pauth.c

KVM: arm64: nv: Work around lack of pauth support in old toolchains

2024-04-23 19:27:11 +01:00

pkvm.c

Merge tag 'kvmarm-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

2025-09-30 13:23:28 -04:00

pmu-emul.c

KVM: arm64: Add RMW specific sysreg accessor

2025-06-05 14:18:01 +01:00

pmu.c

KVM: arm64: Use a cpucap to determine if system supports FEAT_PMUv3

2025-03-11 12:54:23 -07:00

psci.c

KVM: arm64: Add support for PSCI v1.2 and v1.3

2024-10-24 16:38:07 -07:00

ptdump.c

KVM: arm64: ptdump: Don't test PTE_VALID alongside other attributes

2025-09-08 20:01:21 +01:00

pvtime.c

…

reset.c

KVM: arm64: nv: Add pseudo-TLB backing VNCR_EL2

2025-05-19 07:59:46 +01:00

stacktrace.c

arm64: kvm: Introduce nvhe stack size constants

2025-01-08 11:25:28 +00:00

sys_regs.c

KVM: arm64: Move CNT*CT_EL0 userspace accessors to generic infrastructure

2025-10-13 14:42:41 +01:00

sys_regs.h

KVM: arm64: Add timer UAPI workaround to sysreg infrastructure

2025-10-13 14:42:40 +01:00

trace_arm.h

KVM: arm64: Replace ternary flags with str_on_off() helper

2025-05-06 09:38:37 +01:00

trace_handle_exit.h

arm64: kvm: trace_handle_exit: use string choices helper

2025-07-23 23:36:55 -07:00

trace.h

…

trng.c

…

va_layout.c

…

vgic-sys-reg-v3.c

KVM: arm64: Enforce the sorting of the GICv3 system register table

2025-07-26 08:36:58 -07:00

vmid.c

KVM: arm64: Ensure a VMID is allocated before programming VTTBR_EL2

2025-02-20 16:29:28 +00:00