From: Itaru Kitayama <itaru.kitayama@fujitsu•com>
To: Wei-Lin Chang <weilin.chang@arm•com>
Cc: linux-arm-kernel@lists•infradead.org, kvmarm@lists•linux.dev,
linux-kernel@vger•kernel.org, Marc Zyngier <maz@kernel•org>,
Oliver Upton <oupton@kernel•org>, Joey Gouly <joey.gouly@arm•com>,
Suzuki K Poulose <suzuki.poulose@arm•com>,
Zenghui Yu <yuzenghui@huawei•com>,
Catalin Marinas <catalin.marinas@arm•com>,
Will Deacon <will@kernel•org>
Subject: Re: [PATCH v3 0/5] KVM: arm64: nv: Implement nested stage-2 reverse map
Date: Wed, 20 May 2026 16:31:12 +0900 [thread overview]
Message-ID: <ag1jQB3dRX0RSqbR@sm-arm-grace07> (raw)
In-Reply-To: <20260510145338.322962-1-weilin.chang@arm.com>
Hi Wei Lin,
On Sun, May 10, 2026 at 03:53:33PM +0100, Wei-Lin Chang wrote:
> Hi,
>
> This is v3 of optimizing the shadow s2 mmu unmapping during MMU
> notifiers.
>
> Two new preparatory patches are added, one reduces a hole in kvm_s2_mmu
> and another refactors the code a bit during s2 faults. Other changes are
> listed below.
>
> * Changes from v2 [1]:
>
> - Removed "polluted" teminology.
>
> - Use xa_{mk, to}_value() when storing and retriving values from maple
> trees.
>
> - Avoid using the 63rd bit in maple tree values so that xa_{mk, to}_value()
> does not lose us a bit.
>
> - Added reverse map removal during TLBI handling.
>
> - Other suggested refactorings.
>
> Thanks!
With this series applied on the recent kvmarm/fixes (minor local modification),
your v3 hello_nested runs fine on all three page granules; without this 16KB
kernel can't handle stage 2 unmapping paths. I tested using the latest QEMU only
so wonder how you're testing.
Thanks,
Itaru.
>
> [1]: https://lore.kernel.org/kvmarm/20260411125024.3735989-1-weilin.chang@arm.com/
>
> Wei-Lin Chang (5):
> KVM: arm64: Use a variable for the canonical GPA in kvm_s2_fault_map()
> KVM: arm64: Move shadow_pt_debugfs_dentry to reduce holes in
> kvm_s2_mmu
> KVM: arm64: nv: Avoid full shadow s2 unmap
> KVM: arm64: nv: Remove reverse map entries during TLBI handling
> KVM: arm64: nv: Create nested IPA direct map to speed up reverse map
> removal
>
> arch/arm64/include/asm/kvm_host.h | 17 +-
> arch/arm64/include/asm/kvm_nested.h | 6 +
> arch/arm64/kvm/mmu.c | 43 +++--
> arch/arm64/kvm/nested.c | 238 +++++++++++++++++++++++++++-
> arch/arm64/kvm/sys_regs.c | 3 +
> 5 files changed, 290 insertions(+), 17 deletions(-)
>
> --
> 2.43.0
>
next prev parent reply other threads:[~2026-05-20 7:31 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-10 14:53 [PATCH v3 0/5] KVM: arm64: nv: Implement nested stage-2 reverse map Wei-Lin Chang
2026-05-10 14:53 ` [PATCH v3 1/5] KVM: arm64: Use a variable for the canonical GPA in kvm_s2_fault_map() Wei-Lin Chang
2026-05-10 14:53 ` [PATCH v3 2/5] KVM: arm64: Move shadow_pt_debugfs_dentry to reduce holes in kvm_s2_mmu Wei-Lin Chang
2026-05-10 14:53 ` [PATCH v3 3/5] KVM: arm64: nv: Avoid full shadow s2 unmap Wei-Lin Chang
2026-05-28 12:59 ` Marc Zyngier
2026-05-10 14:53 ` [PATCH v3 4/5] KVM: arm64: nv: Remove reverse map entries during TLBI handling Wei-Lin Chang
2026-05-10 14:53 ` [PATCH v3 5/5] KVM: arm64: nv: Create nested IPA direct map to speed up reverse map removal Wei-Lin Chang
2026-06-04 7:24 ` Itaru Kitayama
2026-05-20 7:31 ` Itaru Kitayama [this message]
2026-05-28 10:19 ` [PATCH v3 0/5] KVM: arm64: nv: Implement nested stage-2 reverse map Marc Zyngier
2026-05-29 0:55 ` Itaru Kitayama
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