From: Mark Brown <broonie@kernel.org>
To: Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
Joey Gouly <joey.gouly@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Will Deacon <will@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Jonathan Corbet <corbet@lwn.net>, Shuah Khan <shuah@kernel.org>
Cc: Dave Martin <Dave.Martin@arm.com>, Fuad Tabba <tabba@google.com>,
Mark Rutland <mark.rutland@arm.com>,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org,
Mark Brown <broonie@kernel.org>
Subject: [PATCH v4 19/27] KVM: arm64: Provide assembly for SME state restore
Date: Fri, 14 Feb 2025 01:58:02 +0000 [thread overview]
Message-ID: <20250214-kvm-arm64-sme-v4-19-d64a681adcc2@kernel.org> (raw)
In-Reply-To: <20250214-kvm-arm64-sme-v4-0-d64a681adcc2@kernel.org>
Provide a __sme_restore_state() for the hypervisor to allow it to restore
ZA and ZT for guests.
Signed-off-by: Mark Brown <broonie@kernel.org>
---
arch/arm64/include/asm/kvm_hyp.h | 2 ++
arch/arm64/kvm/hyp/fpsimd.S | 16 ++++++++++++++++
2 files changed, 18 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index 21943cb98542750a1b626a8de6bbc095d7770ccf..5a1f8e4be18624efa6b887f09c36f0e8ad318c40 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -113,6 +113,8 @@ void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
void __sve_save_state(void *sve_pffr, u32 *fpsr, int save_ffr);
void __sve_restore_state(void *sve_pffr, u32 *fpsr, int restore_ffr);
+int __sve_get_vl(void);
+void __sme_restore_state(void const *state, bool restore_zt);
u64 __guest_enter(struct kvm_vcpu *vcpu);
diff --git a/arch/arm64/kvm/hyp/fpsimd.S b/arch/arm64/kvm/hyp/fpsimd.S
index 6e16cbfc5df27e63732655dffea60d7039c37332..b21809adfba78522410da053fd4eccbb66484532 100644
--- a/arch/arm64/kvm/hyp/fpsimd.S
+++ b/arch/arm64/kvm/hyp/fpsimd.S
@@ -29,3 +29,19 @@ SYM_FUNC_START(__sve_save_state)
sve_save 0, x1, x2, 3
ret
SYM_FUNC_END(__sve_save_state)
+
+SYM_FUNC_START(__sve_get_vl)
+ _sve_rdvl 0, 1
+ ret
+SYM_FUNC_END(__sve_get_vl)
+
+SYM_FUNC_START(__sme_restore_state)
+ _sme_rdsvl 2, 1 // x2 = VL/8
+ sme_load_za 0, x2, 12 // Leaves x0 pointing to end of ZA
+
+ cbz x1, 1f
+ _ldr_zt 0
+
+1:
+ ret
+SYM_FUNC_END(__sme_restore_state)
--
2.39.5
next prev parent reply other threads:[~2025-02-14 2:02 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-14 1:57 [PATCH v4 00/27] KVM: arm64: Implement support for SME in non-protected guests Mark Brown
2025-02-14 1:57 ` [PATCH v4 01/27] arm64/fpsimd: Update FA64 and ZT0 enables when loading SME state Mark Brown
2025-02-14 1:57 ` [PATCH v4 02/27] arm64/fpsimd: Decide to save ZT0 and streaming mode FFR at bind time Mark Brown
2025-02-14 1:57 ` [PATCH v4 03/27] arm64/fpsimd: Check enable bit for FA64 when saving EFI state Mark Brown
2025-02-14 1:57 ` [PATCH v4 04/27] arm64/fpsimd: Determine maximum virtualisable SME vector length Mark Brown
2025-02-14 1:57 ` [PATCH v4 05/27] KVM: arm64: Introduce non-UNDEF FGT control Mark Brown
2025-02-14 1:57 ` [PATCH v4 06/27] KVM: arm64: Pay attention to FFR parameter in SVE save and load Mark Brown
2025-02-14 1:57 ` [PATCH v4 07/27] KVM: arm64: Pull ctxt_has_ helpers to start of sysreg-sr.h Mark Brown
2025-02-14 1:57 ` [PATCH v4 08/27] KVM: arm64: Move SVE state access macros after feature test macros Mark Brown
2025-02-14 1:57 ` [PATCH v4 09/27] KVM: arm64: Rename SVE finalization constants to be more general Mark Brown
2025-02-14 1:57 ` [PATCH v4 10/27] KVM: arm64: Document the KVM ABI for SME Mark Brown
2025-02-14 1:57 ` [PATCH v4 11/27] KVM: arm64: Define internal features " Mark Brown
2025-02-14 1:57 ` [PATCH v4 12/27] KVM: arm64: Rename sve_state_reg_region Mark Brown
2025-02-14 1:57 ` [PATCH v4 13/27] KVM: arm64: Store vector lengths in an array Mark Brown
2025-02-14 1:57 ` [PATCH v4 14/27] KVM: arm64: Implement SME vector length configuration Mark Brown
2025-02-14 1:57 ` [PATCH v4 15/27] KVM: arm64: Support SME control registers Mark Brown
2025-02-14 1:57 ` [PATCH v4 16/27] KVM: arm64: Support TPIDR2_EL0 Mark Brown
2025-02-14 1:58 ` [PATCH v4 17/27] KVM: arm64: Support SME identification registers for guests Mark Brown
2025-02-14 1:58 ` [PATCH v4 18/27] KVM: arm64: Support SME priority registers Mark Brown
2025-02-14 1:58 ` Mark Brown [this message]
2025-02-14 1:58 ` [PATCH v4 20/27] KVM: arm64: Support userspace access to streaming mode Z and P registers Mark Brown
2025-02-14 1:58 ` [PATCH v4 21/27] KVM: arm64: Expose SME specific state to userspace Mark Brown
2025-02-14 1:58 ` [PATCH v4 22/27] KVM: arm64: Context switch SME state for normal guests Mark Brown
2025-02-14 1:58 ` [PATCH v4 23/27] KVM: arm64: Handle SME exceptions Mark Brown
2025-02-14 1:58 ` [PATCH v4 24/27] KVM: arm64: Expose SME to nested guests Mark Brown
2025-02-14 1:58 ` [PATCH v4 25/27] KVM: arm64: Provide interface for configuring and enabling SME for guests Mark Brown
2025-02-14 1:58 ` [PATCH v4 26/27] KVM: arm64: selftests: Add SME system registers to get-reg-list Mark Brown
2025-02-14 1:58 ` [PATCH v4 27/27] KVM: arm64: selftests: Add SME to set_id_regs test Mark Brown
2025-02-14 9:24 ` [PATCH v4 00/27] KVM: arm64: Implement support for SME in non-protected guests Marc Zyngier
2025-02-14 15:13 ` Mark Brown
2025-02-17 9:37 ` Marc Zyngier
2025-02-18 22:54 ` Mark Brown
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