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The upstream commit SHA1 provided is correct: 407a99c4654e8ea65393f412c421a55cac539f5b
WARNING: Author mismatch between patch and upstream commit:
Backport author: Mark Brown<broonie@xxxxxxxxxx>
Commit author: Mark Rutland<mark.rutland@xxxxxxx>
Note: The patch differs from the upstream commit:
---
1: 407a99c4654e8 ! 1: f237b7994caf9 KVM: arm64: Remove VHE host restore of CPACR_EL1.SMEN
@@ Metadata
## Commit message ##
KVM: arm64: Remove VHE host restore of CPACR_EL1.SMEN
+ [ Upstream commit 407a99c4654e8ea65393f412c421a55cac539f5b ]
+
When KVM is in VHE mode, the host kernel tries to save and restore the
configuration of CPACR_EL1.SMEN (i.e. CPTR_EL2.SMEN when HCR_EL2.E2H=1)
across kvm_arch_vcpu_load_fp() and kvm_arch_vcpu_put_fp(), since the
@@ Commit message
Reviewed-by: Oliver Upton <oliver.upton@xxxxxxxxx>
Link: https://lore.kernel.org/r/20250210195226.1215254-5-mark.rutland@xxxxxxx
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
+ [Update for rework of flags storage -- broonie]
+ Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
## arch/arm64/include/asm/kvm_host.h ##
-@@ arch/arm64/include/asm/kvm_host.h: struct cpu_sve_state {
- struct kvm_host_data {
- #define KVM_HOST_DATA_FLAG_HAS_SPE 0
- #define KVM_HOST_DATA_FLAG_HAS_TRBE 1
--#define KVM_HOST_DATA_FLAG_HOST_SME_ENABLED 3
- #define KVM_HOST_DATA_FLAG_TRBE_ENABLED 4
- #define KVM_HOST_DATA_FLAG_EL1_TRACING_CONFIGURED 5
- unsigned long flags;
+@@ arch/arm64/include/asm/kvm_host.h: struct kvm_vcpu_arch {
+ /* Save TRBE context if active */
+ #define DEBUG_STATE_SAVE_TRBE __vcpu_single_flag(iflags, BIT(6))
+
+-/* SME enabled for EL0 */
+-#define HOST_SME_ENABLED __vcpu_single_flag(sflags, BIT(1))
+ /* Physical CPU not in supported_cpus */
+ #define ON_UNSUPPORTED_CPU __vcpu_single_flag(sflags, BIT(2))
+ /* WFIT instruction trapped */
## arch/arm64/kvm/fpsimd.c ##
@@ arch/arm64/kvm/fpsimd.c: void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
@@ arch/arm64/kvm/fpsimd.c: void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
*host_data_ptr(fp_owner) = FP_STATE_FREE;
- if (system_supports_sme()) {
-- host_data_clear_flag(HOST_SME_ENABLED);
+- vcpu_clear_flag(vcpu, HOST_SME_ENABLED);
- if (read_sysreg(cpacr_el1) & CPACR_EL1_SMEN_EL0EN)
-- host_data_set_flag(HOST_SME_ENABLED);
+- vcpu_set_flag(vcpu, HOST_SME_ENABLED);
- }
-
/*
@@ arch/arm64/kvm/fpsimd.c: void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu)
- */
- if (has_vhe() && system_supports_sme()) {
- /* Also restore EL0 state seen on entry */
-- if (host_data_test_flag(HOST_SME_ENABLED))
-- sysreg_clear_set(CPACR_EL1, 0, CPACR_EL1_SMEN);
+- if (vcpu_get_flag(vcpu, HOST_SME_ENABLED))
+- sysreg_clear_set(CPACR_EL1, 0, CPACR_ELx_SMEN);
- else
- sysreg_clear_set(CPACR_EL1,
- CPACR_EL1_SMEN_EL0EN,
---
Results of testing on various branches:
| Branch | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.13.y | Success | Success |
