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Revert "FROMGIT: KVM: arm64: Introduce flag shadowing TIF_FOREIGN_FPSTATE"

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This reverts commit 71d0d497f2.

Bug: 233587962
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: I0e86bc4960b61e2bd80311f0acdaf8221a5f7059
This commit is contained in:
Will Deacon
2022-07-07 15:56:20 +01:00
parent 34bc0dc4bc
commit 3604ba34a5
4 changed files with 1 additions and 12 deletions
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2
arch/arm64/include/asm/kvm_host.h
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@@ -441,7 +441,6 @@ struct kvm_vcpu_arch {
#define KVM_ARM64_DEBUG_STATE_SAVE_SPE (1 << 12) /* Save SPE context if active */
#define KVM_ARM64_DEBUG_STATE_SAVE_TRBE (1 << 13) /* Save TRBE context if active */
#define KVM_ARM64_FP_FOREIGN_FPSTATE (1 << 14)
#define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | \
KVM_GUESTDBG_USE_SW_BP | \
@@ -742,7 +741,6 @@ long kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm,
/* Guest/host FPSIMD coordination helpers */
int kvm_arch_vcpu_run_map_fp(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_ctxflush_fp(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu);

1
arch/arm64/kvm/arm.c
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@@ -875,7 +875,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
}
kvm_arm_setup_debug(vcpu);
kvm_arch_vcpu_ctxflush_fp(vcpu);
/**************************************************************
* Enter the guest

8
arch/arm64/kvm/fpsimd.c
View File

@@ -79,14 +79,6 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
vcpu->arch.flags |= KVM_ARM64_HOST_SVE_ENABLED;
}
void kvm_arch_vcpu_ctxflush_fp(struct kvm_vcpu *vcpu)
{
if (test_thread_flag(TIF_FOREIGN_FPSTATE))
vcpu->arch.flags |= KVM_ARM64_FP_FOREIGN_FPSTATE;
else
vcpu->arch.flags &= ~KVM_ARM64_FP_FOREIGN_FPSTATE;
}
/*
* If the guest FPSIMD state was loaded, update the host's context
* tracking data mark the CPU FPSIMD regs as dirty and belonging to vcpu

2
arch/arm64/kvm/hyp/include/hyp/switch.h
View File

@@ -45,7 +45,7 @@ static inline bool update_fp_enabled(struct kvm_vcpu *vcpu)
* trap the accesses.
*/
if (!system_supports_fpsimd() ||
vcpu->arch.flags & KVM_ARM64_FP_FOREIGN_FPSTATE)
vcpu->arch.host_thread_info->flags & _TIF_FOREIGN_FPSTATE)
vcpu->arch.flags &= ~(KVM_ARM64_FP_ENABLED |
KVM_ARM64_FP_HOST);