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KVM: arm64: Exclude host_fpsimd_state pointer from kvm_vcpu_arch

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As the name of the field indicates, host_fpsimd_state is strictly
a host piece of data, and we reset this pointer on each PID change.

So let's move it where it belongs, and set it at load-time. Although
this is slightly more often, it is a well defined life-cycle which
matches other pieces of data.

Reviewed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2024-03-01 12:06:44 +00:00
parent 4bacd72370
commit 51e09b5572
4 changed files with 3 additions and 5 deletions
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2
arch/arm64/include/asm/kvm_host.h
View File

@ -543,6 +543,7 @@ struct kvm_cpu_context {
*/
struct kvm_host_data {
struct kvm_cpu_context host_ctxt;
struct user_fpsimd_state *fpsimd_state; /* hyp VA */
/*
* host_debug_state contains the host registers which are
@ -662,7 +663,6 @@ struct kvm_vcpu_arch {
struct kvm_guest_debug_arch vcpu_debug_state;
struct kvm_guest_debug_arch external_debug_state;
struct user_fpsimd_state *host_fpsimd_state; /* hyp VA */
struct task_struct *parent_task;
/* VGIC state */

3
arch/arm64/kvm/fpsimd.c
View File

@ -49,8 +49,6 @@ int kvm_arch_vcpu_run_map_fp(struct kvm_vcpu *vcpu)
if (ret)
return ret;
vcpu->arch.host_fpsimd_state = kern_hyp_va(fpsimd);
/*
* We need to keep current's task_struct pinned until its data has been
* unshared with the hypervisor to make sure it is not re-used by the
@ -87,6 +85,7 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
* FP_STATE_FREE if the flag set.
*/
vcpu->arch.fp_state = FP_STATE_HOST_OWNED;
*host_data_ptr(fpsimd_state) = kern_hyp_va(&current->thread.uw.fpsimd_state);
vcpu_clear_flag(vcpu, HOST_SVE_ENABLED);
if (read_sysreg(cpacr_el1) & CPACR_EL1_ZEN_EL0EN)

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

@ -377,7 +377,7 @@ static bool kvm_hyp_handle_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code)
/* Write out the host state if it's in the registers */
if (vcpu->arch.fp_state == FP_STATE_HOST_OWNED)
__fpsimd_save_state(vcpu->arch.host_fpsimd_state);
__fpsimd_save_state(*host_data_ptr(fpsimd_state));
/* Restore the guest state */
if (sve_guest)

1
arch/arm64/kvm/hyp/nvhe/hyp-main.c
View File

@ -42,7 +42,6 @@ static void flush_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu)
hyp_vcpu->vcpu.arch.fp_state = host_vcpu->arch.fp_state;
hyp_vcpu->vcpu.arch.debug_ptr = kern_hyp_va(host_vcpu->arch.debug_ptr);
hyp_vcpu->vcpu.arch.host_fpsimd_state = host_vcpu->arch.host_fpsimd_state;
hyp_vcpu->vcpu.arch.vsesr_el2 = host_vcpu->arch.vsesr_el2;