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KVM: arm64: Move SVE state mapping at HYP to finalize-time 

We currently map the SVE state to HYP on detection of a PID change.
Although this matches what we do for FPSIMD, this is pretty pointless
for SVE, as the buffer is per-vcpu and has nothing to do with the
thread that is being run.

Move the mapping of the SVE state to finalize-time, which is where
we allocate the state memory, and thus the most logical place to
do this.

Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2021-10-14 10:24:48 +01:00
parent d58071a8a7
commit bff01a61af
2 changed files with 10 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/arm64/kvm/fpsimd.c
View File

@ -43,17 +43,6 @@ int kvm_arch_vcpu_run_map_fp(struct kvm_vcpu *vcpu)
if (ret)
goto error;
if (vcpu->arch.sve_state) {
void *sve_end;
sve_end = vcpu->arch.sve_state + vcpu_sve_state_size(vcpu);
ret = create_hyp_mappings(vcpu->arch.sve_state, sve_end,
PAGE_HYP);
if (ret)
goto error;
}
vcpu->arch.host_thread_info = kern_hyp_va(ti);
vcpu->arch.host_fpsimd_state = kern_hyp_va(fpsimd);
error:

11
arch/arm64/kvm/reset.c
View File

@ -94,6 +94,8 @@ static int kvm_vcpu_finalize_sve(struct kvm_vcpu *vcpu)
{
void *buf;
unsigned int vl;
size_t reg_sz;
int ret;
vl = vcpu->arch.sve_max_vl;
@ -106,10 +108,17 @@ static int kvm_vcpu_finalize_sve(struct kvm_vcpu *vcpu)
vl > SVE_VL_ARCH_MAX))
return -EIO;
buf = kzalloc(SVE_SIG_REGS_SIZE(sve_vq_from_vl(vl)), GFP_KERNEL_ACCOUNT);
reg_sz = vcpu_sve_state_size(vcpu);
buf = kzalloc(reg_sz, GFP_KERNEL_ACCOUNT);
if (!buf)
return -ENOMEM;
ret = create_hyp_mappings(buf, buf + reg_sz, PAGE_HYP);
if (ret) {
kfree(buf);
return ret;
}
vcpu->arch.sve_state = buf;
vcpu->arch.flags |= KVM_ARM64_VCPU_SVE_FINALIZED;
return 0;