diff options
| author | Atish Patra <atish.patra@wdc.com> | 2021-09-27 13:40:12 +0200 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2021-10-04 12:38:23 +0200 |
| commit | 5de52d4a23ad3346c3cb24aae728ef6642d1a92e (patch) | |
| tree | 2e5e161bb93e0cecc740a8029a4d186ddb71ad27 /arch/riscv/include | |
| parent | RISC-V: KVM: Add timer functionality (diff) | |
| download | linux-5de52d4a23ad3346c3cb24aae728ef6642d1a92e.tar.xz linux-5de52d4a23ad3346c3cb24aae728ef6642d1a92e.zip | |
RISC-V: KVM: FP lazy save/restore
This patch adds floating point (F and D extension) context save/restore
for guest VCPUs. The FP context is saved and restored lazily only when
kernel enter/exits the in-kernel run loop and not during the KVM world
switch. This way FP save/restore has minimal impact on KVM performance.
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Alexander Graf <graf@amazon.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/include')
| -rw-r--r-- | arch/riscv/include/asm/kvm_host.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h index c22d3f6519fa..be159686da46 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -125,6 +125,7 @@ struct kvm_cpu_context { unsigned long sepc; unsigned long sstatus; unsigned long hstatus; + union __riscv_fp_state fp; }; struct kvm_vcpu_csr { @@ -239,6 +240,10 @@ int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, struct kvm_cpu_trap *trap); void __kvm_riscv_switch_to(struct kvm_vcpu_arch *vcpu_arch); +void __kvm_riscv_fp_f_save(struct kvm_cpu_context *context); +void __kvm_riscv_fp_f_restore(struct kvm_cpu_context *context); +void __kvm_riscv_fp_d_save(struct kvm_cpu_context *context); +void __kvm_riscv_fp_d_restore(struct kvm_cpu_context *context); int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq); int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq); |