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author | Paolo Bonzini <pbonzini@redhat.com> | 2019-05-16 00:41:43 +0300 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-05-16 00:41:43 +0300 |
commit | dd53f6102c30a774e0db8e55d49017a38060f6f6 (patch) | |
tree | 82ac5f5dcd56225c70516d82a1612439e8d73669 /arch/arm64/kvm/fpsimd.c | |
parent | 59c5c58c5b93285753d5c1de34d2e00039c27bc0 (diff) | |
parent | 9eecfc22e0bfc7a4c8ca007f083f0ae492d6e891 (diff) | |
download | linux-dd53f6102c30a774e0db8e55d49017a38060f6f6.tar.xz |
Merge tag 'kvmarm-for-v5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD
KVM/arm updates for 5.2
- guest SVE support
- guest Pointer Authentication support
- Better discrimination of perf counters between host and guests
Conflicts:
include/uapi/linux/kvm.h
Diffstat (limited to 'arch/arm64/kvm/fpsimd.c')
-rw-r--r-- | arch/arm64/kvm/fpsimd.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/arch/arm64/kvm/fpsimd.c b/arch/arm64/kvm/fpsimd.c index aac7808ce216..6e3c9c8b2df9 100644 --- a/arch/arm64/kvm/fpsimd.c +++ b/arch/arm64/kvm/fpsimd.c @@ -9,6 +9,7 @@ #include <linux/sched.h> #include <linux/thread_info.h> #include <linux/kvm_host.h> +#include <asm/fpsimd.h> #include <asm/kvm_asm.h> #include <asm/kvm_host.h> #include <asm/kvm_mmu.h> @@ -85,9 +86,12 @@ void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu) WARN_ON_ONCE(!irqs_disabled()); if (vcpu->arch.flags & KVM_ARM64_FP_ENABLED) { - fpsimd_bind_state_to_cpu(&vcpu->arch.ctxt.gp_regs.fp_regs); + fpsimd_bind_state_to_cpu(&vcpu->arch.ctxt.gp_regs.fp_regs, + vcpu->arch.sve_state, + vcpu->arch.sve_max_vl); + clear_thread_flag(TIF_FOREIGN_FPSTATE); - clear_thread_flag(TIF_SVE); + update_thread_flag(TIF_SVE, vcpu_has_sve(vcpu)); } } @@ -100,14 +104,21 @@ void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) { unsigned long flags; + bool host_has_sve = system_supports_sve(); + bool guest_has_sve = vcpu_has_sve(vcpu); local_irq_save(flags); if (vcpu->arch.flags & KVM_ARM64_FP_ENABLED) { + u64 *guest_zcr = &vcpu->arch.ctxt.sys_regs[ZCR_EL1]; + /* Clean guest FP state to memory and invalidate cpu view */ fpsimd_save(); fpsimd_flush_cpu_state(); - } else if (system_supports_sve()) { + + if (guest_has_sve) + *guest_zcr = read_sysreg_s(SYS_ZCR_EL12); + } else if (host_has_sve) { /* * The FPSIMD/SVE state in the CPU has not been touched, and we * have SVE (and VHE): CPACR_EL1 (alias CPTR_EL2) has been |