KVM: arm64: Exclude FP ownership from kvm_vcpu_arch

In retrospect, it is fairly obvious that the FP state ownership
is only meaningful for a given CPU, and that locating this
information in the vcpu was just a mistake.

Move the ownership tracking into the host data structure, and
rename it from fp_state to fp_owner, which is a better description
(name suggested by Mark Brown).

Reviewed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>

Author: Marc Zyngier

arch/arm64/include/asm/kvm_emulate.h

@@ -588,15 +588,15 @@ static __always_inline u64 kvm_get_reset_cptr_el2(struct kvm_vcpu *vcpu)
 		val = (CPACR_EL1_FPEN_EL0EN | CPACR_EL1_FPEN_EL1EN);
 
 		if (!vcpu_has_sve(vcpu) ||
-		    (vcpu->arch.fp_state != FP_STATE_GUEST_OWNED))
+		    (*host_data_ptr(fp_owner) != FP_STATE_GUEST_OWNED))
 			val |= CPACR_EL1_ZEN_EL1EN | CPACR_EL1_ZEN_EL0EN;
 		if (cpus_have_final_cap(ARM64_SME))
 			val |= CPACR_EL1_SMEN_EL1EN | CPACR_EL1_SMEN_EL0EN;
 	} else {
 		val = CPTR_NVHE_EL2_RES1;
 
 		if (vcpu_has_sve(vcpu) &&
-		    (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED))
+		    (*host_data_ptr(fp_owner) == FP_STATE_GUEST_OWNED))
 			val |= CPTR_EL2_TZ;
 		if (cpus_have_final_cap(ARM64_SME))
 			val &= ~CPTR_EL2_TSM;

arch/arm64/include/asm/kvm_host.h

@@ -545,6 +545,13 @@ struct kvm_host_data {
 	struct kvm_cpu_context host_ctxt;
 	struct user_fpsimd_state *fpsimd_state;	/* hyp VA */
 
+	/* Ownership of the FP regs */
+	enum {
+		FP_STATE_FREE,
+		FP_STATE_HOST_OWNED,
+		FP_STATE_GUEST_OWNED,
+	} fp_owner;
+
 	/*
 	 * host_debug_state contains the host registers which are
 	 * saved and restored during world switches.
@@ -622,13 +629,6 @@ struct kvm_vcpu_arch {
 	/* Exception Information */
 	struct kvm_vcpu_fault_info fault;
 
-	/* Ownership of the FP regs */
-	enum {
-		FP_STATE_FREE,
-		FP_STATE_HOST_OWNED,
-		FP_STATE_GUEST_OWNED,
-	} fp_state;
-
 	/* Configuration flags, set once and for all before the vcpu can run */
 	u8 cflags;
 

arch/arm64/kvm/arm.c

@@ -378,12 +378,6 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 
 	vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO;
 
-	/*
-	 * Default value for the FP state, will be overloaded at load
-	 * time if we support FP (pretty likely)
-	 */
-	vcpu->arch.fp_state = FP_STATE_FREE;
-
 	/* Set up the timer */
 	kvm_timer_vcpu_init(vcpu);
 

arch/arm64/kvm/fpsimd.c

@@ -84,7 +84,7 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
 	 * guest in kvm_arch_vcpu_ctxflush_fp() and override this to
 	 * FP_STATE_FREE if the flag set.
 	 */
-	vcpu->arch.fp_state = FP_STATE_HOST_OWNED;
+	*host_data_ptr(fp_owner) = FP_STATE_HOST_OWNED;
 	*host_data_ptr(fpsimd_state) = kern_hyp_va(&current->thread.uw.fpsimd_state);
 
 	vcpu_clear_flag(vcpu, HOST_SVE_ENABLED);
@@ -109,7 +109,7 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
 		 * been saved, this is very unlikely to happen.
 		 */
 		if (read_sysreg_s(SYS_SVCR) & (SVCR_SM_MASK | SVCR_ZA_MASK)) {
-			vcpu->arch.fp_state = FP_STATE_FREE;
+			*host_data_ptr(fp_owner) = FP_STATE_FREE;
 			fpsimd_save_and_flush_cpu_state();
 		}
 	}
@@ -125,7 +125,7 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
 void kvm_arch_vcpu_ctxflush_fp(struct kvm_vcpu *vcpu)
 {
 	if (test_thread_flag(TIF_FOREIGN_FPSTATE))
-		vcpu->arch.fp_state = FP_STATE_FREE;
+		*host_data_ptr(fp_owner) = FP_STATE_FREE;
 }
 
 /*
@@ -141,7 +141,7 @@ void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu)
 
 	WARN_ON_ONCE(!irqs_disabled());
 
-	if (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED) {
+	if (*host_data_ptr(fp_owner) == FP_STATE_GUEST_OWNED) {
 
 		/*
 		 * Currently we do not support SME guests so SVCR is
@@ -195,7 +195,7 @@ void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu)
 		isb();
 	}
 
-	if (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED) {
+	if (*host_data_ptr(fp_owner) == FP_STATE_GUEST_OWNED) {
 		if (vcpu_has_sve(vcpu)) {
 			__vcpu_sys_reg(vcpu, ZCR_EL1) = read_sysreg_el1(SYS_ZCR);
 

arch/arm64/kvm/hyp/include/hyp/switch.h

@@ -42,7 +42,7 @@ extern struct kvm_exception_table_entry __stop___kvm_ex_table;
 /* Check whether the FP regs are owned by the guest */
 static inline bool guest_owns_fp_regs(struct kvm_vcpu *vcpu)
 {
-	return vcpu->arch.fp_state == FP_STATE_GUEST_OWNED;
+	return *host_data_ptr(fp_owner) == FP_STATE_GUEST_OWNED;
 }
 
 /* Save the 32-bit only FPSIMD system register state */
@@ -376,7 +376,7 @@ static bool kvm_hyp_handle_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code)
 	isb();
 
 	/* Write out the host state if it's in the registers */
-	if (vcpu->arch.fp_state == FP_STATE_HOST_OWNED)
+	if (*host_data_ptr(fp_owner) == FP_STATE_HOST_OWNED)
 		__fpsimd_save_state(*host_data_ptr(fpsimd_state));
 
 	/* Restore the guest state */
@@ -389,7 +389,7 @@ static bool kvm_hyp_handle_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code)
 	if (!(read_sysreg(hcr_el2) & HCR_RW))
 		write_sysreg(__vcpu_sys_reg(vcpu, FPEXC32_EL2), fpexc32_el2);
 
-	vcpu->arch.fp_state = FP_STATE_GUEST_OWNED;
+	*host_data_ptr(fp_owner) = FP_STATE_GUEST_OWNED;
 
 	return true;
 }

arch/arm64/kvm/hyp/nvhe/hyp-main.c

@@ -39,7 +39,6 @@ static void flush_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu)
 	hyp_vcpu->vcpu.arch.cptr_el2	= host_vcpu->arch.cptr_el2;
 
 	hyp_vcpu->vcpu.arch.iflags	= host_vcpu->arch.iflags;
-	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);
 
@@ -63,7 +62,6 @@ static void sync_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu)
 	host_vcpu->arch.fault		= hyp_vcpu->vcpu.arch.fault;
 
 	host_vcpu->arch.iflags		= hyp_vcpu->vcpu.arch.iflags;
-	host_vcpu->arch.fp_state	= hyp_vcpu->vcpu.arch.fp_state;
 
 	host_cpu_if->vgic_hcr		= hyp_cpu_if->vgic_hcr;
 	for (i = 0; i < hyp_cpu_if->used_lrs; ++i)

arch/arm64/kvm/hyp/nvhe/switch.c

@@ -337,7 +337,7 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
 
 	__sysreg_restore_state_nvhe(host_ctxt);
 
-	if (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED)
+	if (*host_data_ptr(fp_owner) == FP_STATE_GUEST_OWNED)
 		__fpsimd_save_fpexc32(vcpu);
 
 	__debug_switch_to_host(vcpu);

arch/arm64/kvm/hyp/vhe/switch.c

@@ -258,7 +258,7 @@ static int __kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
 
 	sysreg_restore_host_state_vhe(host_ctxt);
 
-	if (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED)
+	if (*host_data_ptr(fp_owner) == FP_STATE_GUEST_OWNED)
 		__fpsimd_save_fpexc32(vcpu);
 
 	__debug_switch_to_host(vcpu);