KVM: arm64: Move host SME/SVE tracking flags to host data

The SME/SVE state tracking flags have no business in the vCPU. Move them
to kvm_host_data.

Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20241219224116.3941496-5-oliver.upton@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>

Author: oupton

arch/arm64/include/asm/kvm_host.h

@@ -610,8 +610,10 @@ struct cpu_sve_state {
  * field.
  */
 struct kvm_host_data {
-#define KVM_HOST_DATA_FLAG_HAS_SPE	0
-#define KVM_HOST_DATA_FLAG_HAS_TRBE	1
+#define KVM_HOST_DATA_FLAG_HAS_SPE			0
+#define KVM_HOST_DATA_FLAG_HAS_TRBE			1
+#define KVM_HOST_DATA_FLAG_HOST_SVE_ENABLED		2
+#define KVM_HOST_DATA_FLAG_HOST_SME_ENABLED		3
 	unsigned long flags;
 
 	struct kvm_cpu_context host_ctxt;
@@ -916,22 +918,18 @@ struct kvm_vcpu_arch {
 /* Guest debug is live */
 #define DEBUG_DIRTY		__vcpu_single_flag(iflags, BIT(4))
 
-/* SVE enabled for host EL0 */
-#define HOST_SVE_ENABLED	__vcpu_single_flag(sflags, BIT(0))
-/* SME enabled for EL0 */
-#define HOST_SME_ENABLED	__vcpu_single_flag(sflags, BIT(1))
 /* Physical CPU not in supported_cpus */
-#define ON_UNSUPPORTED_CPU	__vcpu_single_flag(sflags, BIT(2))
+#define ON_UNSUPPORTED_CPU	__vcpu_single_flag(sflags, BIT(0))
 /* WFIT instruction trapped */
-#define IN_WFIT			__vcpu_single_flag(sflags, BIT(3))
+#define IN_WFIT			__vcpu_single_flag(sflags, BIT(1))
 /* vcpu system registers loaded on physical CPU */
-#define SYSREGS_ON_CPU		__vcpu_single_flag(sflags, BIT(4))
+#define SYSREGS_ON_CPU		__vcpu_single_flag(sflags, BIT(2))
 /* Software step state is Active-pending */
-#define DBG_SS_ACTIVE_PENDING	__vcpu_single_flag(sflags, BIT(5))
+#define DBG_SS_ACTIVE_PENDING	__vcpu_single_flag(sflags, BIT(3))
 /* PMUSERENR for the guest EL0 is on physical CPU */
-#define PMUSERENR_ON_CPU	__vcpu_single_flag(sflags, BIT(6))
+#define PMUSERENR_ON_CPU	__vcpu_single_flag(sflags, BIT(4))
 /* WFI instruction trapped */
-#define IN_WFI			__vcpu_single_flag(sflags, BIT(7))
+#define IN_WFI			__vcpu_single_flag(sflags, BIT(5))
 
 
 /* Pointer to the vcpu's SVE FFR for sve_{save,load}_state() */

arch/arm64/kvm/fpsimd.c

@@ -65,14 +65,14 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
 	*host_data_ptr(fpsimd_state) = kern_hyp_va(&current->thread.uw.fpsimd_state);
 	*host_data_ptr(fpmr_ptr) = kern_hyp_va(&current->thread.uw.fpmr);
 
-	vcpu_clear_flag(vcpu, HOST_SVE_ENABLED);
+	host_data_clear_flag(HOST_SVE_ENABLED);
 	if (read_sysreg(cpacr_el1) & CPACR_EL1_ZEN_EL0EN)
-		vcpu_set_flag(vcpu, HOST_SVE_ENABLED);
+		host_data_set_flag(HOST_SVE_ENABLED);
 
 	if (system_supports_sme()) {
-		vcpu_clear_flag(vcpu, HOST_SME_ENABLED);
+		host_data_clear_flag(HOST_SME_ENABLED);
 		if (read_sysreg(cpacr_el1) & CPACR_EL1_SMEN_EL0EN)
-			vcpu_set_flag(vcpu, HOST_SME_ENABLED);
+			host_data_set_flag(HOST_SME_ENABLED);
 
 		/*
 		 * If PSTATE.SM is enabled then save any pending FP
@@ -168,7 +168,7 @@ void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu)
 	 */
 	if (has_vhe() && system_supports_sme()) {
 		/* Also restore EL0 state seen on entry */
-		if (vcpu_get_flag(vcpu, HOST_SME_ENABLED))
+		if (host_data_test_flag(HOST_SME_ENABLED))
 			sysreg_clear_set(CPACR_EL1, 0, CPACR_ELx_SMEN);
 		else
 			sysreg_clear_set(CPACR_EL1,
@@ -227,7 +227,7 @@ void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu)
 		 * for EL0.  To avoid spurious traps, restore the trap state
 		 * seen by kvm_arch_vcpu_load_fp():
 		 */
-		if (vcpu_get_flag(vcpu, HOST_SVE_ENABLED))
+		if (host_data_test_flag(HOST_SVE_ENABLED))
 			sysreg_clear_set(CPACR_EL1, 0, CPACR_EL1_ZEN_EL0EN);
 		else
 			sysreg_clear_set(CPACR_EL1, CPACR_EL1_ZEN_EL0EN, 0);