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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2015 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*/
#include <hyp/debug-sr.h>
#include <linux/compiler.h>
#include <linux/kvm_host.h>
#include <asm/debug-monitors.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_hyp.h>
#include <asm/kvm_mmu.h>
static void __debug_save_spe(u64 *pmscr_el1)
{
u64 reg;
/* Clear pmscr in case of early return */
*pmscr_el1 = 0;
/* SPE present on this CPU? */
if (!cpuid_feature_extract_unsigned_field(read_sysreg(id_aa64dfr0_el1),
ID_AA64DFR0_PMSVER_SHIFT))
return;
/* Yes; is it owned by EL3? */
reg = read_sysreg_s(SYS_PMBIDR_EL1);
if (reg & BIT(SYS_PMBIDR_EL1_P_SHIFT))
return;
/* No; is the host actually using the thing? */
reg = read_sysreg_s(SYS_PMBLIMITR_EL1);
if (!(reg & BIT(SYS_PMBLIMITR_EL1_E_SHIFT)))
return;
/* Yes; save the control register and disable data generation */
*pmscr_el1 = read_sysreg_s(SYS_PMSCR_EL1);
write_sysreg_s(0, SYS_PMSCR_EL1);
isb();
/* Now drain all buffered data to memory */
psb_csync();
dsb(nsh);
}
static void __debug_restore_spe(u64 pmscr_el1)
{
if (!pmscr_el1)
return;
/* The host page table is installed, but not yet synchronised */
isb();
/* Re-enable data generation */
write_sysreg_s(pmscr_el1, SYS_PMSCR_EL1);
}
void __debug_save_host_buffers_nvhe(struct kvm_vcpu *vcpu)
{
/* Disable and flush SPE data generation */
__debug_save_spe(&vcpu->arch.host_debug_state.pmscr_el1);
}
void __debug_switch_to_guest(struct kvm_vcpu *vcpu)
{
__debug_switch_to_guest_common(vcpu);
}
void __debug_restore_host_buffers_nvhe(struct kvm_vcpu *vcpu)
{
__debug_restore_spe(vcpu->arch.host_debug_state.pmscr_el1);
}
void __debug_switch_to_host(struct kvm_vcpu *vcpu)
{
__debug_switch_to_host_common(vcpu);
}
u32 __kvm_get_mdcr_el2(void)
{
return read_sysreg(mdcr_el2);
}
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