200 lines
5.8 KiB
C
200 lines
5.8 KiB
C
/*
|
|
* Copyright (C) 2015 - ARM Ltd
|
|
* Author: Marc Zyngier <marc.zyngier@arm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/kvm_host.h>
|
|
|
|
#include <asm/debug-monitors.h>
|
|
#include <asm/kvm_asm.h>
|
|
#include <asm/kvm_hyp.h>
|
|
|
|
#define read_debug(r,n) read_sysreg(r##n##_el1)
|
|
#define write_debug(v,r,n) write_sysreg(v, r##n##_el1)
|
|
|
|
#define save_debug(ptr,reg,nr) \
|
|
switch (nr) { \
|
|
case 15: ptr[15] = read_debug(reg, 15); \
|
|
case 14: ptr[14] = read_debug(reg, 14); \
|
|
case 13: ptr[13] = read_debug(reg, 13); \
|
|
case 12: ptr[12] = read_debug(reg, 12); \
|
|
case 11: ptr[11] = read_debug(reg, 11); \
|
|
case 10: ptr[10] = read_debug(reg, 10); \
|
|
case 9: ptr[9] = read_debug(reg, 9); \
|
|
case 8: ptr[8] = read_debug(reg, 8); \
|
|
case 7: ptr[7] = read_debug(reg, 7); \
|
|
case 6: ptr[6] = read_debug(reg, 6); \
|
|
case 5: ptr[5] = read_debug(reg, 5); \
|
|
case 4: ptr[4] = read_debug(reg, 4); \
|
|
case 3: ptr[3] = read_debug(reg, 3); \
|
|
case 2: ptr[2] = read_debug(reg, 2); \
|
|
case 1: ptr[1] = read_debug(reg, 1); \
|
|
default: ptr[0] = read_debug(reg, 0); \
|
|
}
|
|
|
|
#define restore_debug(ptr,reg,nr) \
|
|
switch (nr) { \
|
|
case 15: write_debug(ptr[15], reg, 15); \
|
|
case 14: write_debug(ptr[14], reg, 14); \
|
|
case 13: write_debug(ptr[13], reg, 13); \
|
|
case 12: write_debug(ptr[12], reg, 12); \
|
|
case 11: write_debug(ptr[11], reg, 11); \
|
|
case 10: write_debug(ptr[10], reg, 10); \
|
|
case 9: write_debug(ptr[9], reg, 9); \
|
|
case 8: write_debug(ptr[8], reg, 8); \
|
|
case 7: write_debug(ptr[7], reg, 7); \
|
|
case 6: write_debug(ptr[6], reg, 6); \
|
|
case 5: write_debug(ptr[5], reg, 5); \
|
|
case 4: write_debug(ptr[4], reg, 4); \
|
|
case 3: write_debug(ptr[3], reg, 3); \
|
|
case 2: write_debug(ptr[2], reg, 2); \
|
|
case 1: write_debug(ptr[1], reg, 1); \
|
|
default: write_debug(ptr[0], reg, 0); \
|
|
}
|
|
|
|
#define PMSCR_EL1 sys_reg(3, 0, 9, 9, 0)
|
|
|
|
#define PMBLIMITR_EL1 sys_reg(3, 0, 9, 10, 0)
|
|
#define PMBLIMITR_EL1_E BIT(0)
|
|
|
|
#define PMBIDR_EL1 sys_reg(3, 0, 9, 10, 7)
|
|
#define PMBIDR_EL1_P BIT(4)
|
|
|
|
#define psb_csync() asm volatile("hint #17")
|
|
|
|
static void __hyp_text __debug_save_spe_vhe(u64 *pmscr_el1)
|
|
{
|
|
/* The vcpu can run. but it can't hide. */
|
|
}
|
|
|
|
static void __hyp_text __debug_save_spe_nvhe(u64 *pmscr_el1)
|
|
{
|
|
u64 reg;
|
|
|
|
/* 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(PMBIDR_EL1);
|
|
if (reg & PMBIDR_EL1_P)
|
|
return;
|
|
|
|
/* No; is the host actually using the thing? */
|
|
reg = read_sysreg_s(PMBLIMITR_EL1);
|
|
if (!(reg & PMBLIMITR_EL1_E))
|
|
return;
|
|
|
|
/* Yes; save the control register and disable data generation */
|
|
*pmscr_el1 = read_sysreg_s(PMSCR_EL1);
|
|
write_sysreg_s(0, PMSCR_EL1);
|
|
isb();
|
|
|
|
/* Now drain all buffered data to memory */
|
|
psb_csync();
|
|
dsb(nsh);
|
|
}
|
|
|
|
static hyp_alternate_select(__debug_save_spe,
|
|
__debug_save_spe_nvhe, __debug_save_spe_vhe,
|
|
ARM64_HAS_VIRT_HOST_EXTN);
|
|
|
|
static void __hyp_text __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, PMSCR_EL1);
|
|
}
|
|
|
|
void __hyp_text __debug_save_state(struct kvm_vcpu *vcpu,
|
|
struct kvm_guest_debug_arch *dbg,
|
|
struct kvm_cpu_context *ctxt)
|
|
{
|
|
u64 aa64dfr0;
|
|
int brps, wrps;
|
|
|
|
if (!(vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY))
|
|
return;
|
|
|
|
aa64dfr0 = read_sysreg(id_aa64dfr0_el1);
|
|
brps = (aa64dfr0 >> 12) & 0xf;
|
|
wrps = (aa64dfr0 >> 20) & 0xf;
|
|
|
|
save_debug(dbg->dbg_bcr, dbgbcr, brps);
|
|
save_debug(dbg->dbg_bvr, dbgbvr, brps);
|
|
save_debug(dbg->dbg_wcr, dbgwcr, wrps);
|
|
save_debug(dbg->dbg_wvr, dbgwvr, wrps);
|
|
|
|
ctxt->sys_regs[MDCCINT_EL1] = read_sysreg(mdccint_el1);
|
|
}
|
|
|
|
void __hyp_text __debug_restore_state(struct kvm_vcpu *vcpu,
|
|
struct kvm_guest_debug_arch *dbg,
|
|
struct kvm_cpu_context *ctxt)
|
|
{
|
|
u64 aa64dfr0;
|
|
int brps, wrps;
|
|
|
|
if (!(vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY))
|
|
return;
|
|
|
|
aa64dfr0 = read_sysreg(id_aa64dfr0_el1);
|
|
|
|
brps = (aa64dfr0 >> 12) & 0xf;
|
|
wrps = (aa64dfr0 >> 20) & 0xf;
|
|
|
|
restore_debug(dbg->dbg_bcr, dbgbcr, brps);
|
|
restore_debug(dbg->dbg_bvr, dbgbvr, brps);
|
|
restore_debug(dbg->dbg_wcr, dbgwcr, wrps);
|
|
restore_debug(dbg->dbg_wvr, dbgwvr, wrps);
|
|
|
|
write_sysreg(ctxt->sys_regs[MDCCINT_EL1], mdccint_el1);
|
|
}
|
|
|
|
void __hyp_text __debug_cond_save_host_state(struct kvm_vcpu *vcpu)
|
|
{
|
|
/* If any of KDE, MDE or KVM_ARM64_DEBUG_DIRTY is set, perform
|
|
* a full save/restore cycle. */
|
|
if ((vcpu->arch.ctxt.sys_regs[MDSCR_EL1] & DBG_MDSCR_KDE) ||
|
|
(vcpu->arch.ctxt.sys_regs[MDSCR_EL1] & DBG_MDSCR_MDE))
|
|
vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY;
|
|
|
|
__debug_save_state(vcpu, &vcpu->arch.host_debug_state.regs,
|
|
kern_hyp_va(vcpu->arch.host_cpu_context));
|
|
__debug_save_spe()(&vcpu->arch.host_debug_state.pmscr_el1);
|
|
}
|
|
|
|
void __hyp_text __debug_cond_restore_host_state(struct kvm_vcpu *vcpu)
|
|
{
|
|
__debug_restore_spe(vcpu->arch.host_debug_state.pmscr_el1);
|
|
__debug_restore_state(vcpu, &vcpu->arch.host_debug_state.regs,
|
|
kern_hyp_va(vcpu->arch.host_cpu_context));
|
|
|
|
if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
|
|
vcpu->arch.debug_flags &= ~KVM_ARM64_DEBUG_DIRTY;
|
|
}
|
|
|
|
u32 __hyp_text __kvm_get_mdcr_el2(void)
|
|
{
|
|
return read_sysreg(mdcr_el2);
|
|
}
|