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fa89d31c53
In struct vcpu_arch, the debug_flags field is used to store
debug-related flags about the vcpu state.
Since we are about to add some more flags related to FPSIMD and
SVE, it makes sense to add them to the existing flags field rather
than adding new fields. Since there is only one debug_flags flag
defined so far, there is plenty of free space for expansion.
In preparation for adding more flags, this patch renames the
debug_flags field to simply "flags", and updates comments
appropriately.
The flag definitions are also moved to <asm/kvm_host.h>, since
their presence in <asm/kvm_asm.h> was for purely historical
reasons: these definitions are not used from asm any more, and not
very likely to be as more Hyp asm is migrated to C.
KVM_ARM64_DEBUG_DIRTY_SHIFT has not been used since commit
1ea66d27e7 ("arm64: KVM: Move away from the assembly version of
the world switch"), so this patch gets rid of that too.
No functional change.
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
[maz: fixed minor conflict]
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
206 lines
5.9 KiB
C
206 lines
5.9 KiB
C
/*
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* Copyright (C) 2015 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/compiler.h>
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#include <linux/kvm_host.h>
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#include <asm/debug-monitors.h>
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#include <asm/kvm_asm.h>
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#include <asm/kvm_hyp.h>
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#include <asm/kvm_mmu.h>
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#define read_debug(r,n) read_sysreg(r##n##_el1)
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#define write_debug(v,r,n) write_sysreg(v, r##n##_el1)
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#define save_debug(ptr,reg,nr) \
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switch (nr) { \
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case 15: ptr[15] = read_debug(reg, 15); \
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case 14: ptr[14] = read_debug(reg, 14); \
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case 13: ptr[13] = read_debug(reg, 13); \
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case 12: ptr[12] = read_debug(reg, 12); \
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case 11: ptr[11] = read_debug(reg, 11); \
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case 10: ptr[10] = read_debug(reg, 10); \
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case 9: ptr[9] = read_debug(reg, 9); \
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case 8: ptr[8] = read_debug(reg, 8); \
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case 7: ptr[7] = read_debug(reg, 7); \
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case 6: ptr[6] = read_debug(reg, 6); \
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case 5: ptr[5] = read_debug(reg, 5); \
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case 4: ptr[4] = read_debug(reg, 4); \
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case 3: ptr[3] = read_debug(reg, 3); \
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case 2: ptr[2] = read_debug(reg, 2); \
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case 1: ptr[1] = read_debug(reg, 1); \
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default: ptr[0] = read_debug(reg, 0); \
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}
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#define restore_debug(ptr,reg,nr) \
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switch (nr) { \
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case 15: write_debug(ptr[15], reg, 15); \
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case 14: write_debug(ptr[14], reg, 14); \
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case 13: write_debug(ptr[13], reg, 13); \
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case 12: write_debug(ptr[12], reg, 12); \
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case 11: write_debug(ptr[11], reg, 11); \
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case 10: write_debug(ptr[10], reg, 10); \
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case 9: write_debug(ptr[9], reg, 9); \
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case 8: write_debug(ptr[8], reg, 8); \
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case 7: write_debug(ptr[7], reg, 7); \
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case 6: write_debug(ptr[6], reg, 6); \
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case 5: write_debug(ptr[5], reg, 5); \
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case 4: write_debug(ptr[4], reg, 4); \
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case 3: write_debug(ptr[3], reg, 3); \
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case 2: write_debug(ptr[2], reg, 2); \
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case 1: write_debug(ptr[1], reg, 1); \
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default: write_debug(ptr[0], reg, 0); \
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}
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static void __hyp_text __debug_save_spe_nvhe(u64 *pmscr_el1)
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{
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u64 reg;
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/* Clear pmscr in case of early return */
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*pmscr_el1 = 0;
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/* SPE present on this CPU? */
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if (!cpuid_feature_extract_unsigned_field(read_sysreg(id_aa64dfr0_el1),
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ID_AA64DFR0_PMSVER_SHIFT))
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return;
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/* Yes; is it owned by EL3? */
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reg = read_sysreg_s(SYS_PMBIDR_EL1);
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if (reg & BIT(SYS_PMBIDR_EL1_P_SHIFT))
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return;
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/* No; is the host actually using the thing? */
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reg = read_sysreg_s(SYS_PMBLIMITR_EL1);
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if (!(reg & BIT(SYS_PMBLIMITR_EL1_E_SHIFT)))
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return;
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/* Yes; save the control register and disable data generation */
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*pmscr_el1 = read_sysreg_s(SYS_PMSCR_EL1);
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write_sysreg_s(0, SYS_PMSCR_EL1);
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isb();
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/* Now drain all buffered data to memory */
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psb_csync();
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dsb(nsh);
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}
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static void __hyp_text __debug_restore_spe_nvhe(u64 pmscr_el1)
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{
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if (!pmscr_el1)
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return;
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/* The host page table is installed, but not yet synchronised */
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isb();
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/* Re-enable data generation */
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write_sysreg_s(pmscr_el1, SYS_PMSCR_EL1);
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}
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static void __hyp_text __debug_save_state(struct kvm_vcpu *vcpu,
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struct kvm_guest_debug_arch *dbg,
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struct kvm_cpu_context *ctxt)
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{
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u64 aa64dfr0;
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int brps, wrps;
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aa64dfr0 = read_sysreg(id_aa64dfr0_el1);
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brps = (aa64dfr0 >> 12) & 0xf;
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wrps = (aa64dfr0 >> 20) & 0xf;
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save_debug(dbg->dbg_bcr, dbgbcr, brps);
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save_debug(dbg->dbg_bvr, dbgbvr, brps);
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save_debug(dbg->dbg_wcr, dbgwcr, wrps);
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save_debug(dbg->dbg_wvr, dbgwvr, wrps);
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ctxt->sys_regs[MDCCINT_EL1] = read_sysreg(mdccint_el1);
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}
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static void __hyp_text __debug_restore_state(struct kvm_vcpu *vcpu,
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struct kvm_guest_debug_arch *dbg,
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struct kvm_cpu_context *ctxt)
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{
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u64 aa64dfr0;
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int brps, wrps;
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aa64dfr0 = read_sysreg(id_aa64dfr0_el1);
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brps = (aa64dfr0 >> 12) & 0xf;
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wrps = (aa64dfr0 >> 20) & 0xf;
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restore_debug(dbg->dbg_bcr, dbgbcr, brps);
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restore_debug(dbg->dbg_bvr, dbgbvr, brps);
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restore_debug(dbg->dbg_wcr, dbgwcr, wrps);
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restore_debug(dbg->dbg_wvr, dbgwvr, wrps);
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write_sysreg(ctxt->sys_regs[MDCCINT_EL1], mdccint_el1);
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}
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void __hyp_text __debug_switch_to_guest(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpu_context *host_ctxt;
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struct kvm_cpu_context *guest_ctxt;
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struct kvm_guest_debug_arch *host_dbg;
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struct kvm_guest_debug_arch *guest_dbg;
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/*
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* Non-VHE: Disable and flush SPE data generation
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* VHE: The vcpu can run, but it can't hide.
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*/
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if (!has_vhe())
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__debug_save_spe_nvhe(&vcpu->arch.host_debug_state.pmscr_el1);
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if (!(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY))
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return;
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host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context);
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guest_ctxt = &vcpu->arch.ctxt;
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host_dbg = &vcpu->arch.host_debug_state.regs;
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guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr);
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__debug_save_state(vcpu, host_dbg, host_ctxt);
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__debug_restore_state(vcpu, guest_dbg, guest_ctxt);
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}
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void __hyp_text __debug_switch_to_host(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpu_context *host_ctxt;
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struct kvm_cpu_context *guest_ctxt;
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struct kvm_guest_debug_arch *host_dbg;
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struct kvm_guest_debug_arch *guest_dbg;
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if (!has_vhe())
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__debug_restore_spe_nvhe(vcpu->arch.host_debug_state.pmscr_el1);
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if (!(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY))
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return;
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host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context);
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guest_ctxt = &vcpu->arch.ctxt;
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host_dbg = &vcpu->arch.host_debug_state.regs;
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guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr);
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__debug_save_state(vcpu, guest_dbg, guest_ctxt);
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__debug_restore_state(vcpu, host_dbg, host_ctxt);
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vcpu->arch.flags &= ~KVM_ARM64_DEBUG_DIRTY;
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}
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u32 __hyp_text __kvm_get_mdcr_el2(void)
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{
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return read_sysreg(mdcr_el2);
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}
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