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KVM: arm64: Add debugfs file dumping computed RESx values

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Computing RESx values is hard. Verifying that they are correct is
harder. Add a debugfs file called "resx" that will dump all the RESx
values for a given VM.

I found it useful, maybe you will too.

Co-developed-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-21-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2026-02-02 18:43:29 +00:00
parent e8ef27900c
commit edba407843
1 changed files with 68 additions and 0 deletions
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68
arch/arm64/kvm/sys_regs.c
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@ -5090,12 +5090,80 @@ static const struct seq_operations idregs_debug_sops = {
DEFINE_SEQ_ATTRIBUTE(idregs_debug);
static const struct sys_reg_desc *sr_resx_find(struct kvm *kvm, loff_t pos)
{
unsigned long i, sr_idx = 0;
for (i = 0; i < ARRAY_SIZE(sys_reg_descs); i++) {
const struct sys_reg_desc *r = &sys_reg_descs[i];
if (r->reg < __SANITISED_REG_START__)
continue;
if (sr_idx++ == pos)
return r;
}
return NULL;
}
static void *sr_resx_start(struct seq_file *s, loff_t *pos)
{
struct kvm *kvm = s->private;
if (!kvm->arch.sysreg_masks)
return NULL;
return (void *)sr_resx_find(kvm, *pos);
}
static void *sr_resx_next(struct seq_file *s, void *v, loff_t *pos)
{
struct kvm *kvm = s->private;
(*pos)++;
return (void *)sr_resx_find(kvm, *pos);
}
static void sr_resx_stop(struct seq_file *s, void *v)
{
}
static int sr_resx_show(struct seq_file *s, void *v)
{
const struct sys_reg_desc *desc = v;
struct kvm *kvm = s->private;
struct resx resx;
if (!desc)
return 0;
resx = kvm_get_sysreg_resx(kvm, desc->reg);
seq_printf(s, "%20s:\tRES0:%016llx\tRES1:%016llx\n",
desc->name, resx.res0, resx.res1);
return 0;
}
static const struct seq_operations sr_resx_sops = {
.start = sr_resx_start,
.next = sr_resx_next,
.stop = sr_resx_stop,
.show = sr_resx_show,
};
DEFINE_SEQ_ATTRIBUTE(sr_resx);
void kvm_sys_regs_create_debugfs(struct kvm *kvm)
{
kvm->arch.idreg_debugfs_iter = ~0;
debugfs_create_file("idregs", 0444, kvm->debugfs_dentry, kvm,
&idregs_debug_fops);
debugfs_create_file("resx", 0444, kvm->debugfs_dentry, kvm,
&sr_resx_fops);
}
static void reset_vm_ftr_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *reg)