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KVM: arm64: Move CNT*_CTL_EL0 userspace accessors to generic infrastructure

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Remove the handling of CNT*_CTL_EL0 from guest.c, and move it to
sys_regs.c, using a new TIMER_REG() definition to encapsulate it.

Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier
2025-09-29 17:04:50 +01:00
parent 77a0c42eaf
commit 09424d5d7d
2 changed files with 31 additions and 9 deletions
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4
arch/arm64/kvm/guest.c
View File

@@ -592,10 +592,8 @@ static unsigned long num_core_regs(const struct kvm_vcpu *vcpu)
}
static const u64 timer_reg_list[] = {
KVM_REG_ARM_TIMER_CTL,
KVM_REG_ARM_TIMER_CNT,
KVM_REG_ARM_TIMER_CVAL,
KVM_REG_ARM_PTIMER_CTL,
KVM_REG_ARM_PTIMER_CNT,
KVM_REG_ARM_PTIMER_CVAL,
};
@@ -605,10 +603,8 @@ static const u64 timer_reg_list[] = {
static bool is_timer_reg(u64 index)
{
switch (index) {
case KVM_REG_ARM_TIMER_CTL:
case KVM_REG_ARM_TIMER_CNT:
case KVM_REG_ARM_TIMER_CVAL:
case KVM_REG_ARM_PTIMER_CTL:
case KVM_REG_ARM_PTIMER_CNT:
case KVM_REG_ARM_PTIMER_CVAL:
return true;

36
arch/arm64/kvm/sys_regs.c
View File

@@ -1594,6 +1594,23 @@ static bool access_arch_timer(struct kvm_vcpu *vcpu,
return true;
}
static int arch_timer_set_user(struct kvm_vcpu *vcpu,
const struct sys_reg_desc *rd,
u64 val)
{
switch (reg_to_encoding(rd)) {
case SYS_CNTV_CTL_EL0:
case SYS_CNTP_CTL_EL0:
case SYS_CNTHV_CTL_EL2:
case SYS_CNTHP_CTL_EL2:
val &= ~ARCH_TIMER_CTRL_IT_STAT;
break;
}
__vcpu_assign_sys_reg(vcpu, rd->reg, val);
return 0;
}
static s64 kvm_arm64_ftr_safe_value(u32 id, const struct arm64_ftr_bits *ftrp,
s64 new, s64 cur)
{
@@ -2496,15 +2513,20 @@ static bool bad_redir_trap(struct kvm_vcpu *vcpu,
"trap of EL2 register redirected to EL1");
}
#define EL2_REG_FILTERED(name, acc, rst, v, filter) { \
#define SYS_REG_USER_FILTER(name, acc, rst, v, gu, su, filter) { \
SYS_DESC(SYS_##name), \
.access = acc, \
.reset = rst, \
.reg = name, \
.get_user = gu, \
.set_user = su, \
.visibility = filter, \
.val = v, \
}
#define EL2_REG_FILTERED(name, acc, rst, v, filter) \
SYS_REG_USER_FILTER(name, acc, rst, v, NULL, NULL, filter)
#define EL2_REG(name, acc, rst, v) \
EL2_REG_FILTERED(name, acc, rst, v, el2_visibility)
@@ -2515,6 +2537,10 @@ static bool bad_redir_trap(struct kvm_vcpu *vcpu,
EL2_REG_VNCR_FILT(name, hidden_visibility)
#define EL2_REG_REDIR(name, rst, v) EL2_REG(name, bad_redir_trap, rst, v)
#define TIMER_REG(name, vis) \
SYS_REG_USER_FILTER(name, access_arch_timer, reset_val, 0, \
NULL, arch_timer_set_user, vis)
/*
* Since reset() callback and field val are not used for idregs, they will be
* used for specific purposes for idregs.
@@ -3485,11 +3511,11 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ SYS_DESC(SYS_CNTPCTSS_EL0), access_arch_timer },
{ SYS_DESC(SYS_CNTVCTSS_EL0), access_arch_timer },
{ SYS_DESC(SYS_CNTP_TVAL_EL0), access_arch_timer },
{ SYS_DESC(SYS_CNTP_CTL_EL0), access_arch_timer },
TIMER_REG(CNTP_CTL_EL0, NULL),
{ SYS_DESC(SYS_CNTP_CVAL_EL0), access_arch_timer },
{ SYS_DESC(SYS_CNTV_TVAL_EL0), access_arch_timer },
{ SYS_DESC(SYS_CNTV_CTL_EL0), access_arch_timer },
TIMER_REG(CNTV_CTL_EL0, NULL),
{ SYS_DESC(SYS_CNTV_CVAL_EL0), access_arch_timer },
/* PMEVCNTRn_EL0 */
@@ -3688,11 +3714,11 @@ static const struct sys_reg_desc sys_reg_descs[] = {
EL2_REG_VNCR(CNTVOFF_EL2, reset_val, 0),
EL2_REG(CNTHCTL_EL2, access_rw, reset_val, 0),
{ SYS_DESC(SYS_CNTHP_TVAL_EL2), access_arch_timer },
EL2_REG(CNTHP_CTL_EL2, access_arch_timer, reset_val, 0),
TIMER_REG(CNTHP_CTL_EL2, el2_visibility),
EL2_REG(CNTHP_CVAL_EL2, access_arch_timer, reset_val, 0),
{ SYS_DESC(SYS_CNTHV_TVAL_EL2), access_arch_timer, .visibility = cnthv_visibility },
EL2_REG_FILTERED(CNTHV_CTL_EL2, access_arch_timer, reset_val, 0, cnthv_visibility),
TIMER_REG(CNTHV_CTL_EL2, cnthv_visibility),
EL2_REG_FILTERED(CNTHV_CVAL_EL2, access_arch_timer, reset_val, 0, cnthv_visibility),
{ SYS_DESC(SYS_CNTKCTL_EL12), access_cntkctl_el12 },