[PATCH v2 2/5] riscv: kvm: drop 32-bit host support

Arnd Bergmann
2024-12-21T21:49:22Z

From: Arnd Bergmann <arnd@arndb.de>

KVM support on RISC-V includes both 32-bit and 64-bit host mode, but in
practice, all RISC-V SoCs that may use this are 64-bit:

As of linux-6.13, there is no mainline Linux support for any specific
32-bit SoC in arch/riscv/, although the generic qemu model should work.

The available RV32 CPU implementations are mostly built for
microcontroller applications and are lacking a memory management
unit. There are a few CPU cores with an MMU, but those still lack the
hypervisor extensions needed for running KVM.

This is unlikely to change in the future, so remove the 32-bit host
code and simplify the test matrix.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/riscv/kvm/Kconfig | 2 +-
arch/riscv/kvm/aia.c | 105 ------------------------------
arch/riscv/kvm/aia_imsic.c | 34 ----------
arch/riscv/kvm/mmu.c | 8 ---
arch/riscv/kvm/vcpu_exit.c | 4 --
arch/riscv/kvm/vcpu_insn.c | 12 ----
arch/riscv/kvm/vcpu_sbi_pmu.c | 8 ---
arch/riscv/kvm/vcpu_sbi_replace.c | 4 --
arch/riscv/kvm/vcpu_sbi_v01.c | 4 --
arch/riscv/kvm/vcpu_timer.c | 20 ------
10 files changed, 1 insertion(+), 200 deletions(-)

diff --git a/arch/riscv/kvm/Kconfig b/arch/riscv/kvm/Kconfig
index 0c3cbb0915ff..7405722e4433 100644
--- a/arch/riscv/kvm/Kconfig
+++ b/arch/riscv/kvm/Kconfig
@@ -19,7 +19,7 @@ if VIRTUALIZATION

config KVM
tristate "Kernel-based Virtual Machine (KVM) support (EXPERIMENTAL)"
- depends on RISCV_SBI && MMU
+ depends on RISCV_SBI && MMU && 64BIT
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQ_ROUTING
select HAVE_KVM_MSI
diff --git a/arch/riscv/kvm/aia.c b/arch/riscv/kvm/aia.c
index 19afd1f23537..a399a5a9af0e 100644
--- a/arch/riscv/kvm/aia.c
+++ b/arch/riscv/kvm/aia.c
@@ -66,33 +66,6 @@ static inline unsigned long aia_hvictl_value(bool ext_irq_pending)
return hvictl;
}

-#ifdef CONFIG_32BIT
-void kvm_riscv_vcpu_aia_flush_interrupts(struct kvm_vcpu *vcpu)
-{
- struct kvm_vcpu_aia_csr *csr = &vcpu->arch.aia_context.guest_csr;
- unsigned long mask, val;
-
- if (!kvm_riscv_aia_available())
- return;
-
- if (READ_ONCE(vcpu->arch.irqs_pending_mask[1])) {
- mask = xchg_acquire(&vcpu->arch.irqs_pending_mask[1], 0);
- val = READ_ONCE(vcpu->arch.irqs_pending[1]) & mask;
-
- csr->hviph &= ~mask;
- csr->hviph |= val;
- }
-}
-
-void kvm_riscv_vcpu_aia_sync_interrupts(struct kvm_vcpu *vcpu)
-{
- struct kvm_vcpu_aia_csr *csr = &vcpu->arch.aia_context.guest_csr;
-
- if (kvm_riscv_aia_available())
- csr->vsieh = ncsr_read(CSR_VSIEH);
-}
-#endif
-
bool kvm_riscv_vcpu_aia_has_interrupts(struct kvm_vcpu *vcpu, u64 mask)
{
int hgei;
@@ -101,12 +74,6 @@ bool kvm_riscv_vcpu_aia_has_interrupts(struct kvm_vcpu *vcpu, u64 mask)
if (!kvm_riscv_aia_available())
return false;

-#ifdef CONFIG_32BIT
- if (READ_ONCE(vcpu->arch.irqs_pending[1]) &
- (vcpu->arch.aia_context.guest_csr.vsieh & upper_32_bits(mask)))
- return true;
-#endif
-
seip = vcpu->arch.guest_csr.vsie;
seip &= (unsigned long)mask;
seip &= BIT(IRQ_S_EXT);
@@ -128,9 +95,6 @@ void kvm_riscv_vcpu_aia_update_hvip(struct kvm_vcpu *vcpu)
if (!kvm_riscv_aia_available())
return;

-#ifdef CONFIG_32BIT
- ncsr_write(CSR_HVIPH, vcpu->arch.aia_context.guest_csr.hviph);
-#endif
ncsr_write(CSR_HVICTL, aia_hvictl_value(!!(csr->hvip & BIT(IRQ_VS_EXT))));
}

@@ -147,22 +111,10 @@ void kvm_riscv_vcpu_aia_load(struct kvm_vcpu *vcpu, int cpu)
nacl_csr_write(nsh, CSR_VSISELECT, csr->vsiselect);
nacl_csr_write(nsh, CSR_HVIPRIO1, csr->hviprio1);
nacl_csr_write(nsh, CSR_HVIPRIO2, csr->hviprio2);
-#ifdef CONFIG_32BIT
- nacl_csr_write(nsh, CSR_VSIEH, csr->vsieh);
- nacl_csr_write(nsh, CSR_HVIPH, csr->hviph);
- nacl_csr_write(nsh, CSR_HVIPRIO1H, csr->hviprio1h);
- nacl_csr_write(nsh, CSR_HVIPRIO2H, csr->hviprio2h);
-#endif
} else {
csr_write(CSR_VSISELECT, csr->vsiselect);
csr_write(CSR_HVIPRIO1, csr->hviprio1);
csr_write(CSR_HVIPRIO2, csr->hviprio2);
-#ifdef CONFIG_32BIT
- csr_write(CSR_VSIEH, csr->vsieh);
- csr_write(CSR_HVIPH, csr->hviph);
- csr_write(CSR_HVIPRIO1H, csr->hviprio1h);
- csr_write(CSR_HVIPRIO2H, csr->hviprio2h);
-#endif
}
}

@@ -179,22 +131,10 @@ void kvm_riscv_vcpu_aia_put(struct kvm_vcpu *vcpu)
csr->vsiselect = nacl_csr_read(nsh, CSR_VSISELECT);
csr->hviprio1 = nacl_csr_read(nsh, CSR_HVIPRIO1);
csr->hviprio2 = nacl_csr_read(nsh, CSR_HVIPRIO2);
-#ifdef CONFIG_32BIT
- csr->vsieh = nacl_csr_read(nsh, CSR_VSIEH);
- csr->hviph = nacl_csr_read(nsh, CSR_HVIPH);
- csr->hviprio1h = nacl_csr_read(nsh, CSR_HVIPRIO1H);
- csr->hviprio2h = nacl_csr_read(nsh, CSR_HVIPRIO2H);
-#endif
} else {
csr->vsiselect = csr_read(CSR_VSISELECT);
csr->hviprio1 = csr_read(CSR_HVIPRIO1);
csr->hviprio2 = csr_read(CSR_HVIPRIO2);
-#ifdef CONFIG_32BIT
- csr->vsieh = csr_read(CSR_VSIEH);
- csr->hviph = csr_read(CSR_HVIPH);
- csr->hviprio1h = csr_read(CSR_HVIPRIO1H);
- csr->hviprio2h = csr_read(CSR_HVIPRIO2H);
-#endif
}
}

@@ -226,10 +166,6 @@ int kvm_riscv_vcpu_aia_set_csr(struct kvm_vcpu *vcpu,
if (kvm_riscv_aia_available()) {
((unsigned long *)csr)[reg_num] = val;

-#ifdef CONFIG_32BIT
- if (reg_num == KVM_REG_RISCV_CSR_AIA_REG(siph))
- WRITE_ONCE(vcpu->arch.irqs_pending_mask[1], 0);
-#endif
}

return 0;
@@ -282,19 +218,8 @@ static u8 aia_get_iprio8(struct kvm_vcpu *vcpu, unsigned int irq)
hviprio = ncsr_read(CSR_HVIPRIO1);
break;
case 1:
-#ifndef CONFIG_32BIT
hviprio = ncsr_read(CSR_HVIPRIO2);
break;
-#else
- hviprio = ncsr_read(CSR_HVIPRIO1H);
- break;
- case 2:
- hviprio = ncsr_read(CSR_HVIPRIO2);
- break;
- case 3:
- hviprio = ncsr_read(CSR_HVIPRIO2H);
- break;
-#endif
default:
return 0;
}
@@ -315,19 +240,8 @@ static void aia_set_iprio8(struct kvm_vcpu *vcpu, unsigned int irq, u8 prio)
hviprio = ncsr_read(CSR_HVIPRIO1);
break;
case 1:
-#ifndef CONFIG_32BIT
- hviprio = ncsr_read(CSR_HVIPRIO2);
- break;
-#else
- hviprio = ncsr_read(CSR_HVIPRIO1H);
- break;
- case 2:
hviprio = ncsr_read(CSR_HVIPRIO2);
break;
- case 3:
- hviprio = ncsr_read(CSR_HVIPRIO2H);
- break;
-#endif
default:
return;
}
@@ -340,19 +254,8 @@ static void aia_set_iprio8(struct kvm_vcpu *vcpu, unsigned int irq, u8 prio)
ncsr_write(CSR_HVIPRIO1, hviprio);
break;
case 1:
-#ifndef CONFIG_32BIT
ncsr_write(CSR_HVIPRIO2, hviprio);
break;
-#else
- ncsr_write(CSR_HVIPRIO1H, hviprio);
- break;
- case 2:
- ncsr_write(CSR_HVIPRIO2, hviprio);
- break;
- case 3:
- ncsr_write(CSR_HVIPRIO2H, hviprio);
- break;
-#endif
default:
return;
}
@@ -366,10 +269,8 @@ static int aia_rmw_iprio(struct kvm_vcpu *vcpu, unsigned int isel,
unsigned long old_val;
u8 prio;

-#ifndef CONFIG_32BIT
if (isel & 0x1)
return KVM_INSN_ILLEGAL_TRAP;
-#endif

nirqs = 4 * (BITS_PER_LONG / 32);
first_irq = (isel - ISELECT_IPRIO0) * 4;
@@ -577,12 +478,6 @@ void kvm_riscv_aia_enable(void)
csr_write(CSR_HVICTL, aia_hvictl_value(false));
csr_write(CSR_HVIPRIO1, 0x0);
csr_write(CSR_HVIPRIO2, 0x0);
-#ifdef CONFIG_32BIT
- csr_write(CSR_HVIPH, 0x0);
- csr_write(CSR_HIDELEGH, 0x0);
- csr_write(CSR_HVIPRIO1H, 0x0);
- csr_write(CSR_HVIPRIO2H, 0x0);
-#endif

/* Enable per-CPU SGEI interrupt */
enable_percpu_irq(hgei_parent_irq,
diff --git a/arch/riscv/kvm/aia_imsic.c b/arch/riscv/kvm/aia_imsic.c
index a8085cd8215e..16c44b10ee97 100644
--- a/arch/riscv/kvm/aia_imsic.c
+++ b/arch/riscv/kvm/aia_imsic.c
@@ -258,13 +258,7 @@ static u32 imsic_mrif_topei(struct imsic_mrif *mrif, u32 nr_eix, u32 nr_msis)
eix = &mrif->eix[ei];
eipend[0] = imsic_mrif_atomic_read(mrif, &eix->eie[0]) &
imsic_mrif_atomic_read(mrif, &eix->eip[0]);
-#ifdef CONFIG_32BIT
- eipend[1] = imsic_mrif_atomic_read(mrif, &eix->eie[1]) &
- imsic_mrif_atomic_read(mrif, &eix->eip[1]);
- if (!eipend[0] && !eipend[1])
-#else
if (!eipend[0])
-#endif
continue;

imin = ei * BITS_PER_TYPE(u64);
@@ -296,10 +290,8 @@ static int imsic_mrif_isel_check(u32 nr_eix, unsigned long isel)
default:
return -ENOENT;
}
-#ifndef CONFIG_32BIT
if (num & 0x1)
return -EINVAL;
-#endif
if ((num / 2) >= nr_eix)
return -EINVAL;

@@ -337,13 +329,9 @@ static int imsic_mrif_rmw(struct imsic_mrif *mrif, u32 nr_eix,
return -EINVAL;
eix = &mrif->eix[num / 2];

-#ifndef CONFIG_32BIT
if (num & 0x1)
return -EINVAL;
ei = (pend) ? &eix->eip[0] : &eix->eie[0];
-#else
- ei = (pend) ? &eix->eip[num & 0x1] : &eix->eie[num & 0x1];
-#endif

/* Bit0 of EIP0 or EIE0 is read-only */
if (!num)
@@ -395,10 +383,6 @@ static void imsic_vsfile_local_read(void *data)
eix = &mrif->eix[i];
eix->eip[0] = imsic_eix_swap(IMSIC_EIP0 + i * 2, 0);
eix->eie[0] = imsic_eix_swap(IMSIC_EIE0 + i * 2, 0);
-#ifdef CONFIG_32BIT
- eix->eip[1] = imsic_eix_swap(IMSIC_EIP0 + i * 2 + 1, 0);
- eix->eie[1] = imsic_eix_swap(IMSIC_EIE0 + i * 2 + 1, 0);
-#endif
}
} else {
mrif->eidelivery = imsic_vs_csr_read(IMSIC_EIDELIVERY);
@@ -407,10 +391,6 @@ static void imsic_vsfile_local_read(void *data)
eix = &mrif->eix[i];
eix->eip[0] = imsic_eix_read(IMSIC_EIP0 + i * 2);
eix->eie[0] = imsic_eix_read(IMSIC_EIE0 + i * 2);
-#ifdef CONFIG_32BIT
- eix->eip[1] = imsic_eix_read(IMSIC_EIP0 + i * 2 + 1);
- eix->eie[1] = imsic_eix_read(IMSIC_EIE0 + i * 2 + 1);
-#endif
}
}

@@ -469,10 +449,8 @@ static void imsic_vsfile_local_rw(void *data)
break;
case IMSIC_EIP0 ... IMSIC_EIP63:
case IMSIC_EIE0 ... IMSIC_EIE63:
-#ifndef CONFIG_32BIT
if (idata->isel & 0x1)
break;
-#endif
if (idata->write)
imsic_eix_write(idata->isel, idata->val);
else
@@ -536,10 +514,6 @@ static void imsic_vsfile_local_clear(int vsfile_hgei, u32 nr_eix)
for (i = 0; i < nr_eix; i++) {
imsic_eix_write(IMSIC_EIP0 + i * 2, 0);
imsic_eix_write(IMSIC_EIE0 + i * 2, 0);
-#ifdef CONFIG_32BIT
- imsic_eix_write(IMSIC_EIP0 + i * 2 + 1, 0);
- imsic_eix_write(IMSIC_EIE0 + i * 2 + 1, 0);
-#endif
}

csr_write(CSR_HSTATUS, old_hstatus);
@@ -573,10 +547,6 @@ static void imsic_vsfile_local_update(int vsfile_hgei, u32 nr_eix,
eix = &mrif->eix[i];
imsic_eix_set(IMSIC_EIP0 + i * 2, eix->eip[0]);
imsic_eix_set(IMSIC_EIE0 + i * 2, eix->eie[0]);
-#ifdef CONFIG_32BIT
- imsic_eix_set(IMSIC_EIP0 + i * 2 + 1, eix->eip[1]);
- imsic_eix_set(IMSIC_EIE0 + i * 2 + 1, eix->eie[1]);
-#endif
}
imsic_vs_csr_write(IMSIC_EITHRESHOLD, mrif->eithreshold);
imsic_vs_csr_write(IMSIC_EIDELIVERY, mrif->eidelivery);
@@ -667,10 +637,6 @@ static void imsic_swfile_update(struct kvm_vcpu *vcpu,
eix = &mrif->eix[i];
imsic_mrif_atomic_or(smrif, &seix->eip[0], eix->eip[0]);
imsic_mrif_atomic_or(smrif, &seix->eie[0], eix->eie[0]);
-#ifdef CONFIG_32BIT
- imsic_mrif_atomic_or(smrif, &seix->eip[1], eix->eip[1]);
- imsic_mrif_atomic_or(smrif, &seix->eie[1], eix->eie[1]);
-#endif
}

imsic_swfile_extirq_update(vcpu);
diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index 1087ea74567b..2aee1100d450 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -19,15 +19,9 @@
#include <asm/page.h>
#include <asm/pgtable.h>

-#ifdef CONFIG_64BIT
static unsigned long gstage_mode __ro_after_init = (HGATP_MODE_SV39X4 << HGATP_MODE_SHIFT);
static unsigned long gstage_pgd_levels __ro_after_init = 3;
#define gstage_index_bits 9
-#else
-static unsigned long gstage_mode __ro_after_init = (HGATP_MODE_SV32X4 << HGATP_MODE_SHIFT);
-static unsigned long gstage_pgd_levels __ro_after_init = 2;
-#define gstage_index_bits 10
-#endif

#define gstage_pgd_xbits 2
#define gstage_pgd_size (1UL << (HGATP_PAGE_SHIFT + gstage_pgd_xbits))
@@ -739,7 +733,6 @@ void kvm_riscv_gstage_update_hgatp(struct kvm_vcpu *vcpu)

void __init kvm_riscv_gstage_mode_detect(void)
{
-#ifdef CONFIG_64BIT
/* Try Sv57x4 G-stage mode */
csr_write(CSR_HGATP, HGATP_MODE_SV57X4 << HGATP_MODE_SHIFT);
if ((csr_read(CSR_HGATP) >> HGATP_MODE_SHIFT) == HGATP_MODE_SV57X4) {
@@ -758,7 +751,6 @@ void __init kvm_riscv_gstage_mode_detect(void)

csr_write(CSR_HGATP, 0);
kvm_riscv_local_hfence_gvma_all();
-#endif
}

unsigned long __init kvm_riscv_gstage_mode(void)
diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c
index fa98e5c024b2..f5d598f6acfc 100644
--- a/arch/riscv/kvm/vcpu_exit.c
+++ b/arch/riscv/kvm/vcpu_exit.c
@@ -107,11 +107,7 @@ unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu,
".option push\n"
".option norvc\n"
"add %[ttmp], %[taddr], 0\n"
-#ifdef CONFIG_64BIT
HLV_D(%[val], %[addr])
-#else
- HLV_W(%[val], %[addr])
-#endif
".option pop"
: [val] "=&r" (val),
[taddr] "+&r" (taddr), [ttmp] "+&r" (ttmp)
diff --git a/arch/riscv/kvm/vcpu_insn.c b/arch/riscv/kvm/vcpu_insn.c
index 97dec18e6989..913c454bee26 100644
--- a/arch/riscv/kvm/vcpu_insn.c
+++ b/arch/riscv/kvm/vcpu_insn.c
@@ -78,11 +78,7 @@

#define INSN_LEN(insn) (INSN_IS_16BIT(insn) ? 2 : 4)

-#ifdef CONFIG_64BIT
#define LOG_REGBYTES 3
-#else
-#define LOG_REGBYTES 2
-#endif
#define REGBYTES (1 << LOG_REGBYTES)

#define SH_RD 7
@@ -522,19 +518,16 @@ int kvm_riscv_vcpu_mmio_load(struct kvm_vcpu *vcpu, struct kvm_run *run,
} else if ((insn & INSN_MASK_LBU) == INSN_MATCH_LBU) {
len = 1;
shift = 8 * (sizeof(ulong) - len);
-#ifdef CONFIG_64BIT
} else if ((insn & INSN_MASK_LD) == INSN_MATCH_LD) {
len = 8;
shift = 8 * (sizeof(ulong) - len);
} else if ((insn & INSN_MASK_LWU) == INSN_MATCH_LWU) {
len = 4;
-#endif
} else if ((insn & INSN_MASK_LH) == INSN_MATCH_LH) {
len = 2;
shift = 8 * (sizeof(ulong) - len);
} else if ((insn & INSN_MASK_LHU) == INSN_MATCH_LHU) {
len = 2;
-#ifdef CONFIG_64BIT
} else if ((insn & INSN_MASK_C_LD) == INSN_MATCH_C_LD) {
len = 8;
shift = 8 * (sizeof(ulong) - len);
@@ -543,7 +536,6 @@ int kvm_riscv_vcpu_mmio_load(struct kvm_vcpu *vcpu, struct kvm_run *run,
((insn >> SH_RD) & 0x1f)) {
len = 8;
shift = 8 * (sizeof(ulong) - len);
-#endif
} else if ((insn & INSN_MASK_C_LW) == INSN_MATCH_C_LW) {
len = 4;
shift = 8 * (sizeof(ulong) - len);
@@ -645,13 +637,10 @@ int kvm_riscv_vcpu_mmio_store(struct kvm_vcpu *vcpu, struct kvm_run *run,
len = 4;
} else if ((insn & INSN_MASK_SB) == INSN_MATCH_SB) {
len = 1;
-#ifdef CONFIG_64BIT
} else if ((insn & INSN_MASK_SD) == INSN_MATCH_SD) {
len = 8;
-#endif
} else if ((insn & INSN_MASK_SH) == INSN_MATCH_SH) {
len = 2;
-#ifdef CONFIG_64BIT
} else if ((insn & INSN_MASK_C_SD) == INSN_MATCH_C_SD) {
len = 8;
data64 = GET_RS2S(insn, &vcpu->arch.guest_context);
@@ -659,7 +648,6 @@ int kvm_riscv_vcpu_mmio_store(struct kvm_vcpu *vcpu, struct kvm_run *run,
((insn >> SH_RD) & 0x1f)) {
len = 8;
data64 = GET_RS2C(insn, &vcpu->arch.guest_context);
-#endif
} else if ((insn & INSN_MASK_C_SW) == INSN_MATCH_C_SW) {
len = 4;
data32 = GET_RS2S(insn, &vcpu->arch.guest_context);
diff --git a/arch/riscv/kvm/vcpu_sbi_pmu.c b/arch/riscv/kvm/vcpu_sbi_pmu.c
index e4be34e03e83..0871265416fa 100644
--- a/arch/riscv/kvm/vcpu_sbi_pmu.c
+++ b/arch/riscv/kvm/vcpu_sbi_pmu.c
@@ -35,11 +35,7 @@ static int kvm_sbi_ext_pmu_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
ret = kvm_riscv_vcpu_pmu_ctr_info(vcpu, cp->a0, retdata);
break;
case SBI_EXT_PMU_COUNTER_CFG_MATCH:
-#if defined(CONFIG_32BIT)
- temp = ((uint64_t)cp->a5 << 32) | cp->a4;
-#else
temp = cp->a4;
-#endif
/*
* This can fail if perf core framework fails to create an event.
* No need to forward the error to userspace and exit the guest.
@@ -50,11 +46,7 @@ static int kvm_sbi_ext_pmu_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
cp->a2, cp->a3, temp, retdata);
break;
case SBI_EXT_PMU_COUNTER_START:
-#if defined(CONFIG_32BIT)
- temp = ((uint64_t)cp->a4 << 32) | cp->a3;
-#else
temp = cp->a3;
-#endif
ret = kvm_riscv_vcpu_pmu_ctr_start(vcpu, cp->a0, cp->a1, cp->a2,
temp, retdata);
break;
diff --git a/arch/riscv/kvm/vcpu_sbi_replace.c b/arch/riscv/kvm/vcpu_sbi_replace.c
index 9c2ab3dfa93a..9276140644d1 100644
--- a/arch/riscv/kvm/vcpu_sbi_replace.c
+++ b/arch/riscv/kvm/vcpu_sbi_replace.c
@@ -26,11 +26,7 @@ static int kvm_sbi_ext_time_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
}

kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_SET_TIMER);
-#if __riscv_xlen == 32
- next_cycle = ((u64)cp->a1 << 32) | (u64)cp->a0;
-#else
next_cycle = (u64)cp->a0;
-#endif
kvm_riscv_vcpu_timer_next_event(vcpu, next_cycle);

return 0;
diff --git a/arch/riscv/kvm/vcpu_sbi_v01.c b/arch/riscv/kvm/vcpu_sbi_v01.c
index 8f4c4fa16227..e06ba01392d6 100644
--- a/arch/riscv/kvm/vcpu_sbi_v01.c
+++ b/arch/riscv/kvm/vcpu_sbi_v01.c
@@ -35,11 +35,7 @@ static int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
retdata->uexit = true;
break;
case SBI_EXT_0_1_SET_TIMER:
-#if __riscv_xlen == 32
- next_cycle = ((u64)cp->a1 << 32) | (u64)cp->a0;
-#else
next_cycle = (u64)cp->a0;
-#endif
ret = kvm_riscv_vcpu_timer_next_event(vcpu, next_cycle);
break;
case SBI_EXT_0_1_CLEAR_IPI:
diff --git a/arch/riscv/kvm/vcpu_timer.c b/arch/riscv/kvm/vcpu_timer.c
index 96e7a4e463f7..fc32338b8cf8 100644
--- a/arch/riscv/kvm/vcpu_timer.c
+++ b/arch/riscv/kvm/vcpu_timer.c
@@ -71,12 +71,7 @@ static int kvm_riscv_vcpu_timer_cancel(struct kvm_vcpu_timer *t)

static int kvm_riscv_vcpu_update_vstimecmp(struct kvm_vcpu *vcpu, u64 ncycles)
{
-#if defined(CONFIG_32BIT)
- ncsr_write(CSR_VSTIMECMP, ncycles & 0xFFFFFFFF);
- ncsr_write(CSR_VSTIMECMPH, ncycles >> 32);
-#else
ncsr_write(CSR_VSTIMECMP, ncycles);
-#endif
return 0;
}

@@ -288,12 +283,7 @@ static void kvm_riscv_vcpu_update_timedelta(struct kvm_vcpu *vcpu)
{
struct kvm_guest_timer *gt = &vcpu->kvm->arch.timer;

-#if defined(CONFIG_32BIT)
- ncsr_write(CSR_HTIMEDELTA, (u32)(gt->time_delta));
- ncsr_write(CSR_HTIMEDELTAH, (u32)(gt->time_delta >> 32));
-#else
ncsr_write(CSR_HTIMEDELTA, gt->time_delta);
-#endif
}

void kvm_riscv_vcpu_timer_restore(struct kvm_vcpu *vcpu)
@@ -305,12 +295,7 @@ void kvm_riscv_vcpu_timer_restore(struct kvm_vcpu *vcpu)
if (!t->sstc_enabled)
return;

-#if defined(CONFIG_32BIT)
- ncsr_write(CSR_VSTIMECMP, (u32)t->next_cycles);
- ncsr_write(CSR_VSTIMECMPH, (u32)(t->next_cycles >> 32));
-#else
ncsr_write(CSR_VSTIMECMP, t->next_cycles);
-#endif

/* timer should be enabled for the remaining operations */
if (unlikely(!t->init_done))
@@ -326,12 +311,7 @@ void kvm_riscv_vcpu_timer_sync(struct kvm_vcpu *vcpu)
if (!t->sstc_enabled)
return;

-#if defined(CONFIG_32BIT)
t->next_cycles = ncsr_read(CSR_VSTIMECMP);
- t->next_cycles |= (u64)ncsr_read(CSR_VSTIMECMPH) << 32;
-#else
- t->next_cycles = ncsr_read(CSR_VSTIMECMP);
-#endif
}

void kvm_riscv_vcpu_timer_save(struct kvm_vcpu *vcpu)
--
2.39.5