diff options
| -rw-r--r-- | arch/arm64/include/asm/sysreg.h | 2 | ||||
| -rw-r--r-- | arch/arm64/kvm/arch_timer.c | 98 | ||||
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/timer-sr.c | 18 | ||||
| -rw-r--r-- | arch/arm64/kvm/sys_regs.c | 9 |
4 files changed, 98 insertions, 29 deletions
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index 9e3ecba3c4e6..f8da9e1b0c11 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -388,6 +388,7 @@ #define SYS_CNTFRQ_EL0 sys_reg(3, 3, 14, 0, 0) +#define SYS_CNTPCT_EL0 sys_reg(3, 3, 14, 0, 1) #define SYS_CNTPCTSS_EL0 sys_reg(3, 3, 14, 0, 5) #define SYS_CNTVCTSS_EL0 sys_reg(3, 3, 14, 0, 6) @@ -400,6 +401,7 @@ #define SYS_AARCH32_CNTP_TVAL sys_reg(0, 0, 14, 2, 0) #define SYS_AARCH32_CNTP_CTL sys_reg(0, 0, 14, 2, 1) +#define SYS_AARCH32_CNTPCT sys_reg(0, 0, 0, 14, 0) #define SYS_AARCH32_CNTP_CVAL sys_reg(0, 2, 0, 14, 0) #define __PMEV_op2(n) ((n) & 0x7) diff --git a/arch/arm64/kvm/arch_timer.c b/arch/arm64/kvm/arch_timer.c index 3118ea0a1b41..bb64a71ae193 100644 --- a/arch/arm64/kvm/arch_timer.c +++ b/arch/arm64/kvm/arch_timer.c @@ -458,6 +458,8 @@ static void timer_save_state(struct arch_timer_context *ctx) goto out; switch (index) { + u64 cval; + case TIMER_VTIMER: timer_set_ctl(ctx, read_sysreg_el0(SYS_CNTV_CTL)); timer_set_cval(ctx, read_sysreg_el0(SYS_CNTV_CVAL)); @@ -485,7 +487,12 @@ static void timer_save_state(struct arch_timer_context *ctx) break; case TIMER_PTIMER: timer_set_ctl(ctx, read_sysreg_el0(SYS_CNTP_CTL)); - timer_set_cval(ctx, read_sysreg_el0(SYS_CNTP_CVAL)); + cval = read_sysreg_el0(SYS_CNTP_CVAL); + + if (!has_cntpoff()) + cval -= timer_get_offset(ctx); + + timer_set_cval(ctx, cval); /* Disable the timer */ write_sysreg_el0(0, SYS_CNTP_CTL); @@ -555,6 +562,8 @@ static void timer_restore_state(struct arch_timer_context *ctx) goto out; switch (index) { + u64 cval, offset; + case TIMER_VTIMER: set_cntvoff(timer_get_offset(ctx)); write_sysreg_el0(timer_get_cval(ctx), SYS_CNTV_CVAL); @@ -562,8 +571,12 @@ static void timer_restore_state(struct arch_timer_context *ctx) write_sysreg_el0(timer_get_ctl(ctx), SYS_CNTV_CTL); break; case TIMER_PTIMER: - set_cntpoff(timer_get_offset(ctx)); - write_sysreg_el0(timer_get_cval(ctx), SYS_CNTP_CVAL); + cval = timer_get_cval(ctx); + offset = timer_get_offset(ctx); + set_cntpoff(offset); + if (!has_cntpoff()) + cval += offset; + write_sysreg_el0(cval, SYS_CNTP_CVAL); isb(); write_sysreg_el0(timer_get_ctl(ctx), SYS_CNTP_CTL); break; @@ -634,6 +647,61 @@ static void kvm_timer_vcpu_load_nogic(struct kvm_vcpu *vcpu) enable_percpu_irq(host_vtimer_irq, host_vtimer_irq_flags); } +/* If _pred is true, set bit in _set, otherwise set it in _clr */ +#define assign_clear_set_bit(_pred, _bit, _clr, _set) \ + do { \ + if (_pred) \ + (_set) |= (_bit); \ + else \ + (_clr) |= (_bit); \ + } while (0) + +static void timer_set_traps(struct kvm_vcpu *vcpu, struct timer_map *map) +{ + bool tpt, tpc; + u64 clr, set; + + /* + * No trapping gets configured here with nVHE. See + * __timer_enable_traps(), which is where the stuff happens. + */ + if (!has_vhe()) + return; + + /* + * Our default policy is not to trap anything. As we progress + * within this function, reality kicks in and we start adding + * traps based on emulation requirements. + */ + tpt = tpc = false; + + /* + * We have two possibility to deal with a physical offset: + * + * - Either we have CNTPOFF (yay!) or the offset is 0: + * we let the guest freely access the HW + * + * - or neither of these condition apply: + * we trap accesses to the HW, but still use it + * after correcting the physical offset + */ + if (!has_cntpoff() && timer_get_offset(map->direct_ptimer)) + tpt = tpc = true; + + /* + * Now that we have collected our requirements, compute the + * trap and enable bits. + */ + set = 0; + clr = 0; + + assign_clear_set_bit(tpt, CNTHCTL_EL1PCEN << 10, set, clr); + assign_clear_set_bit(tpc, CNTHCTL_EL1PCTEN << 10, set, clr); + + /* This only happens on VHE, so use the CNTKCTL_EL1 accessor */ + sysreg_clear_set(cntkctl_el1, clr, set); +} + void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu) { struct arch_timer_cpu *timer = vcpu_timer(vcpu); @@ -657,9 +725,10 @@ void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu) timer_restore_state(map.direct_vtimer); if (map.direct_ptimer) timer_restore_state(map.direct_ptimer); - if (map.emul_ptimer) timer_emulate(map.emul_ptimer); + + timer_set_traps(vcpu, &map); } bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu) @@ -1292,28 +1361,11 @@ no_vgic: return 0; } -/* - * On VHE system, we only need to configure the EL2 timer trap register once, - * not for every world switch. - * The host kernel runs at EL2 with HCR_EL2.TGE == 1, - * and this makes those bits have no effect for the host kernel execution. - */ +/* If we have CNTPOFF, permanently set ECV to enable it */ void kvm_timer_init_vhe(void) { - /* When HCR_EL2.E2H ==1, EL1PCEN and EL1PCTEN are shifted by 10 */ - u32 cnthctl_shift = 10; - u64 val; - - /* - * VHE systems allow the guest direct access to the EL1 physical - * timer/counter. - */ - val = read_sysreg(cnthctl_el2); - val |= (CNTHCTL_EL1PCEN << cnthctl_shift); - val |= (CNTHCTL_EL1PCTEN << cnthctl_shift); if (cpus_have_final_cap(ARM64_HAS_ECV_CNTPOFF)) - val |= CNTHCTL_ECV; - write_sysreg(val, cnthctl_el2); + sysreg_clear_set(cntkctl_el1, 0, CNTHCTL_ECV); } static void set_timer_irqs(struct kvm *kvm, int vtimer_irq, int ptimer_irq) diff --git a/arch/arm64/kvm/hyp/nvhe/timer-sr.c b/arch/arm64/kvm/hyp/nvhe/timer-sr.c index 9072e71693ba..b185ac0dbd47 100644 --- a/arch/arm64/kvm/hyp/nvhe/timer-sr.c +++ b/arch/arm64/kvm/hyp/nvhe/timer-sr.c @@ -9,6 +9,7 @@ #include <linux/kvm_host.h> #include <asm/kvm_hyp.h> +#include <asm/kvm_mmu.h> void __kvm_timer_set_cntvoff(u64 cntvoff) { @@ -35,14 +36,19 @@ void __timer_disable_traps(struct kvm_vcpu *vcpu) */ void __timer_enable_traps(struct kvm_vcpu *vcpu) { - u64 val; + u64 clr = 0, set = 0; /* * Disallow physical timer access for the guest - * Physical counter access is allowed + * Physical counter access is allowed if no offset is enforced + * or running protected (we don't offset anything in this case). */ - val = read_sysreg(cnthctl_el2); - val &= ~CNTHCTL_EL1PCEN; - val |= CNTHCTL_EL1PCTEN; - write_sysreg(val, cnthctl_el2); + clr = CNTHCTL_EL1PCEN; + if (is_protected_kvm_enabled() || + !kern_hyp_va(vcpu->kvm)->arch.timer_data.poffset) + set |= CNTHCTL_EL1PCTEN; + else + clr |= CNTHCTL_EL1PCTEN; + + sysreg_clear_set(cnthctl_el2, clr, set); } diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 53749d3a0996..be7c2598e563 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1139,6 +1139,12 @@ static bool access_arch_timer(struct kvm_vcpu *vcpu, tmr = TIMER_PTIMER; treg = TIMER_REG_CVAL; break; + case SYS_CNTPCT_EL0: + case SYS_CNTPCTSS_EL0: + case SYS_AARCH32_CNTPCT: + tmr = TIMER_PTIMER; + treg = TIMER_REG_CNT; + break; default: print_sys_reg_msg(p, "%s", "Unhandled trapped timer register"); kvm_inject_undefined(vcpu); @@ -2075,6 +2081,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { AMU_AMEVTYPER1_EL0(14), AMU_AMEVTYPER1_EL0(15), + { SYS_DESC(SYS_CNTPCT_EL0), access_arch_timer }, + { SYS_DESC(SYS_CNTPCTSS_EL0), access_arch_timer }, { SYS_DESC(SYS_CNTP_TVAL_EL0), access_arch_timer }, { SYS_DESC(SYS_CNTP_CTL_EL0), access_arch_timer }, { SYS_DESC(SYS_CNTP_CVAL_EL0), access_arch_timer }, @@ -2525,6 +2533,7 @@ static const struct sys_reg_desc cp15_64_regs[] = { { Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, TTBR0_EL1 }, { CP15_PMU_SYS_REG(DIRECT, 0, 0, 9, 0), .access = access_pmu_evcntr }, { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI1R */ + { SYS_DESC(SYS_AARCH32_CNTPCT), access_arch_timer }, { Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, TTBR1_EL1 }, { Op1( 1), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_ASGI1R */ { Op1( 2), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI0R */ |