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KVM/arm64 fixes for 6.12, take #3

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- Stop wasting space in the HYP idmap, as we are dangerously close
   to the 4kB limit, and this has already exploded in -next
 
 - Fix another race in vgic_init()
 
 - Fix a UBSAN error when faking the cache topology with MTE
   enabled
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Merge tag 'kvmarm-fixes-6.12-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

KVM/arm64 fixes for 6.12, take #3

- Stop wasting space in the HYP idmap, as we are dangerously close
  to the 4kB limit, and this has already exploded in -next

- Fix another race in vgic_init()

- Fix a UBSAN error when faking the cache topology with MTE
  enabled
This commit is contained in:
Paolo Bonzini 2024-10-20 12:10:59 -04:00
commit e9001a382f
6 changed files with 49 additions and 27 deletions
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1
arch/arm64/include/asm/kvm_asm.h
View File

@ -178,6 +178,7 @@ struct kvm_nvhe_init_params {
unsigned long hcr_el2;
unsigned long vttbr;
unsigned long vtcr;
unsigned long tmp;
};
/*

1
arch/arm64/kernel/asm-offsets.c
View File

@ -146,6 +146,7 @@ int main(void)
DEFINE(NVHE_INIT_HCR_EL2, offsetof(struct kvm_nvhe_init_params, hcr_el2));
DEFINE(NVHE_INIT_VTTBR, offsetof(struct kvm_nvhe_init_params, vttbr));
DEFINE(NVHE_INIT_VTCR, offsetof(struct kvm_nvhe_init_params, vtcr));
DEFINE(NVHE_INIT_TMP, offsetof(struct kvm_nvhe_init_params, tmp));
#endif
#ifdef CONFIG_CPU_PM
DEFINE(CPU_CTX_SP, offsetof(struct cpu_suspend_ctx, sp));

52
arch/arm64/kvm/hyp/nvhe/hyp-init.S
View File

@ -24,28 +24,25 @@
.align 11
SYM_CODE_START(__kvm_hyp_init)
ventry __invalid // Synchronous EL2t
ventry __invalid // IRQ EL2t
ventry __invalid // FIQ EL2t
ventry __invalid // Error EL2t
ventry . // Synchronous EL2t
ventry . // IRQ EL2t
ventry . // FIQ EL2t
ventry . // Error EL2t
ventry __invalid // Synchronous EL2h
ventry __invalid // IRQ EL2h
ventry __invalid // FIQ EL2h
ventry __invalid // Error EL2h
ventry . // Synchronous EL2h
ventry . // IRQ EL2h
ventry . // FIQ EL2h
ventry . // Error EL2h
ventry __do_hyp_init // Synchronous 64-bit EL1
ventry __invalid // IRQ 64-bit EL1
ventry __invalid // FIQ 64-bit EL1
ventry __invalid // Error 64-bit EL1
ventry . // IRQ 64-bit EL1
ventry . // FIQ 64-bit EL1
ventry . // Error 64-bit EL1
ventry __invalid // Synchronous 32-bit EL1
ventry __invalid // IRQ 32-bit EL1
ventry __invalid // FIQ 32-bit EL1
ventry __invalid // Error 32-bit EL1
__invalid:
b .
ventry . // Synchronous 32-bit EL1
ventry . // IRQ 32-bit EL1
ventry . // FIQ 32-bit EL1
ventry . // Error 32-bit EL1
/*
* Only uses x0..x3 so as to not clobber callee-saved SMCCC registers.
@ -76,6 +73,13 @@ __do_hyp_init:
eret
SYM_CODE_END(__kvm_hyp_init)
SYM_CODE_START_LOCAL(__kvm_init_el2_state)
/* Initialize EL2 CPU state to sane values. */
init_el2_state // Clobbers x0..x2
finalise_el2_state
ret
SYM_CODE_END(__kvm_init_el2_state)
/*
* Initialize the hypervisor in EL2.
*
@ -102,9 +106,12 @@ SYM_CODE_START_LOCAL(___kvm_hyp_init)
// TPIDR_EL2 is used to preserve x0 across the macro maze...
isb
msr tpidr_el2, x0
init_el2_state
finalise_el2_state
str lr, [x0, #NVHE_INIT_TMP]
bl __kvm_init_el2_state
mrs x0, tpidr_el2
ldr lr, [x0, #NVHE_INIT_TMP]
1:
ldr x1, [x0, #NVHE_INIT_TPIDR_EL2]
@ -199,9 +206,8 @@ SYM_CODE_START_LOCAL(__kvm_hyp_init_cpu)
2: msr SPsel, #1 // We want to use SP_EL{1,2}
/* Initialize EL2 CPU state to sane values. */
init_el2_state // Clobbers x0..x2
finalise_el2_state
bl __kvm_init_el2_state
__init_el2_nvhe_prepare_eret
/* Enable MMU, set vectors and stack. */

2
arch/arm64/kvm/sys_regs.c
View File

@ -1994,7 +1994,7 @@ static u64 reset_clidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
* one cache line.
*/
if (kvm_has_mte(vcpu->kvm))
clidr |= 2 << CLIDR_TTYPE_SHIFT(loc);
clidr |= 2ULL << CLIDR_TTYPE_SHIFT(loc);
__vcpu_sys_reg(vcpu, r->reg) = clidr;

13
arch/arm64/kvm/vgic/vgic-init.c
View File

@ -544,14 +544,23 @@ int kvm_vgic_map_resources(struct kvm *kvm)
if (ret)
goto out;
dist->ready = true;
dist_base = dist->vgic_dist_base;
mutex_unlock(&kvm->arch.config_lock);
ret = vgic_register_dist_iodev(kvm, dist_base, type);
if (ret)
if (ret) {
kvm_err("Unable to register VGIC dist MMIO regions\n");
goto out_slots;
}
/*
* kvm_io_bus_register_dev() guarantees all readers see the new MMIO
* registration before returning through synchronize_srcu(), which also
* implies a full memory barrier. As such, marking the distributor as
* 'ready' here is guaranteed to be ordered after all vCPUs having seen
* a completely configured distributor.
*/
dist->ready = true;
goto out_slots;
out:
mutex_unlock(&kvm->arch.config_lock);

7
arch/arm64/kvm/vgic/vgic-kvm-device.c
View File

@ -236,7 +236,12 @@ static int vgic_set_common_attr(struct kvm_device *dev,
mutex_lock(&dev->kvm->arch.config_lock);
if (vgic_ready(dev->kvm) || dev->kvm->arch.vgic.nr_spis)
/*
* Either userspace has already configured NR_IRQS or
* the vgic has already been initialized and vgic_init()
* supplied a default amount of SPIs.
*/
if (dev->kvm->arch.vgic.nr_spis)
ret = -EBUSY;
else
dev->kvm->arch.vgic.nr_spis =