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xen/arm: take the rank lock before accessing ipriority

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Currently we read ipriority from vgic_vcpu_inject_irq without taking the
rank lock. Fix that by taking the rank lock and reading ipriority at the
beginning of the function.

As vgic_vcpu_inject_irq is called from the irq.c upon receiving an
interrupt, we need to change the implementation of vgic_lock/unlock_rank
to spin_lock_irqsave to make it safe in irq context.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>
This commit is contained in:
Stefano Stabellini authored and Ian Campbell committed 2014-09-03 15:23:26 +01:00
1 parent 07892f7fa1
commit 446df2f733
3 files changed
+47 -42
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xen/arch/arm/vgic-v2.c
+38 -36
View File
@@ -39,6 +39,7 @@ static int vgic_v2_distr_mmio_read(struct vcpu *v, mmio_info_t *info)
register_t *r = select_user_reg(regs, dabt.reg);
struct vgic_irq_rank *rank;
int gicd_reg = (int)(info->gpa - v->domain->arch.vgic.dbase);
unsigned long flags;
switch ( gicd_reg )
{
@@ -77,54 +78,54 @@ static int vgic_v2_distr_mmio_read(struct vcpu *v, mmio_info_t *info)
if ( dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 1, gicd_reg - GICD_ISENABLER, DABT_WORD);
if ( rank == NULL) goto read_as_zero;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
*r = rank->ienable;
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_ICENABLER ... GICD_ICENABLERN:
if ( dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 1, gicd_reg - GICD_ICENABLER, DABT_WORD);
if ( rank == NULL) goto read_as_zero;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
*r = rank->ienable;
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_ISPENDR ... GICD_ISPENDRN:
if ( dabt.size != DABT_BYTE && dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 1, gicd_reg - GICD_ISPENDR, DABT_WORD);
if ( rank == NULL) goto read_as_zero;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
*r = vgic_byte_read(rank->ipend, dabt.sign, gicd_reg);
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_ICPENDR ... GICD_ICPENDRN:
if ( dabt.size != DABT_BYTE && dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 1, gicd_reg - GICD_ICPENDR, DABT_WORD);
if ( rank == NULL) goto read_as_zero;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
*r = vgic_byte_read(rank->ipend, dabt.sign, gicd_reg);
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_ISACTIVER ... GICD_ISACTIVERN:
if ( dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 1, gicd_reg - GICD_ISACTIVER, DABT_WORD);
if ( rank == NULL) goto read_as_zero;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
*r = rank->iactive;
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_ICACTIVER ... GICD_ICACTIVERN:
if ( dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 1, gicd_reg - GICD_ICACTIVER, DABT_WORD);
if ( rank == NULL) goto read_as_zero;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
*r = rank->iactive;
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_ITARGETSR ... GICD_ITARGETSRN:
@@ -132,12 +133,12 @@ static int vgic_v2_distr_mmio_read(struct vcpu *v, mmio_info_t *info)
rank = vgic_rank_offset(v, 8, gicd_reg - GICD_ITARGETSR, DABT_WORD);
if ( rank == NULL) goto read_as_zero;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
*r = rank->itargets[REG_RANK_INDEX(8, gicd_reg - GICD_ITARGETSR,
DABT_WORD)];
if ( dabt.size == DABT_BYTE )
*r = vgic_byte_read(*r, dabt.sign, gicd_reg);
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_IPRIORITYR ... GICD_IPRIORITYRN:
@@ -145,21 +146,21 @@ static int vgic_v2_distr_mmio_read(struct vcpu *v, mmio_info_t *info)
rank = vgic_rank_offset(v, 8, gicd_reg - GICD_IPRIORITYR, DABT_WORD);
if ( rank == NULL) goto read_as_zero;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
*r = rank->ipriority[REG_RANK_INDEX(8, gicd_reg - GICD_IPRIORITYR,
DABT_WORD)];
if ( dabt.size == DABT_BYTE )
*r = vgic_byte_read(*r, dabt.sign, gicd_reg);
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_ICFGR ... GICD_ICFGRN:
if ( dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 2, gicd_reg - GICD_ICFGR, DABT_WORD);
if ( rank == NULL) goto read_as_zero;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
*r = rank->icfg[REG_RANK_INDEX(2, gicd_reg - GICD_ICFGR, DABT_WORD)];
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_NSACR ... GICD_NSACRN:
@@ -176,18 +177,18 @@ static int vgic_v2_distr_mmio_read(struct vcpu *v, mmio_info_t *info)
if ( dabt.size != DABT_BYTE && dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 1, gicd_reg - GICD_CPENDSGIR, DABT_WORD);
if ( rank == NULL) goto read_as_zero;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
*r = vgic_byte_read(rank->pendsgi, dabt.sign, gicd_reg);
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_SPENDSGIR ... GICD_SPENDSGIRN:
if ( dabt.size != DABT_BYTE && dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 1, gicd_reg - GICD_SPENDSGIR, DABT_WORD);
if ( rank == NULL) goto read_as_zero;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
*r = vgic_byte_read(rank->pendsgi, dabt.sign, gicd_reg);
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
/* Implementation defined -- read as zero */
@@ -269,6 +270,7 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
struct vgic_irq_rank *rank;
int gicd_reg = (int)(info->gpa - v->domain->arch.vgic.dbase);
uint32_t tr;
unsigned long flags;
switch ( gicd_reg )
{
@@ -295,7 +297,7 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
if ( dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 1, gicd_reg - GICD_ISENABLER, DABT_WORD);
if ( rank == NULL) goto write_ignore;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
tr = rank->ienable;
rank->ienable |= *r;
/* The virtual irq is derived from register offset.
@@ -303,14 +305,14 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
* to get Virtual irq number */
vgic_enable_irqs(v, (*r) & (~tr),
(gicd_reg - GICD_ISENABLER) >> DABT_WORD);
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_ICENABLER ... GICD_ICENABLERN:
if ( dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 1, gicd_reg - GICD_ICENABLER, DABT_WORD);
if ( rank == NULL) goto write_ignore;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
tr = rank->ienable;
rank->ienable &= ~*r;
/* The virtual irq is derived from register offset.
@@ -318,7 +320,7 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
* to get Virtual irq number */
vgic_disable_irqs(v, (*r) & tr,
(gicd_reg - GICD_ICENABLER) >> DABT_WORD);
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_ISPENDR ... GICD_ISPENDRN:
@@ -337,18 +339,18 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
if ( dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 1, gicd_reg - GICD_ISACTIVER, DABT_WORD);
if ( rank == NULL) goto write_ignore;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
rank->iactive &= ~*r;
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_ICACTIVER ... GICD_ICACTIVERN:
if ( dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 1, gicd_reg - GICD_ICACTIVER, DABT_WORD);
if ( rank == NULL) goto write_ignore;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
rank->iactive &= ~*r;
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_ITARGETSR ... GICD_ITARGETSR + 7:
@@ -379,7 +381,7 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
!((target & 0xff) && (target & (0xff << 8)) &&
(target & (0xff << 16)) && (target & (0xff << 24))))
goto write_ignore;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
i = 0;
while ( (i = find_next_bit(&target, 32, i)) < 32 )
{
@@ -407,7 +409,7 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
else
vgic_byte_write(&rank->itargets[REG_RANK_INDEX(8,
gicd_reg - GICD_ITARGETSR, DABT_WORD)], target, gicd_reg);
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
}
@@ -415,14 +417,14 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
if ( dabt.size != DABT_BYTE && dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 8, gicd_reg - GICD_IPRIORITYR, DABT_WORD);
if ( rank == NULL) goto write_ignore;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
if ( dabt.size == DABT_WORD )
rank->ipriority[REG_RANK_INDEX(8, gicd_reg - GICD_IPRIORITYR,
DABT_WORD)] = *r;
else
vgic_byte_write(&rank->ipriority[REG_RANK_INDEX(8,
gicd_reg - GICD_IPRIORITYR, DABT_WORD)], *r, gicd_reg);
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_ICFGR: /* SGIs */
@@ -434,9 +436,9 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
if ( dabt.size != DABT_WORD ) goto bad_width;
rank = vgic_rank_offset(v, 2, gicd_reg - GICD_ICFGR, DABT_WORD);
if ( rank == NULL) goto write_ignore;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
rank->icfg[REG_RANK_INDEX(2, gicd_reg - GICD_ICFGR, DABT_WORD)] = *r;
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return 1;
case GICD_NSACR ... GICD_NSACRN:
xen/arch/arm/vgic.c
+7 -4
View File
@@ -158,10 +158,11 @@ struct vcpu *vgic_get_target_vcpu(struct vcpu *v, unsigned int irq)
struct domain *d = v->domain;
struct vcpu *v_target;
struct vgic_irq_rank *rank = vgic_rank_irq(v, irq);
unsigned long flags;
vgic_lock_rank(v, rank);
vgic_lock_rank(v, rank, flags);
v_target = d->arch.vgic.handler->get_target_vcpu(v, irq);
vgic_unlock_rank(v, rank);
vgic_unlock_rank(v, rank, flags);
return v_target;
}
@@ -368,6 +369,10 @@ void vgic_vcpu_inject_irq(struct vcpu *v, unsigned int irq)
unsigned long flags;
bool_t running;
vgic_lock_rank(v, rank, flags);
priority = vgic_byte_read(rank->ipriority[REG_RANK_INDEX(8, irq, DABT_WORD)], 0, irq & 0x3);
vgic_unlock_rank(v, rank, flags);
spin_lock_irqsave(&v->arch.vgic.lock, flags);
/* vcpu offline */
@@ -385,8 +390,6 @@ void vgic_vcpu_inject_irq(struct vcpu *v, unsigned int irq)
goto out;
}
priority = vgic_byte_read(rank->ipriority[REG_RANK_INDEX(8, irq, DABT_WORD)], 0, irq & 0x3);
n->irq = irq;
n->priority = priority;
xen/include/asm-arm/vgic.h
+2 -2
View File
@@ -107,8 +107,8 @@ struct vgic_ops {
#define vgic_lock(v) spin_lock_irq(&(v)->domain->arch.vgic.lock)
#define vgic_unlock(v) spin_unlock_irq(&(v)->domain->arch.vgic.lock)
#define vgic_lock_rank(v, r) spin_lock(&(r)->lock)
#define vgic_unlock_rank(v, r) spin_unlock(&(r)->lock)
#define vgic_lock_rank(v, r, flags) spin_lock_irqsave(&(r)->lock, flags)
#define vgic_unlock_rank(v, r, flags) spin_unlock_irqrestore(&(r)->lock, flags)
/*
* Rank containing GICD_<FOO><n> for GICD_<FOO> with
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