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-rw-r--r--virt/kvm/arm/vgic/vgic-its.c109
1 files changed, 65 insertions, 44 deletions
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 571b64a01c50..8d1da1af4b09 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -360,29 +360,6 @@ static int its_sync_lpi_pending_table(struct kvm_vcpu *vcpu)
return ret;
}
-static unsigned long vgic_mmio_read_its_ctlr(struct kvm *vcpu,
- struct vgic_its *its,
- gpa_t addr, unsigned int len)
-{
- u32 reg = 0;
-
- mutex_lock(&its->cmd_lock);
- if (its->creadr == its->cwriter)
- reg |= GITS_CTLR_QUIESCENT;
- if (its->enabled)
- reg |= GITS_CTLR_ENABLE;
- mutex_unlock(&its->cmd_lock);
-
- return reg;
-}
-
-static void vgic_mmio_write_its_ctlr(struct kvm *kvm, struct vgic_its *its,
- gpa_t addr, unsigned int len,
- unsigned long val)
-{
- its->enabled = !!(val & GITS_CTLR_ENABLE);
-}
-
static unsigned long vgic_mmio_read_its_typer(struct kvm *kvm,
struct vgic_its *its,
gpa_t addr, unsigned int len)
@@ -1161,33 +1138,16 @@ static void vgic_mmio_write_its_cbaser(struct kvm *kvm, struct vgic_its *its,
#define ITS_CMD_SIZE 32
#define ITS_CMD_OFFSET(reg) ((reg) & GENMASK(19, 5))
-/*
- * By writing to CWRITER the guest announces new commands to be processed.
- * To avoid any races in the first place, we take the its_cmd lock, which
- * protects our ring buffer variables, so that there is only one user
- * per ITS handling commands at a given time.
- */
-static void vgic_mmio_write_its_cwriter(struct kvm *kvm, struct vgic_its *its,
- gpa_t addr, unsigned int len,
- unsigned long val)
+/* Must be called with the cmd_lock held. */
+static void vgic_its_process_commands(struct kvm *kvm, struct vgic_its *its)
{
gpa_t cbaser;
u64 cmd_buf[4];
- u32 reg;
- if (!its)
- return;
-
- mutex_lock(&its->cmd_lock);
-
- reg = update_64bit_reg(its->cwriter, addr & 7, len, val);
- reg = ITS_CMD_OFFSET(reg);
- if (reg >= ITS_CMD_BUFFER_SIZE(its->cbaser)) {
- mutex_unlock(&its->cmd_lock);
+ /* Commands are only processed when the ITS is enabled. */
+ if (!its->enabled)
return;
- }
- its->cwriter = reg;
cbaser = CBASER_ADDRESS(its->cbaser);
while (its->cwriter != its->creadr) {
@@ -1207,6 +1167,34 @@ static void vgic_mmio_write_its_cwriter(struct kvm *kvm, struct vgic_its *its,
if (its->creadr == ITS_CMD_BUFFER_SIZE(its->cbaser))
its->creadr = 0;
}
+}
+
+/*
+ * By writing to CWRITER the guest announces new commands to be processed.
+ * To avoid any races in the first place, we take the its_cmd lock, which
+ * protects our ring buffer variables, so that there is only one user
+ * per ITS handling commands at a given time.
+ */
+static void vgic_mmio_write_its_cwriter(struct kvm *kvm, struct vgic_its *its,
+ gpa_t addr, unsigned int len,
+ unsigned long val)
+{
+ u64 reg;
+
+ if (!its)
+ return;
+
+ mutex_lock(&its->cmd_lock);
+
+ reg = update_64bit_reg(its->cwriter, addr & 7, len, val);
+ reg = ITS_CMD_OFFSET(reg);
+ if (reg >= ITS_CMD_BUFFER_SIZE(its->cbaser)) {
+ mutex_unlock(&its->cmd_lock);
+ return;
+ }
+ its->cwriter = reg;
+
+ vgic_its_process_commands(kvm, its);
mutex_unlock(&its->cmd_lock);
}
@@ -1287,6 +1275,39 @@ static void vgic_mmio_write_its_baser(struct kvm *kvm,
*regptr = reg;
}
+static unsigned long vgic_mmio_read_its_ctlr(struct kvm *vcpu,
+ struct vgic_its *its,
+ gpa_t addr, unsigned int len)
+{
+ u32 reg = 0;
+
+ mutex_lock(&its->cmd_lock);
+ if (its->creadr == its->cwriter)
+ reg |= GITS_CTLR_QUIESCENT;
+ if (its->enabled)
+ reg |= GITS_CTLR_ENABLE;
+ mutex_unlock(&its->cmd_lock);
+
+ return reg;
+}
+
+static void vgic_mmio_write_its_ctlr(struct kvm *kvm, struct vgic_its *its,
+ gpa_t addr, unsigned int len,
+ unsigned long val)
+{
+ mutex_lock(&its->cmd_lock);
+
+ its->enabled = !!(val & GITS_CTLR_ENABLE);
+
+ /*
+ * Try to process any pending commands. This function bails out early
+ * if the ITS is disabled or no commands have been queued.
+ */
+ vgic_its_process_commands(kvm, its);
+
+ mutex_unlock(&its->cmd_lock);
+}
+
#define REGISTER_ITS_DESC(off, rd, wr, length, acc) \
{ \
.reg_offset = off, \