Introduce new IOMMU commands for vIOMMU for resetting
virtualized MMIO registers of a particular guest.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
---
drivers/iommu/amd/amd_iommu_types.h | 1 +
drivers/iommu/amd/iommu.c | 22 ++++++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index d832e0c36a21..aa16a7079b5c 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -200,6 +200,7 @@
#define CMD_INV_IRT 0x05
#define CMD_COMPLETE_PPR 0x07
#define CMD_INV_ALL 0x08
+#define CMD_RESET_VMMIO 0x0A
#define CMD_COMPL_WAIT_STORE_MASK 0x01
#define CMD_COMPL_WAIT_INT_MASK 0x02
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index efced59ba8a5..b5c62bc8249c 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -1133,6 +1133,18 @@ static void build_inv_irt(struct iommu_cmd *cmd, u16 devid)
CMD_SET_TYPE(cmd, CMD_INV_IRT);
}
+static void build_reset_vmmio(struct iommu_cmd *cmd, u16 guestId,
+ bool vcmd, bool all)
+{
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->data[0] = guestId;
+ if (all)
+ cmd->data[0] |= (1 << 28);
+ if (vcmd)
+ cmd->data[0] |= (1 << 31);
+ CMD_SET_TYPE(cmd, CMD_RESET_VMMIO);
+}
+
/*
* Writes the command to the IOMMUs command buffer and informs the
* hardware about the new command.
@@ -1315,6 +1327,16 @@ void iommu_flush_all_caches(struct amd_iommu *iommu)
}
}
+void iommu_reset_vmmio(struct amd_iommu *iommu, u16 guestId)
+{
+ struct iommu_cmd cmd;
+
+ build_reset_vmmio(&cmd, guestId, 1, 1);
+
+ iommu_queue_command(iommu, &cmd);
+ iommu_completion_wait(iommu);
+}
+
/*
* Command send function for flushing on-device TLB
*/
--
2.34.1
