[Xen-devel] [RFC PATCH 16/23] X86/vvtd: Enable Queued Invalidation through GCMD

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

From: Chao Gao <chao.gao@xxxxxxxxx>

Software writes to QIE fields of GCMD to enable or disable queued
invalidations. This patch emulates QIE fields of GCMD.

Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 xen/arch/x86/hvm/vvtd.c             | 18 ++++++++++++++++++
 xen/drivers/passthrough/vtd/iommu.h |  3 ++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vvtd.c b/xen/arch/x86/hvm/vvtd.c
index 0c49294..ba4d585 100644
--- a/xen/arch/x86/hvm/vvtd.c
+++ b/xen/arch/x86/hvm/vvtd.c
@@ -100,6 +100,11 @@ static inline void __vvtd_set_bit(struct vvtd *vvtd, 
uint32_t reg, int nr)
     return __set_bit(nr, (uint32_t *)&vvtd->regs->data[reg]);
 }
 
+static inline void __vvtd_clear_bit(struct vvtd *vvtd, uint32_t reg, int nr)
+{
+    return __clear_bit(nr, (uint32_t *)&vvtd->regs->data[reg]);
+}
+
 static inline void vvtd_set_reg(struct vvtd *vtd, uint32_t reg,
                                 uint32_t value)
 {
@@ -258,6 +263,17 @@ static int vvtd_log_fault(struct vvtd *vvtd, struct 
irq_remapping_request *irq,
     return 0;
 }
 
+static int vvtd_handle_gcmd_qie(struct vvtd *vvtd, unsigned long val)
+{
+    VVTD_DEBUG(VVTD_DBG_RW, "Enable Queue Invalidation.");
+
+    if ( val & DMA_GCMD_QIE )
+        __vvtd_set_bit(vvtd, DMAR_GSTS_REG, DMA_GSTS_QIES_BIT);
+    else
+        __vvtd_clear_bit(vvtd, DMAR_GSTS_REG, DMA_GSTS_QIES_BIT);
+    return X86EMUL_OKAY;
+}
+
 static int vvtd_handle_gcmd_sirtp(struct vvtd *vvtd, unsigned long val)
 {
     uint64_t irta;
@@ -289,6 +305,8 @@ static int vvtd_write_gcmd(struct vvtd *vvtd, unsigned long 
val)
 
     if ( changed & DMA_GCMD_SIRTP )
         vvtd_handle_gcmd_sirtp(vvtd, val);
+    if ( changed & DMA_GCMD_QIE )
+        vvtd_handle_gcmd_qie(vvtd, val);
 
     return X86EMUL_OKAY;
 }
diff --git a/xen/drivers/passthrough/vtd/iommu.h 
b/xen/drivers/passthrough/vtd/iommu.h
index aa1f1a6..dd38c39 100644
--- a/xen/drivers/passthrough/vtd/iommu.h
+++ b/xen/drivers/passthrough/vtd/iommu.h
@@ -193,7 +193,8 @@
 #define DMA_GSTS_FLS    (((u64)1) << 29)
 #define DMA_GSTS_AFLS   (((u64)1) << 28)
 #define DMA_GSTS_WBFS   (((u64)1) << 27)
-#define DMA_GSTS_QIES   (((u64)1) <<26)
+#define DMA_GSTS_QIES_BIT       26
+#define DMA_GSTS_QIES           (((u64)1) << DMA_GSTS_QIES_BIT)
 #define DMA_GSTS_IRES   (((u64)1) <<25)
 #define DMA_GSTS_SIRTPS_BIT     24
 #define DMA_GSTS_SIRTPS (((u64)1) << DMA_GSTS_SIRTPS_BIT)
-- 
1.8.3.1


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