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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [RFC PATCH V2 26/26] x86/vvtd: save and restore emulated VT-d
From: Chao Gao <chao.gao@xxxxxxxxx>
Wrap some useful status in a new structure hvm_hw_vvtd, following
the customs of vlapic, vioapic and etc. Provide two save-restore
pairs to save/restore registers and non-register status.
Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
xen/arch/x86/hvm/vvtd.c | 98 ++++++++++++++++++++++------------
xen/include/public/arch-x86/hvm/save.h | 24 ++++++++-
2 files changed, 88 insertions(+), 34 deletions(-)
diff --git a/xen/arch/x86/hvm/vvtd.c b/xen/arch/x86/hvm/vvtd.c
index ce25a77..e35bc9e 100644
--- a/xen/arch/x86/hvm/vvtd.c
+++ b/xen/arch/x86/hvm/vvtd.c
@@ -20,6 +20,7 @@
#include <xen/domain_page.h>
#include <xen/lib.h>
+#include <xen/hvm/save.h>
#include <xen/sched.h>
#include <xen/types.h>
#include <xen/viommu.h>
@@ -33,38 +34,25 @@
#include <asm/p2m.h>
#include <asm/system.h>
#include <public/viommu.h>
+#include <public/hvm/save.h>
#include "../../../drivers/passthrough/vtd/iommu.h"
#include "../../../drivers/passthrough/vtd/vtd.h"
-struct hvm_hw_vvtd_regs {
- uint8_t data[1024];
-};
-
/* Status field of struct vvtd */
#define VIOMMU_STATUS_IRQ_REMAPPING_ENABLED (1 << 0)
#define VIOMMU_STATUS_DMA_REMAPPING_ENABLED (1 << 1)
#define vvtd_irq_remapping_enabled(vvtd) \
- (vvtd->status & VIOMMU_STATUS_IRQ_REMAPPING_ENABLED)
+ (vvtd->hw.status & VIOMMU_STATUS_IRQ_REMAPPING_ENABLED)
struct vvtd {
- /* VIOMMU_STATUS_XXX_REMAPPING_ENABLED */
- int status;
- /* Fault Recording index */
- int frcd_idx;
/* Address range of remapping hardware register-set */
uint64_t base_addr;
uint64_t length;
/* Point back to the owner domain */
struct domain *domain;
- /* Is in Extended Interrupt Mode? */
- bool eim;
- /* Max remapping entries in IRT */
- int irt_max_entry;
- /* Interrupt remapping table base gfn */
- uint64_t irt;
-
+ struct hvm_hw_vvtd hw;
struct hvm_hw_vvtd_regs *regs;
struct page_info *regs_page;
};
@@ -369,12 +357,12 @@ static int vvtd_alloc_frcd(struct vvtd *vvtd)
{
int prev;
/* Set the F bit to indicate the FRCD is in use. */
- if ( vvtd_test_and_set_bit(vvtd, DMA_FRCD(vvtd->frcd_idx,
DMA_FRCD3_OFFSET),
+ if ( vvtd_test_and_set_bit(vvtd, DMA_FRCD(vvtd->hw.frcd_idx,
DMA_FRCD3_OFFSET),
DMA_FRCD_F_BIT) )
{
- prev = vvtd->frcd_idx;
- vvtd->frcd_idx = (prev + 1) % DMAR_FRCD_REG_NR;
- return vvtd->frcd_idx;
+ prev = vvtd->hw.frcd_idx;
+ vvtd->hw.frcd_idx = (prev + 1) % DMAR_FRCD_REG_NR;
+ return vvtd->hw.frcd_idx;
}
return -1;
}
@@ -706,12 +694,12 @@ static int vvtd_handle_gcmd_ire(struct vvtd *vvtd,
uint32_t val)
if ( val & DMA_GCMD_IRE )
{
- vvtd->status |= VIOMMU_STATUS_IRQ_REMAPPING_ENABLED;
+ vvtd->hw.status |= VIOMMU_STATUS_IRQ_REMAPPING_ENABLED;
__vvtd_set_bit(vvtd, DMAR_GSTS_REG, DMA_GSTS_IRES_BIT);
}
else
{
- vvtd->status |= ~VIOMMU_STATUS_IRQ_REMAPPING_ENABLED;
+ vvtd->hw.status |= ~VIOMMU_STATUS_IRQ_REMAPPING_ENABLED;
__vvtd_clear_bit(vvtd, DMAR_GSTS_REG, DMA_GSTS_IRES_BIT);
}
@@ -730,11 +718,11 @@ static int vvtd_handle_gcmd_sirtp(struct vvtd *vvtd,
uint32_t val)
"active." );
vvtd_get_reg_quad(vvtd, DMAR_IRTA_REG, irta);
- vvtd->irt = DMA_IRTA_ADDR(irta) >> PAGE_SHIFT;
- vvtd->irt_max_entry = DMA_IRTA_SIZE(irta);
- vvtd->eim = DMA_IRTA_EIME(irta);
+ vvtd->hw.irt = DMA_IRTA_ADDR(irta) >> PAGE_SHIFT;
+ vvtd->hw.irt_max_entry = DMA_IRTA_SIZE(irta);
+ vvtd->hw.eim = DMA_IRTA_EIME(irta);
VVTD_DEBUG(VVTD_DBG_RW, "Update IR info (addr=%lx eim=%d size=%d).",
- vvtd->irt, vvtd->eim, vvtd->irt_max_entry);
+ vvtd->hw.irt, vvtd->hw.eim, vvtd->hw.irt_max_entry);
__vvtd_set_bit(vvtd, DMAR_GSTS_REG, DMA_GSTS_SIRTPS_BIT);
return X86EMUL_OKAY;
@@ -953,13 +941,13 @@ static int vvtd_get_entry(struct vvtd *vvtd,
VVTD_DEBUG(VVTD_DBG_TRANS, "interpret a request with index %x", entry);
- if ( entry > vvtd->irt_max_entry )
+ if ( entry > vvtd->hw.irt_max_entry )
{
ret = VTD_FR_IR_INDEX_OVER;
goto handle_fault;
}
- ret = map_guest_page(vvtd->domain, vvtd->irt + (entry >>
IREMAP_ENTRY_ORDER),
+ ret = map_guest_page(vvtd->domain, vvtd->hw.irt + (entry >>
IREMAP_ENTRY_ORDER),
(void**)&irt_page);
if ( ret )
{
@@ -1084,6 +1072,49 @@ static int vvtd_get_irq_info(struct domain *d,
return 0;
}
+static int vvtd_load_regs(struct domain *d, hvm_domain_context_t *h)
+{
+ if ( !domain_vvtd(d) )
+ return -ENODEV;
+
+ if ( hvm_load_entry(IOMMU_REGS, h, domain_vvtd(d)->regs) )
+ return -EINVAL;
+
+ return 0;
+}
+
+static int vvtd_save_regs(struct domain *d, hvm_domain_context_t *h)
+{
+ if ( !domain_vvtd(d) )
+ return 0;
+
+ return hvm_save_entry(IOMMU_REGS, 0, h, domain_vvtd(d)->regs);
+}
+
+static int vvtd_load_hidden(struct domain *d, hvm_domain_context_t *h)
+{
+ if ( !domain_vvtd(d) )
+ return -ENODEV;
+
+ if ( hvm_load_entry(IOMMU, h, &domain_vvtd(d)->hw) )
+ return -EINVAL;
+
+ return 0;
+}
+
+static int vvtd_save_hidden(struct domain *d, hvm_domain_context_t *h)
+{
+ if ( !domain_vvtd(d) )
+ return 0;
+
+ return hvm_save_entry(IOMMU, 0, h, &domain_vvtd(d)->hw);
+}
+
+HVM_REGISTER_SAVE_RESTORE(IOMMU, vvtd_save_hidden, vvtd_load_hidden,
+ 1, HVMSR_PER_DOM);
+HVM_REGISTER_SAVE_RESTORE(IOMMU_REGS, vvtd_save_regs, vvtd_load_regs,
+ 1, HVMSR_PER_DOM);
+
static void vvtd_reset(struct vvtd *vvtd, uint64_t capability)
{
uint64_t cap, ecap;
@@ -1147,12 +1178,13 @@ static int vvtd_create(struct domain *d, struct viommu
*viommu)
vvtd->base_addr = viommu->base_address;
vvtd->length = viommu->length;
vvtd->domain = d;
- vvtd->status = 0;
- vvtd->eim = 0;
- vvtd->irt = 0;
- vvtd->irt_max_entry = 0;
- vvtd->frcd_idx = 0;
+ vvtd->hw.status = 0;
+ vvtd->hw.eim = 0;
+ vvtd->hw.irt = 0;
+ vvtd->hw.irt_max_entry = 0;
+ vvtd->hw.frcd_idx = 0;
register_mmio_handler(d, &vvtd_mmio_ops);
+ viommu->priv = (void *)vvtd;
return 0;
out2:
diff --git a/xen/include/public/arch-x86/hvm/save.h
b/xen/include/public/arch-x86/hvm/save.h
index 816973b..28fafc8 100644
--- a/xen/include/public/arch-x86/hvm/save.h
+++ b/xen/include/public/arch-x86/hvm/save.h
@@ -638,10 +638,32 @@ struct hvm_msr {
#define CPU_MSR_CODE 20
+struct hvm_hw_vvtd_regs {
+ uint8_t data[1024];
+};
+
+DECLARE_HVM_SAVE_TYPE(IOMMU_REGS, 21, struct hvm_hw_vvtd_regs);
+
+struct hvm_hw_vvtd
+{
+ /* VIOMMU_STATUS_XXX_REMAPPING_ENABLED */
+ uint32_t status;
+ /* Fault Recording index */
+ uint32_t frcd_idx;
+ /* Is in Extended Interrupt Mode? */
+ uint32_t eim;
+ /* Max remapping entries in IRT */
+ uint32_t irt_max_entry;
+ /* Interrupt remapping table base gfn */
+ uint64_t irt;
+};
+
+DECLARE_HVM_SAVE_TYPE(IOMMU, 22, struct hvm_hw_vvtd);
+
/*
* Largest type-code in use
*/
-#define HVM_SAVE_CODE_MAX 20
+#define HVM_SAVE_CODE_MAX 22
#endif /* __XEN_PUBLIC_HVM_SAVE_X86_H__ */
--
1.8.3.1
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