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hv:enable GVT-d for pre-launched linux guest in logical partion mode

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When pass-thru GPU to pre-launched Linux guest,
need to pass GPU OpRegion to the guest.
Here's the detailed steps:
1. reserve a memory region in ve820 table for GPU OpRegion
2. build EPT mapping for GPU OpRegion to pass-thru OpRegion to guest
3. emulate the pci config register for OpRegion
For the third step, here's detailed description:
The address of OpRegion locates on PCI config space offset 0xFC,
Normal Linux guest won't write this register,
so we can regard this register as read-only.
When guest reads this register, return the emulated value.
When guest writes this register, ignore the operation.

Tracked-On: #6387

Signed-off-by: Liu,Junming <junming.liu@intel.com>
This commit is contained in:
Liu,Junming
2021-08-12 09:30:05 +00:00
committed by wenlingz
parent 1dca1da96d
commit 2c5c8754de
4 changed files with 49 additions and 6 deletions
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14
hypervisor/arch/x86/guest/ve820.c
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@@ -12,10 +12,11 @@
#include <vacpi.h>
#include <logmsg.h>
#include <asm/rtcm.h>
#include <ptdev.h>
#define ENTRY_HPA1_LOW_PART1 2U
#define ENTRY_HPA1_LOW_PART2 4U
#define ENTRY_HPA1_HI 8U
#define ENTRY_HPA1_LOW_PART2 5U
#define ENTRY_HPA1_HI 9U
static struct e820_entry sos_vm_e820[E820_MAX_ENTRIES];
static struct e820_entry pre_vm_e820[PRE_VM_NUM][E820_MAX_ENTRIES];
@@ -197,9 +198,14 @@ static const struct e820_entry pre_ve820_template[E820_MAX_ENTRIES] = {
.length = PRE_RTVM_SW_SRAM_MAX_SIZE,
.type = E820_TYPE_RESERVED
},
{ /* GPU OpRegion for pre-launched VM */
.baseaddr = GPU_OPREGION_GPA,
.length = GPU_OPREGION_SIZE,
.type = E820_TYPE_RESERVED
},
{ /* part2 of lowmem of hpa1*/
.baseaddr = PRE_RTVM_SW_SRAM_BASE_GPA + PRE_RTVM_SW_SRAM_MAX_SIZE,
.length = VIRT_ACPI_DATA_ADDR - (PRE_RTVM_SW_SRAM_BASE_GPA + PRE_RTVM_SW_SRAM_MAX_SIZE),
.baseaddr = GPU_OPREGION_GPA + GPU_OPREGION_SIZE,
.length = VIRT_ACPI_DATA_ADDR - (GPU_OPREGION_GPA + GPU_OPREGION_SIZE),
.type = E820_TYPE_RAM
},
{ /* ACPI Reclaim */