If the "etc/vmcoreinfo" fw_cfg file is present and we are not running the kdump kernel, write the addr/size of the vmcoreinfo ELF note. The DMA operation is expected to run synchronously with today qemu, but the specification states that it may become async, so we run "control" field check in a loop for eventual changes.
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| @@ -54,6 +54,7 @@ · 53 unmodified lines | |||
| 54 | 54 | ||
| 55 | /* FW_CFG_ID bits */ | 55 | /* FW_CFG_ID bits */ |
| 56 | #define FW_CFG_VERSION 0x01 | 56 | #define FW_CFG_VERSION 0x01 |
| 57 | #define FW_CFG_VERSION_DMA 0x02 | ||
| 57 | 58 | ||
| 58 | /* fw_cfg file directory entry type */ | 59 | /* fw_cfg file directory entry type */ |
| 59 | struct fw_cfg_file { | 60 | struct fw_cfg_file { |
| @@ -63,4 +64,34 @@ struct fw_cfg_file { · 3 unmodified lines | |||
| 63 | char name[FW_CFG_MAX_FILE_PATH]; | 64 | char name[FW_CFG_MAX_FILE_PATH]; |
| 64 | }; | 65 | }; |
| 65 | 66 | ||
| 67 | /* FW_CFG_DMA_CONTROL bits */ | ||
| 68 | #define FW_CFG_DMA_CTL_ERROR 0x01 | ||
| 69 | #define FW_CFG_DMA_CTL_READ 0x02 | ||
| 70 | #define FW_CFG_DMA_CTL_SKIP 0x04 | ||
| 71 | #define FW_CFG_DMA_CTL_SELECT 0x08 | ||
| 72 | #define FW_CFG_DMA_CTL_WRITE 0x10 | ||
| 73 | |||
| 74 | #define FW_CFG_DMA_SIGNATURE 0x51454d5520434647ULL /* "QEMU CFG" */ | ||
| 75 | |||
| 76 | /* Control as first field allows for different structures selected by this | ||
| 77 | * field, which might be useful in the future | ||
| 78 | */ | ||
| 79 | struct fw_cfg_dma_access { | ||
| 80 | __be32 control; | ||
| 81 | __be32 length; | ||
| 82 | __be64 address; | ||
| 83 | }; | ||
| 84 | |||
| 85 | #define FW_CFG_VMCOREINFO_FILENAME "etc/vmcoreinfo" | ||
| 86 | |||
| 87 | #define FW_CFG_VMCOREINFO_FORMAT_NONE 0x0 | ||
| 88 | #define FW_CFG_VMCOREINFO_FORMAT_ELF 0x1 | ||
| 89 | |||
| 90 | struct fw_cfg_vmcoreinfo { | ||
| 91 | __le16 host_format; | ||
| 92 | __le16 guest_format; | ||
| 93 | __le32 size; | ||
| 94 | __le64 paddr; | ||
| 95 | }; | ||
| 96 | |||
| 66 | #endif | 97 | #endif |