Hello,

With current edk2/master booting AMD SEV-ES guest with OvmfPkgX64 package is failing with below error:

[    0.240243] Memory Encryption Features active: AMD SEV SEV-ES
[    0.241170] SEV: Status: SEV SEV-ES
[    0.241783] pid_max: default: 32768 minimum: 301
[    0.243627] BUG: unable to handle page fault for address: 000000007f6e1331
[    0.243629] #PF: supervisor instruction fetch in kernel mode
[    0.243630] #PF: error_code(0x0010) - not-present page
[    0.243631] PGD 8000001933063 P4D 8000001933063 PUD 8000001934063 PMD 8000001938063 PTE 800007f6e1063
[    0.243635] Oops: Oops: 0010 [#1] PREEMPT SMP NOPTI
[    0.243637] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.2-7aa21fec18-11cb77746de #1
[    0.243640] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022
[    0.243641] RIP: 0010:0x7f6e1331
[    0.243643] Code: Unable to access opcode bytes at 0x7f6e1307.
[    0.243643] RSP: 0000:ffffffff96403b80 EFLAGS: 00010097 ORIG_RAX: 0000000000000010
[    0.243645] RAX: 0000000000000001 RBX: ffffffff96403c40 RCX: ffffffff96403c40
[    0.243646] RDX: 00000000000003fd RSI: ffffffff96403d40 RDI: 0000000000000001
[    0.243647] RBP: ffffffff96403c00 R08: 0000000000000001 R09: 000000007f6e2c74
[    0.243648] R10: 0000000000000002 R11: 0000000000000000 R12: 000000000000001f
[    0.243649] R13: ffffffff96403c5f R14: 00000000000003fd R15: ffffffff96403bb8
[    0.243650] FS: 0000000000000000(0000) GS:ffff933b3cc00000(0000) knlGS:0000000000000000
[    0.243652] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.243653] CR2: 000000007f6e1331 CR3: 000800000196e000 CR4: 00000000003506f0
[    0.243655] Call Trace:
[    0.243656] <TASK>
[    0.243657] ? __die+0x1b/0x60
[    0.243662] ? page_fault_oops+0x151/0x4d0
[    0.243667] ? exc_page_fault+0x64/0x140
[    0.243670] ? vc_raw_handle_exception+0x287/0x2c0
[    0.243676] ? kernel_exc_vmm_communication+0x4d/0x100
[    0.243679] ? asm_exc_vmm_communication+0x31/0x70
[    0.243685] ? __alloc_pages_noprof+0x162/0x300
[    0.243691] ? __cpa_process_fault+0x463/0x6f0
[    0.243698] ? srso_return_thunk+0x5/0x5f
[    0.243701] ? __efi_call+0x28/0x30
[    0.243705] ? srso_return_thunk+0x5/0x5f
[    0.243706] ? efi_set_virtual_address_map+0x95/0x1e0
[    0.243710] ? sev_es_efi_map_ghcbs+0x8c/0xd0
[    0.243714] ? efi_enter_virtual_mode+0x391/0x470
[    0.243718] ? start_kernel+0x457/0x750
[    0.243720] ? x86_64_start_reservations+0x14/0x30
[    0.243722] ? x86_64_start_kernel+0xce/0xe0
[    0.243723] ? common_startup_64+0x13e/0x141
[    0.243727] </TASK>
[    0.243728] Modules linked in:
[    0.243730] CR2: 000000007f6e1331
[    0.243731] ---[ end trace 0000000000000000 ]---
[    0.243732] RIP: 0010:0x7f6e1331
[    0.243733] Code: Unable to access opcode bytes at 0x7f6e1307.
[    0.243734] RSP: 0000:ffffffff96403b80 EFLAGS: 00010097 ORIG_RAX: 0000000000000010
[    0.243735] RAX: 0000000000000001 RBX: ffffffff96403c40 RCX: ffffffff96403c40
[    0.243736] RDX: 00000000000003fd RSI: ffffffff96403d40 RDI: 0000000000000001
[    0.243737] RBP: ffffffff96403c00 R08: 0000000000000001 R09: 000000007f6e2c74
[    0.243738] R10: 0000000000000002 R11: 0000000000000000 R12: 000000000000001f
[    0.243739] R13: ffffffff96403c5f R14: 00000000000003fd R15: ffffffff96403bb8
[    0.243740] FS: 0000000000000000(0000) GS:ffff933b3cc00000(0000) knlGS:0000000000000000
[    0.243741] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.243742] CR2: 000000007f6e1331 CR3: 000800000196e000 CR4: 00000000003506f0
[    0.243744] Kernel panic - not syncing: Fatal exception in interrupt
[    0.244168] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---

I did git bisect which points to below commit.

commit aedcaa3df8a246ef859c234ed5c243471c5be698

Author: INDIA\sachinganesh <sachinganesh@ami.com>

Date: Mon Jan 13 16:15:54 2025 +0530

MdePkg: Fix overflow issue in PeCoffLoaderRelocateImageForRuntime

RelocDir->Size is a UINT32 value, and RelocDir->VirtualAddress is

also a UINT32 value. The current code in

PeCoffLoaderRelocateImageForRuntime does not check for overflow when

adding RelocDir->Size to RelocDir->VirtualAddress. This patch uses

SafeIntLib to ensure that the addition does not overflow.

Signed-off-by: Sachin Ganesh <sachinganesh@ami.com>

MdePkg/Library/BasePeCoffLib/BasePeCoff.c | 25 +++++++++++++------------

MdePkg/Library/BasePeCoffLib/BasePeCoffLib.inf | 1 +

2 files changed, 14 insertions(+), 12 deletions(-)

Sample qemu command line which I used:

qemu-system-x86_64 \
-machine q35,confidential-guest-support=sev0,vmport=off \
-object sev-guest,id=sev0,policy=0x5,cbitpos=51,reduced-phys-bits=1 \
-name guest=vm,debug-threads=on \
-drive if=pflash,format=raw,unit=0,file=OVMF_X64/OVMF.fd,readonly \
-cpu EPYC-v4 \
-m 2048 \
-smp 255,maxcpus=255,cores=255,threads=1,dies=1,sockets=1 \
-kernel bzImage \
-append "root=/dev/sda rw console=ttyS0 net.ifnames=0 biosdevname=0 movable_node swiotlb=65536 " \
-drive id=disk0,file=22.04-server_seves.qcow2,if=none \
-device virtio-scsi-pci,id=scsi0,disable-legacy=on,iommu_platform=true \
-device scsi-hd,drive=disk0 \
--enable-kvm \
--nographic

Thank you,

Srikanth Aithal <sraithal@amd.com>

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