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[Xen-devel] MSR IA32_MISC_ENABLE missing on AMD (OVMF use it now)
Hi,
Recently, OVMF start to read MSR 0x1a0, which cause a General Protection
fault on AMD, but not in Intel. OMVF does not handle it and crash.
OVMF use msr 0x1a0, which seems to be IA32_MISC_ENABLE, to find out if
the XD attribute can be use on page tables.
From a recent run (OVMF output):
http://logs.test-lab.xenproject.org/osstest/logs/106538/test-amd64-amd64-xl-qemuu-ovmf-amd64/rimava0---var-log-xen-osstest-serial-debianhvm.guest.osstest.log
This is where the read is made:
https://github.com/tianocore/edk2/blob/master/UefiCpuPkg/CpuDxe/CpuPageTable.c#L196
It was first introduced in this commit:
"UefiCpuPkg/CpuDxe: Add memory attribute setting."
https://github.com/tianocore/edk2/commit/22292ed344b8512c838bdd162533198b51a51c0c
Is this a missing feature in Xen or a bug in OVMF?
Regards,
--
Anthony PERARD
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