Skip to content

msr range check removal #645

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
NotRequiem merged 2 commits into from
Feb 27, 2026
Merged

msr range check removal #645

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
9957676
remove: msr range checks for hv brands
Feb 27, 2026
160cd79
Merge branch 'kernelwernel:main' into main
NotRequiem Feb 27, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
29 changes: 0 additions & 29 deletions src/vmaware.hpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -11283,15 +11283,6 @@ struct VM {
#endif
constexpr u32 random_msr = 0xDEADBEEFu;

struct range {
u32 start;
u32 end;
};
static constexpr range ranges[] = {
{ 0x40000000u, 0x400000FFu },
{ 0x4B564D00u, 0x4B564DFFu }
};

auto try_read = [](u32 msr_index) -> bool {
#if (MSVC)
unsigned __int64 value = 0;
Expand Down Expand Up @@ -11339,26 +11330,6 @@ struct VM {
debug("MSR: Detected hypervisor not correctly handling #GP");
return true;
}
for (size_t r = 0; r < (sizeof(ranges) / sizeof(ranges[0])); ++r) {
const u32 s = ranges[r].start;
const u32 e = ranges[r].end;
for (u32 i = s; i != e + 1u; ++i) {
if (try_read(i)) {
if (s == 0x40000000u && e == 0x400000FFu) {
debug("MSR: Detected Hyper-V VM");
return core::add(brands::HYPERV);
}
else if (s == 0x4B564D00u && e == 0x4B564DFFu) {
debug("MSR: Detected KVM");
return core::add(brands::KVM);
}
else {
debug("MSR: Detected readable MSR index: 0x", std::hex, i, std::dec, '\n');
return true;
}
}
}
}

return false;
}
Expand Down
Loading