diff options
| author | Naman Jain <namjain@linux.microsoft.com> | 2025-01-16 06:12:24 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-10 14:39:30 +0200 |
| commit | e1fc76b2bbf36a687b1c060a421d3618326be15e (patch) | |
| tree | d6879906188ef1a042361e3986a0d9a12205e815 | |
| parent | ecc08c460866de7677e3656440b7d8a4bcae34be (diff) | |
x86/hyperv/vtl: Stop kernel from probing VTL0 low memory
[ Upstream commit 59115e2e25f42924181055ed7cc1d123af7598b7 ]
For Linux, running in Hyper-V VTL (Virtual Trust Level), kernel in VTL2
tries to access VTL0 low memory in probe_roms. This memory is not
described in the e820 map. Initialize probe_roms call to no-ops
during boot for VTL2 kernel to avoid this. The issue got identified
in OpenVMM which detects invalid accesses initiated from kernel running
in VTL2.
Co-developed-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Signed-off-by: Naman Jain <namjain@linux.microsoft.com>
Tested-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Roman Kisel <romank@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250116061224.1701-1-namjain@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250116061224.1701-1-namjain@linux.microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | arch/x86/hyperv/hv_vtl.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c index 04775346369c..d04ccd4b3b4a 100644 --- a/arch/x86/hyperv/hv_vtl.c +++ b/arch/x86/hyperv/hv_vtl.c @@ -30,6 +30,7 @@ void __init hv_vtl_init_platform(void) x86_platform.realmode_init = x86_init_noop; x86_init.irqs.pre_vector_init = x86_init_noop; x86_init.timers.timer_init = x86_init_noop; + x86_init.resources.probe_roms = x86_init_noop; /* Avoid searching for BIOS MP tables */ x86_init.mpparse.find_mptable = x86_init_noop; |