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author | Dexuan Cui <decui@microsoft.com> | 2023-08-24 11:07:10 +0300 |
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committer | Wei Liu <wei.liu@kernel.org> | 2023-08-25 03:04:57 +0300 |
commit | b9b4fe3a72b60c8d74a9ffb61aa778f04eaddd87 (patch) | |
tree | 85b3853e1490683d3f814092b5b8acd7e87e5374 /drivers/hv/hv.c | |
parent | 23378295042a4bcaeec350733a4771678e7a1f3a (diff) | |
download | linux-b9b4fe3a72b60c8d74a9ffb61aa778f04eaddd87.tar.xz |
x86/hyperv: Use TDX GHCI to access some MSRs in a TDX VM with the paravisor
When the paravisor is present, a SNP VM must use GHCB to access some
special MSRs, including HV_X64_MSR_GUEST_OS_ID and some SynIC MSRs.
Similarly, when the paravisor is present, a TDX VM must use TDX GHCI
to access the same MSRs.
Implement hv_tdx_msr_write() and hv_tdx_msr_read(), and use the helper
functions hv_ivm_msr_read() and hv_ivm_msr_write() to access the MSRs
in a unified way for SNP/TDX VMs with the paravisor.
Do not export hv_tdx_msr_write() and hv_tdx_msr_read(), because we never
really used hv_ghcb_msr_write() and hv_ghcb_msr_read() in any module.
Update arch/x86/include/asm/mshyperv.h so that the kernel can still build
if CONFIG_AMD_MEM_ENCRYPT or CONFIG_INTEL_TDX_GUEST is not set, or
neither is set.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Link: https://lore.kernel.org/r/20230824080712.30327-9-decui@microsoft.com
Diffstat (limited to 'drivers/hv/hv.c')
0 files changed, 0 insertions, 0 deletions