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| author | Andrea Parri (Microsoft) <parri.andrea@gmail.com> | 2021-02-01 17:48:11 +0300 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2021-02-11 11:47:05 +0300 |
| commit | a6c76bb08dc7f7ff2b1c381002eb6c7211746182 (patch) | |
| tree | 9c86151283b8998c2cd26ccf1981d50c823cb555 /arch/x86/hyperv | |
| parent | bdb49526d25b076af4bd31b2fc66986ff0df1127 (diff) | |
| download | linux-a6c76bb08dc7f7ff2b1c381002eb6c7211746182.tar.xz | |
x86/hyperv: Load/save the Isolation Configuration leaf
If bit 22 of Group B Features is set, the guest has access to the
Isolation Configuration CPUID leaf. On x86, the first four bits
of EAX in this leaf provide the isolation type of the partition;
we entail three isolation types: 'SNP' (hardware-based isolation),
'VBS' (software-based isolation), and 'NONE' (no isolation).
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: x86@kernel.org
Cc: linux-arch@vger.kernel.org
Link: https://lore.kernel.org/r/20210201144814.2701-2-parri.andrea@gmail.com
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'arch/x86/hyperv')
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 6375967a8244..6608d50d7aaa 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -10,6 +10,7 @@ #include <linux/acpi.h> #include <linux/efi.h> #include <linux/types.h> +#include <linux/bitfield.h> #include <asm/apic.h> #include <asm/desc.h> #include <asm/hypervisor.h> @@ -555,3 +556,17 @@ bool hv_is_hibernation_supported(void) return acpi_sleep_state_supported(ACPI_STATE_S4); } EXPORT_SYMBOL_GPL(hv_is_hibernation_supported); + +enum hv_isolation_type hv_get_isolation_type(void) +{ + if (!(ms_hyperv.features_b & HV_ISOLATION)) + return HV_ISOLATION_TYPE_NONE; + return FIELD_GET(HV_ISOLATION_TYPE, ms_hyperv.isolation_config_b); +} +EXPORT_SYMBOL_GPL(hv_get_isolation_type); + +bool hv_is_isolation_supported(void) +{ + return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE; +} +EXPORT_SYMBOL_GPL(hv_is_isolation_supported); |