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arm64: Add ARM64_HAS_VIRT_HOST_EXTN feature 

Add a new ARM64_HAS_VIRT_HOST_EXTN features to indicate that the
CPU has the ARMv8.1 VHE capability.

This will be used to trigger kernel patching in KVM.

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2015-01-29 11:24:05 +00:00
parent f81f03fa23
commit d88701bea3
2 changed files with 16 additions and 1 deletions
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6
arch/arm64/include/asm/cpufeature.h
View File

@ -30,8 +30,12 @@
#define ARM64_HAS_LSE_ATOMICS 5
#define ARM64_WORKAROUND_CAVIUM_23154 6
#define ARM64_WORKAROUND_834220 7
/* #define ARM64_HAS_NO_HW_PREFETCH 8 */
/* #define ARM64_HAS_UAO 9 */
/* #define ARM64_ALT_PAN_NOT_UAO 10 */
#define ARM64_HAS_VIRT_HOST_EXTN 11
#define ARM64_NCAPS 8
#define ARM64_NCAPS 12
#ifndef __ASSEMBLY__

11
arch/arm64/kernel/cpufeature.c
View File

@ -26,6 +26,7 @@
#include <asm/cpu_ops.h>
#include <asm/processor.h>
#include <asm/sysreg.h>
#include <asm/virt.h>
unsigned long elf_hwcap __read_mostly;
EXPORT_SYMBOL_GPL(elf_hwcap);
@ -621,6 +622,11 @@ static bool has_useable_gicv3_cpuif(const struct arm64_cpu_capabilities *entry)
return has_sre;
}
static bool runs_at_el2(const struct arm64_cpu_capabilities *entry)
{
return is_kernel_in_hyp_mode();
}
static const struct arm64_cpu_capabilities arm64_features[] = {
{
.desc = "GIC system register CPU interface",
@ -651,6 +657,11 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.min_field_value = 2,
},
#endif /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
{
.desc = "Virtualization Host Extensions",
.capability = ARM64_HAS_VIRT_HOST_EXTN,
.matches = runs_at_el2,
},
{},
};