On 2021/5/11 0:58, Marc Zyngier wrote:
From: Jintack Lim <[email protected]>
Add a new ARM64_HAS_NESTED_VIRT feature to indicate that the
CPU has the ARMv8.3 nested virtualization capability.
This will be used to support nested virtualization in KVM.
Signed-off-by: Jintack Lim <[email protected]>
Signed-off-by: Andre Przywara <[email protected]>
Signed-off-by: Christoffer Dall <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
---
.../admin-guide/kernel-parameters.txt | 4 +++
arch/arm64/include/asm/cpucaps.h | 1 +
arch/arm64/kernel/cpufeature.c | 25 +++++++++++++++++++
3 files changed, 30 insertions(+)
[...]
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index efed2830d141..056de86d7f6f 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1645,6 +1645,21 @@ static void cpu_copy_el2regs(const struct
arm64_cpu_capabilities *__unused)
write_sysreg(read_sysreg(tpidr_el1), tpidr_el2);
}
+static bool nested_param;
+static bool has_nested_virt_support(const struct arm64_cpu_capabilities *cap,
+ int scope)
+{
+ return has_cpuid_feature(cap, scope) &&
+ nested_param;
+}
Nitpick:
How about putting them into a single line (they still perfectly
fit within the 80-colume limit)?
Zenghui
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