diff options
| author | Marc Zyngier <maz@kernel.org> | 2021-02-08 12:57:13 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-02-08 15:51:26 +0300 |
| commit | f359182291c757cdf77bcd014c025d1ed6b87662 (patch) | |
| tree | 88e93ba8771d6402f50b66cc0888543262f9870e /arch/arm64/include/asm/virt.h | |
| parent | 8cc8a32415364e475c25277b507f06f67c47ca9a (diff) | |
| download | linux-f359182291c757cdf77bcd014c025d1ed6b87662.tar.xz | |
arm64: Provide an 'upgrade to VHE' stub hypercall
As we are about to change the way a VHE system boots, let's
provide the core helper, in the form of a stub hypercall that
enables VHE and replicates the full EL1 context at EL2, thanks
to EL1 and VHE-EL2 being extremely similar.
On exception return, the kernel carries on at EL2. Fancy!
Nothing calls this new hypercall yet, so no functional change.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: David Brazdil <dbrazdil@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210208095732.3267263-5-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include/asm/virt.h')
| -rw-r--r-- | arch/arm64/include/asm/virt.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h index ee6a48df89d9..7379f35ae2c6 100644 --- a/arch/arm64/include/asm/virt.h +++ b/arch/arm64/include/asm/virt.h @@ -35,8 +35,13 @@ */ #define HVC_RESET_VECTORS 2 +/* + * HVC_VHE_RESTART - Upgrade the CPU from EL1 to EL2, if possible + */ +#define HVC_VHE_RESTART 3 + /* Max number of HYP stub hypercalls */ -#define HVC_STUB_HCALL_NR 3 +#define HVC_STUB_HCALL_NR 4 /* Error returned when an invalid stub number is passed into x0 */ #define HVC_STUB_ERR 0xbadca11 |