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| author | Marc Zyngier <maz@kernel.org> | 2023-06-09 19:21:52 +0300 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2023-06-13 02:17:23 +0300 |
| commit | 6f617d3aa643e4ed6929f5b582759f4a73804034 (patch) | |
| tree | e0e61c450a4f57e82f79913cf0ce302e59f166fe | |
| parent | 57e784b4079e9499ea1bafd56a0d422252aa2401 (diff) | |
| download | linux-6f617d3aa643e4ed6929f5b582759f4a73804034.tar.xz | |
KVM: arm64: Key use of VHE instructions in nVHE code off ARM64_KVM_HVHE
We can now start with the fun stuff: if we enable VHE *only* for
the hypervisor, we need to generate the VHE instructions when
accessing the system registers.
For this, reporpose the alternative sequence to be keyed off
ARM64_KVM_HVHE in the nVHE hypervisor code, and only there.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230609162200.2024064-10-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
| -rw-r--r-- | arch/arm64/include/asm/kvm_hyp.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h index fea04eb25cb4..b7238c72a04c 100644 --- a/arch/arm64/include/asm/kvm_hyp.h +++ b/arch/arm64/include/asm/kvm_hyp.h @@ -33,12 +33,18 @@ DECLARE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params); #else // !__KVM_VHE_HYPERVISOR__ +#if defined(__KVM_NVHE_HYPERVISOR__) +#define VHE_ALT_KEY ARM64_KVM_HVHE +#else +#define VHE_ALT_KEY ARM64_HAS_VIRT_HOST_EXTN +#endif + #define read_sysreg_elx(r,nvh,vh) \ ({ \ u64 reg; \ - asm volatile(ALTERNATIVE(__mrs_s("%0", r##nvh), \ + asm volatile(ALTERNATIVE(__mrs_s("%0", r##nvh), \ __mrs_s("%0", r##vh), \ - ARM64_HAS_VIRT_HOST_EXTN) \ + VHE_ALT_KEY) \ : "=r" (reg)); \ reg; \ }) @@ -48,7 +54,7 @@ DECLARE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params); u64 __val = (u64)(v); \ asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"), \ __msr_s(r##vh, "%x0"), \ - ARM64_HAS_VIRT_HOST_EXTN) \ + VHE_ALT_KEY) \ : : "rZ" (__val)); \ } while (0) |