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| author | Paolo Bonzini <pbonzini@redhat.com> | 2021-01-28 13:02:49 -0500 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-01-28 13:02:49 -0500 |
| commit | 074489b77a37c61c0b090d63b2731a951064fd70 (patch) | |
| tree | 264d7eb8b4c263ddaaf49dfea362536644d94f40 | |
| parent | 181f494888d5b178ffda41bed965f187d5e5c432 (diff) | |
| parent | e500b805c39daff2670494fff94909d7e3d094d9 (diff) | |
| download | powerpc-074489b77a37c61c0b090d63b2731a951064fd70.tar.gz | |
Merge tag 'kvmarm-fixes-5.11-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD
KVM/arm64 fixes for 5.11, take #3
- Avoid clobbering extra registers on initialisation
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/hyp-init.S | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S index 31b060a4404524..b17bf19217f110 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-init.S +++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S @@ -47,6 +47,8 @@ __invalid: b . /* + * Only uses x0..x3 so as to not clobber callee-saved SMCCC registers. + * * x0: SMCCC function ID * x1: struct kvm_nvhe_init_params PA */ @@ -70,9 +72,9 @@ __do_hyp_init: eret 1: mov x0, x1 - mov x4, lr - bl ___kvm_hyp_init - mov lr, x4 + mov x3, lr + bl ___kvm_hyp_init // Clobbers x0..x2 + mov lr, x3 /* Hello, World! */ mov x0, #SMCCC_RET_SUCCESS @@ -82,8 +84,8 @@ SYM_CODE_END(__kvm_hyp_init) /* * Initialize the hypervisor in EL2. * - * Only uses x0..x3 so as to not clobber callee-saved SMCCC registers - * and leave x4 for the caller. + * Only uses x0..x2 so as to not clobber callee-saved SMCCC registers + * and leave x3 for the caller. * * x0: struct kvm_nvhe_init_params PA */ @@ -112,9 +114,9 @@ alternative_else_nop_endif /* * Set the PS bits in TCR_EL2. */ - ldr x1, [x0, #NVHE_INIT_TCR_EL2] - tcr_compute_pa_size x1, #TCR_EL2_PS_SHIFT, x2, x3 - msr tcr_el2, x1 + ldr x0, [x0, #NVHE_INIT_TCR_EL2] + tcr_compute_pa_size x0, #TCR_EL2_PS_SHIFT, x1, x2 + msr tcr_el2, x0 isb @@ -193,7 +195,7 @@ SYM_CODE_START_LOCAL(__kvm_hyp_init_cpu) /* Enable MMU, set vectors and stack. */ mov x0, x28 - bl ___kvm_hyp_init // Clobbers x0..x3 + bl ___kvm_hyp_init // Clobbers x0..x2 /* Leave idmap. */ mov x0, x29 |