Messages in this thread | | | Date | Mon, 1 Mar 2021 08:57:06 -0800 | From | Sean Christopherson <> | Subject | Re: [PATCH 12/25] x86/sgx: Add helper to update SGX_LEPUBKEYHASHn MSRs |
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On Mon, Mar 01, 2021, Kai Huang wrote: > diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c > index 8c922e68274d..276220d0e4b5 100644 > --- a/arch/x86/kernel/cpu/sgx/main.c > +++ b/arch/x86/kernel/cpu/sgx/main.c > @@ -696,6 +696,21 @@ static bool __init sgx_page_cache_init(void) > return true; > } > > + > +/* > + * Update the SGX_LEPUBKEYHASH MSRs to the values specified by caller. > + * Bare-metal driver requires to update them to hash of enclave's signer > + * before EINIT. KVM needs to update them to guest's virtual MSR values > + * before doing EINIT from guest. > + */ > +void sgx_update_lepubkeyhash(u64 *lepubkeyhash) > +{ > + int i;
Probably worth adding:
WARN_ON_ONCE(preemptible());
> + > + for (i = 0; i < 4; i++) > + wrmsrl(MSR_IA32_SGXLEPUBKEYHASH0 + i, lepubkeyhash[i]); > +} > + > static int __init sgx_init(void) > { > int ret;
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