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SVSM_APIC_CONFIGURE_EMULATION > (shortened to SVSM_APIC_CONFIG_EMULATION for brevity), call 1, provides > the controls whether the guest can make use of the SVSM APIC protocol. > > Implement this call, and register Alternate Injection for the guest > by default. > > Signed-off-by: Melody Wang > --- > arch/x86/boot/compressed/sev.c | 17 +++++++++++++++++ > arch/x86/boot/compressed/sev.h | 6 ++++++ > 2 files changed, 23 insertions(+) > > diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c > index 655291a03dcc..a98185b3869a 100644 > --- a/arch/x86/boot/compressed/sev.c > +++ b/arch/x86/boot/compressed/sev.c > @@ -518,5 +518,22 @@ u64 sev_prepare(void) > if (unsupported) > return unsupported; > > + /* Register Alternate Injection */ > + if (early_is_sevsnp_guest() && snp_vmpl) { > + struct svsm_call call = {}; > + int ret; > + > + if (!(sev_get_status() & MSR_AMD64_SNP_ALTERNATE_INJ)) > + return 0; > + > + call.caa = (struct svsm_ca *)boot_svsm_caa_pa; > + call.rax = SVSM_APIC_CALL(SVSM_APIC_CONFIG_EMULATION); > + call.rcx = SVSM_AI_REGISTER; > + > + ret = svsm_call_msr_protocol(&call); > + if (ret) > + sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SNP_UNSUPPORTED); Shouldn't this really be where the permissive setting of allowing all interrupts be done, too, instead of where it is done in patch #3? Thanks, Tom > + } > + > return 0; > } > diff --git a/arch/x86/boot/compressed/sev.h b/arch/x86/boot/compressed/sev.h > index 22637b416b46..dd058af2e7aa 100644 > --- a/arch/x86/boot/compressed/sev.h > +++ b/arch/x86/boot/compressed/sev.h > @@ -12,6 +12,12 @@ > > #include > > +enum svsm_ai_ctrl { > + SVSM_AI_DISABLE, Isn't the zero value "Query APIC Emulation", not disable? > + SVSM_AI_DEREGISTER, s/DEREGISTER/UNREGISTER/ Thanks, Tom > + SVSM_AI_REGISTER, > +}; > + > void snp_accept_memory(phys_addr_t start, phys_addr_t end); > u64 sev_get_status(void); > bool early_is_sevsnp_guest(void);