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Tue, 8 Jun 2021 15:59:47 +0000 Date: Tue, 8 Jun 2021 10:59:41 -0500 From: Venu Busireddy To: Brijesh Singh Cc: x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, linux-crypto@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , tony.luck@intel.com, npmccallum@redhat.com Subject: Re: [PATCH Part1 RFC v3 02/22] x86/sev: Define the Linux specific guest termination reasons Message-ID: References: <20210602140416.23573-1-brijesh.singh@amd.com> <20210602140416.23573-3-brijesh.singh@amd.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210602140416.23573-3-brijesh.singh@amd.com> X-Originating-IP: [138.3.201.62] X-ClientProxiedBy: SA0PR11CA0091.namprd11.prod.outlook.com (2603:10b6:806:d1::6) To SN6PR10MB2576.namprd10.prod.outlook.com (2603:10b6:805:44::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from dt (138.3.201.62) by SA0PR11CA0091.namprd11.prod.outlook.com (2603:10b6:806:d1::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4195.22 via Frontend Transport; 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The reason > codes defined in the set 0 do not cover all possible causes for a guest > to request termination. > > The reason set 1 to 255 is reserved for the vendor-specific codes. > Reseve the reason set 1 for the Linux guest. Define an error codes for > reason set 1. > > While at it, change the sev_es_terminate() to accept the reason set > parameter. > > Signed-off-by: Brijesh Singh > --- > arch/x86/boot/compressed/sev.c | 6 +++--- > arch/x86/include/asm/sev-common.h | 5 +++++ > arch/x86/kernel/sev-shared.c | 6 +++--- > arch/x86/kernel/sev.c | 4 ++-- > 4 files changed, 13 insertions(+), 8 deletions(-) > > diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c > index 28bcf04c022e..87621f4e4703 100644 > --- a/arch/x86/boot/compressed/sev.c > +++ b/arch/x86/boot/compressed/sev.c > @@ -122,7 +122,7 @@ static enum es_result vc_read_mem(struct es_em_ctxt *ctxt, > static bool early_setup_sev_es(void) > { > if (!sev_es_negotiate_protocol()) > - sev_es_terminate(GHCB_SEV_ES_PROT_UNSUPPORTED); > + sev_es_terminate(0, GHCB_SEV_ES_PROT_UNSUPPORTED); > > if (set_page_decrypted((unsigned long)&boot_ghcb_page)) > return false; > @@ -175,7 +175,7 @@ void do_boot_stage2_vc(struct pt_regs *regs, unsigned long exit_code) > enum es_result result; > > if (!boot_ghcb && !early_setup_sev_es()) > - sev_es_terminate(GHCB_SEV_ES_GEN_REQ); > + sev_es_terminate(0, GHCB_SEV_ES_GEN_REQ); > > vc_ghcb_invalidate(boot_ghcb); > result = vc_init_em_ctxt(&ctxt, regs, exit_code); > @@ -202,5 +202,5 @@ void do_boot_stage2_vc(struct pt_regs *regs, unsigned long exit_code) > if (result == ES_OK) > vc_finish_insn(&ctxt); > else if (result != ES_RETRY) > - sev_es_terminate(GHCB_SEV_ES_GEN_REQ); > + sev_es_terminate(0, GHCB_SEV_ES_GEN_REQ); > } > diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h > index 11b7d9cea775..f1e2aacb0d61 100644 > --- a/arch/x86/include/asm/sev-common.h > +++ b/arch/x86/include/asm/sev-common.h > @@ -59,4 +59,9 @@ > > #define GHCB_RESP_CODE(v) ((v) & GHCB_MSR_INFO_MASK) > > +/* Linux specific reason codes (used with reason set 1) */ > +#define GHCB_TERM_REGISTER 0 /* GHCB GPA registration failure */ > +#define GHCB_TERM_PSC 1 /* Page State Change failure */ > +#define GHCB_TERM_PVALIDATE 2 /* Pvalidate failure */ > + > #endif > diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c > index 14198075ff8b..de0e7e6c52b8 100644 > --- a/arch/x86/kernel/sev-shared.c > +++ b/arch/x86/kernel/sev-shared.c > @@ -24,7 +24,7 @@ static bool __init sev_es_check_cpu_features(void) > return true; > } > > -static void __noreturn sev_es_terminate(unsigned int reason) > +static void __noreturn sev_es_terminate(unsigned int set, unsigned int reason) > { > u64 val = GHCB_MSR_TERM_REQ; > > @@ -32,7 +32,7 @@ static void __noreturn sev_es_terminate(unsigned int reason) > * Tell the hypervisor what went wrong - only reason-set 0 is > * currently supported. > */ Since reason set 0 is not the only set supported anymore, maybe the part about reason set 0 should be removed from the above comment? Venu > - val |= GHCB_SEV_TERM_REASON(0, reason); > + val |= GHCB_SEV_TERM_REASON(set, reason); > > /* Request Guest Termination from Hypvervisor */ > sev_es_wr_ghcb_msr(val); > @@ -207,7 +207,7 @@ void __init do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code) > > fail: > /* Terminate the guest */ > - sev_es_terminate(GHCB_SEV_ES_GEN_REQ); > + sev_es_terminate(0, GHCB_SEV_ES_GEN_REQ); > } > > static enum es_result vc_insn_string_read(struct es_em_ctxt *ctxt, > diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c > index 460717e3f72d..77a754365ba9 100644 > --- a/arch/x86/kernel/sev.c > +++ b/arch/x86/kernel/sev.c > @@ -1383,7 +1383,7 @@ DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication) > show_regs(regs); > > /* Ask hypervisor to sev_es_terminate */ > - sev_es_terminate(GHCB_SEV_ES_GEN_REQ); > + sev_es_terminate(0, GHCB_SEV_ES_GEN_REQ); > > /* If that fails and we get here - just panic */ > panic("Returned from Terminate-Request to Hypervisor\n"); > @@ -1416,7 +1416,7 @@ bool __init handle_vc_boot_ghcb(struct pt_regs *regs) > > /* Do initial setup or terminate the guest */ > if (unlikely(boot_ghcb == NULL && !sev_es_setup_ghcb())) > - sev_es_terminate(GHCB_SEV_ES_GEN_REQ); > + sev_es_terminate(0, GHCB_SEV_ES_GEN_REQ); > > vc_ghcb_invalidate(boot_ghcb); > > -- > 2.17.1 >