linux-kernel - [PATCH v5 02/10] KVM: SVM: Fix snp_context

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Message-ID: <20241107232457.4059785-3-dionnaglaze@google.com>
Date: Thu,  7 Nov 2024 23:24:42 +0000
From: Dionna Glaze <dionnaglaze@...gle.com>
To: linux-kernel@...r.kernel.org, x86@...nel.org, 
	Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, 
	Ashish Kalra <ashish.kalra@....com>, Brijesh Singh <brijesh.singh@....com>, 
	Michael Roth <michael.roth@....com>
Cc: linux-coco@...ts.linux.dev, Dionna Glaze <dionnaglaze@...gle.com>, 
	Tom Lendacky <thomas.lendacky@....com>, John Allen <john.allen@....com>, 
	Herbert Xu <herbert@...dor.apana.org.au>, "David S. Miller" <davem@...emloft.net>, 
	Luis Chamberlain <mcgrof@...nel.org>, Russ Weight <russ.weight@...ux.dev>, 
	Danilo Krummrich <dakr@...hat.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	"Rafael J. Wysocki" <rafael@...nel.org>, Tianfei zhang <tianfei.zhang@...el.com>, 
	Alexey Kardashevskiy <aik@....com>, stable@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH v5 02/10] KVM: SVM: Fix snp_context_create error reporting

Failure to allocate should not return -ENOTTY.
Command failure has multiple possible error modes.

Fixes: 136d8bc931c8 ("KVM: SEV: Add KVM_SEV_SNP_LAUNCH_START command")

CC: Sean Christopherson <seanjc@...gle.com>
CC: Paolo Bonzini <pbonzini@...hat.com>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Ingo Molnar <mingo@...hat.com>
CC: Borislav Petkov <bp@...en8.de>
CC: Dave Hansen <dave.hansen@...ux.intel.com>
CC: Ashish Kalra <ashish.kalra@....com>
CC: Tom Lendacky <thomas.lendacky@....com>
CC: John Allen <john.allen@....com>
CC: Herbert Xu <herbert@...dor.apana.org.au>
CC: "David S. Miller" <davem@...emloft.net>
CC: Michael Roth <michael.roth@....com>
CC: Luis Chamberlain <mcgrof@...nel.org>
CC: Russ Weight <russ.weight@...ux.dev>
CC: Danilo Krummrich <dakr@...hat.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: "Rafael J. Wysocki" <rafael@...nel.org>
CC: Tianfei zhang <tianfei.zhang@...el.com>
CC: Alexey Kardashevskiy <aik@....com>
CC: stable@...r.kernel.org

Signed-off-by: Dionna Glaze <dionnaglaze@...gle.com>
---
 arch/x86/kvm/svm/sev.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 357906375ec59..d0e0152aefb32 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -2171,7 +2171,7 @@ static void *snp_context_create(struct kvm *kvm, struct kvm_sev_cmd *argp)
 	/* Allocate memory for context page */
 	context = snp_alloc_firmware_page(GFP_KERNEL_ACCOUNT);
 	if (!context)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	data.address = __psp_pa(context);
 	rc = __sev_issue_cmd(argp->sev_fd, SEV_CMD_SNP_GCTX_CREATE, &data, &argp->error);
@@ -2179,7 +2179,7 @@ static void *snp_context_create(struct kvm *kvm, struct kvm_sev_cmd *argp)
 		pr_warn("Failed to create SEV-SNP context, rc %d fw_error %d",
 			rc, argp->error);
 		snp_free_firmware_page(context);
-		return NULL;
+		return ERR_PTR(rc);
 	}
 
 	return context;
@@ -2227,8 +2227,8 @@ static int snp_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
 		return -EINVAL;
 
 	sev->snp_context = snp_context_create(kvm, argp);
-	if (!sev->snp_context)
-		return -ENOTTY;
+	if (IS_ERR(sev->snp_context))
+		return PTR_ERR(sev->snp_context);
 
 	start.gctx_paddr = __psp_pa(sev->snp_context);
 	start.policy = params.policy;
-- 
2.47.0.277.g8800431eea-goog