linux-kernel - [RFC V1 PATCH 2/3] selftests: kvm: sev: Handle hypercall exit

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Message-Id: <20220524205646.1798325-3-vannapurve@google.com>
Date:   Tue, 24 May 2022 20:56:45 +0000
From:   Vishal Annapurve <vannapurve@...gle.com>
To:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Cc:     pbonzini@...hat.com, vkuznets@...hat.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, shuah@...nel.org, yang.zhong@...el.com,
        drjones@...hat.com, ricarkol@...gle.com, aaronlewis@...gle.com,
        wei.w.wang@...el.com, kirill.shutemov@...ux.intel.com,
        corbet@....net, hughd@...gle.com, jlayton@...nel.org,
        bfields@...ldses.org, akpm@...ux-foundation.org,
        chao.p.peng@...ux.intel.com, yu.c.zhang@...ux.intel.com,
        jun.nakajima@...el.com, dave.hansen@...el.com,
        michael.roth@....com, qperret@...gle.com, steven.price@....com,
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        axelrasmussen@...gle.com, maciej.szmigiero@...cle.com,
        mizhang@...gle.com, bgardon@...gle.com,
        Vishal Annapurve <vannapurve@...gle.com>
Subject: [RFC V1 PATCH 2/3] selftests: kvm: sev: Handle hypercall exit

Add support for forwarding hypercalls to vmm from
VC handler.

Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>
---
 .../selftests/kvm/lib/x86_64/sev_exitlib.c    | 39 ++++++++++++++++---
 1 file changed, 34 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c b/tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c
index b3f7b0297e5b..749b9264f90d 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c
@@ -199,6 +199,31 @@ static int handle_vc_cpuid(struct ghcb *ghcb, u64 ghcb_gpa, struct ex_regs *regs
 	return 0;
 }
 
+static int handle_vc_vmmcall(struct ghcb *ghcb, u64 ghcb_gpa, struct ex_regs *regs)
+{
+	int ret;
+
+	ghcb_set_rax(ghcb, regs->rax);
+	ghcb_set_rbx(ghcb, regs->rbx);
+	ghcb_set_rcx(ghcb, regs->rcx);
+	ghcb_set_rdx(ghcb, regs->rdx);
+	ghcb_set_rsi(ghcb, regs->rsi);
+	ghcb_set_cpl(ghcb, 0);
+
+	ret = sev_es_ghcb_hv_call(ghcb, ghcb_gpa, SVM_EXIT_VMMCALL);
+	if (ret)
+		return ret;
+
+	if (!ghcb_rax_is_valid(ghcb))
+		return 1;
+
+	regs->rax = ghcb->save.rax;
+
+	regs->rip += 3;
+
+	return 0;
+}
+
 static int handle_msr_vc_cpuid(struct ex_regs *regs)
 {
 	uint32_t fn = regs->rax & 0xFFFFFFFF;
@@ -239,11 +264,15 @@ static int handle_msr_vc_cpuid(struct ex_regs *regs)
 
 int sev_es_handle_vc(void *ghcb, u64 ghcb_gpa, struct ex_regs *regs)
 {
-	if (regs->error_code != SVM_EXIT_CPUID)
-		return 1;
+	if (regs->error_code == SVM_EXIT_CPUID) {
+		if (!ghcb)
+			return handle_msr_vc_cpuid(regs);
+
+		return handle_vc_cpuid(ghcb, ghcb_gpa, regs);
+	}
 
-	if (!ghcb)
-		return handle_msr_vc_cpuid(regs);
+	if (regs->error_code == SVM_EXIT_VMMCALL)
+		return handle_vc_vmmcall(ghcb, ghcb_gpa, regs);
 
-	return handle_vc_cpuid(ghcb, ghcb_gpa, regs);
+	return 1;
 }
-- 
2.36.1.124.g0e6072fb45-goog