[PATCH v7 64/72] x86/vmware: Add VMware specific handling for VMMCALL under SEV-ES

Joerg Roedel
2020-09-07T13:16:05Z

From: Doug Covelli <dcovelli at vmware.com>

Add VMware specific handling for #VC faults caused by VMMCALL
instructions.

Signed-off-by: Doug Covelli <dcovelli at vmware.com>
Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
[ jroedel at suse.de: - Adapt to different paravirt interface ]
Co-developed-by: Joerg Roedel <jroedel at suse.de>
Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 arch/x86/kernel/cpu/vmware.c | 50 ++++++++++++++++++++++++++++++++----
 1 file changed, 45 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index 9b6fafa69be9..924571fe5864 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -33,6 +33,7 @@
 #include <asm/timer.h>
 #include <asm/apic.h>
 #include <asm/vmware.h>
+#include <asm/svm.h>

 #undef pr_fmt
 #define pr_fmt(fmt)	"vmware: " fmt
@@ -476,10 +477,49 @@ static bool __init vmware_legacy_x2apic_available(void)
 	       (eax & (1 << VMWARE_CMD_LEGACY_X2APIC)) != 0;
 }

+#ifdef CONFIG_AMD_MEM_ENCRYPT
+static void vmware_sev_es_hcall_prepare(struct ghcb *ghcb,
+					struct pt_regs *regs)
+{
+	/* Copy VMWARE specific Hypercall parameters to the GHCB */
+	ghcb_set_rip(ghcb, regs->ip);
+	ghcb_set_rbx(ghcb, regs->bx);
+	ghcb_set_rcx(ghcb, regs->cx);
+	ghcb_set_rdx(ghcb, regs->dx);
+	ghcb_set_rsi(ghcb, regs->si);
+	ghcb_set_rdi(ghcb, regs->di);
+	ghcb_set_rbp(ghcb, regs->bp);
+}
+
+static bool vmware_sev_es_hcall_finish(struct ghcb *ghcb, struct pt_regs *regs)
+{
+	if (!(ghcb_rbx_is_valid(ghcb) &&
+	      ghcb_rcx_is_valid(ghcb) &&
+	      ghcb_rdx_is_valid(ghcb) &&
+	      ghcb_rsi_is_valid(ghcb) &&
+	      ghcb_rdi_is_valid(ghcb) &&
+	      ghcb_rbp_is_valid(ghcb)))
+		return false;
+
+	regs->bx = ghcb->save.rbx;
+	regs->cx = ghcb->save.rcx;
+	regs->dx = ghcb->save.rdx;
+	regs->si = ghcb->save.rsi;
+	regs->di = ghcb->save.rdi;
+	regs->bp = ghcb->save.rbp;
+
+	return true;
+}
+#endif
+
 const __initconst struct hypervisor_x86 x86_hyper_vmware = {
-	.name			= "VMware",
-	.detect			= vmware_platform,
-	.type			= X86_HYPER_VMWARE,
-	.init.init_platform	= vmware_platform_setup,
-	.init.x2apic_available	= vmware_legacy_x2apic_available,
+	.name				= "VMware",
+	.detect				= vmware_platform,
+	.type				= X86_HYPER_VMWARE,
+	.init.init_platform		= vmware_platform_setup,
+	.init.x2apic_available		= vmware_legacy_x2apic_available,
+#ifdef CONFIG_AMD_MEM_ENCRYPT
+	.runtime.sev_es_hcall_prepare	= vmware_sev_es_hcall_prepare,
+	.runtime.sev_es_hcall_finish	= vmware_sev_es_hcall_finish,
+#endif
 };
--
2.28.0