[PATCH v3 67/75] x86/vmware: Add VMware specific handling for VMMCALL under SEV-ES

Joerg Roedel
2020-04-28T15:19:34Z

From: Doug Covelli <dcovelli@vmware.com>

This change adds VMware specific handling for #VC faults caused by
VMMCALL instructions.

Signed-off-by: Doug Covelli <dcovelli@vmware.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
[ jroedel@suse.de: - Adapt to different paravirt interface ]
Co-developed-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Joerg Roedel <jroedel@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..d2129d5e8373 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_is_valid_rbx(ghcb) &&
+ ghcb_is_valid_rcx(ghcb) &&
+ ghcb_is_valid_rdx(ghcb) &&
+ ghcb_is_valid_rsi(ghcb) &&
+ ghcb_is_valid_rdi(ghcb) &&
+ ghcb_is_valid_rbp(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
};
--
2.17.1