KVM: PPC: Book3S HV: Flush link stack on guest exit to host kernel

commit af2e8c68b9c5403f77096969c516f742f5bb29e0 upstream.

On some systems that are vulnerable to Spectre v2, it is up to
software to flush the link stack (return address stack), in order to
protect against Spectre-RSB.

When exiting from a guest we do some house keeping and then
potentially exit to C code which is several stack frames deep in the
host kernel. We will then execute a series of returns without
preceeding calls, opening up the possiblity that the guest could have
poisoned the link stack, and direct speculative execution of the host
to a gadget of some sort.

To prevent this we add a flush of the link stack on exit from a guest.
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
[dja: straightforward backport to v4.19]
Signed-off-by: NDaniel Axtens <dja@axtens.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/powerpc/include/asm/asm-prototypes.h

@@ -147,8 +147,10 @@ void _kvmppc_save_tm_pr(struct kvm_vcpu *vcpu, u64 guest_msr);
 extern s32 patch__call_flush_count_cache;
 extern s32 patch__flush_count_cache_return;
 extern s32 patch__flush_link_stack_return;
+extern s32 patch__call_kvm_flush_link_stack;
 extern s32 patch__memset_nocache, patch__memcpy_nocache;
 
 extern long flush_count_cache;
+extern long kvm_flush_link_stack;
 
 #endif /* _ASM_POWERPC_ASM_PROTOTYPES_H */

arch/powerpc/kernel/security.c

@@ -392,6 +392,9 @@ static void toggle_count_cache_flush(bool enable)
 
 	if (!enable) {
 		patch_instruction_site(&patch__call_flush_count_cache, PPC_INST_NOP);
+#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
+		patch_instruction_site(&patch__call_kvm_flush_link_stack, PPC_INST_NOP);
+#endif
 		pr_info("link-stack-flush: software flush disabled.\n");
 		link_stack_flush_enabled = false;
 		no_count_cache_flush();
@@ -402,6 +405,12 @@ static void toggle_count_cache_flush(bool enable)
 	patch_branch_site(&patch__call_flush_count_cache,
 			  (u64)&flush_count_cache, BRANCH_SET_LINK);
 
+#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
+	// This enables the branch from guest_exit_cont to kvm_flush_link_stack
+	patch_branch_site(&patch__call_kvm_flush_link_stack,
+			  (u64)&kvm_flush_link_stack, BRANCH_SET_LINK);
+#endif
+
 	pr_info("link-stack-flush: software flush enabled.\n");
 	link_stack_flush_enabled = true;
 

arch/powerpc/kvm/book3s_hv_rmhandlers.S

@@ -18,6 +18,7 @@
  */
 
 #include <asm/ppc_asm.h>
+#include <asm/code-patching-asm.h>
 #include <asm/kvm_asm.h>
 #include <asm/reg.h>
 #include <asm/mmu.h>
@@ -1559,6 +1560,10 @@ mc_cont:
 1:
 #endif /* CONFIG_KVM_XICS */
 
+	/* Possibly flush the link stack here. */
+1:	nop
+	patch_site 1b patch__call_kvm_flush_link_stack
+
 	/* For hash guest, read the guest SLB and save it away */
 	ld	r5, VCPU_KVM(r9)
 	lbz	r0, KVM_RADIX(r5)
@@ -2107,6 +2112,29 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
 	mtlr	r0
 	blr
 
+.balign 32
+.global kvm_flush_link_stack
+kvm_flush_link_stack:
+	/* Save LR into r0 */
+	mflr	r0
+
+	/* Flush the link stack. On Power8 it's up to 32 entries in size. */
+	.rept 32
+	bl	.+4
+	.endr
+
+	/* And on Power9 it's up to 64. */
+BEGIN_FTR_SECTION
+	.rept 32
+	bl	.+4
+	.endr
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
+
+	/* Restore LR */
+	mtlr	r0
+	blr
+
+
 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 /*
  * Softpatch interrupt for transactional memory emulation cases