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KVM: arm64: Update context references from host to hyp 

Hyp now has its own nominal context for saving and restoring its state
when switching to and from a guest. Update the related comments and
utilities to match the new name.

Signed-off-by: Andrew Scull <ascull@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200915104643.2543892-10-ascull@google.com
This commit is contained in:
Andrew Scull 2020-09-15 11:46:33 +01:00 committed by Marc Zyngier
parent b619d9aa8b
commit 7c2e76d87f
2 changed files with 14 additions and 14 deletions
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6
arch/arm64/include/asm/kvm_ptrauth.h
View File

@ -60,7 +60,7 @@
.endm
/*
* Both ptrauth_switch_to_guest and ptrauth_switch_to_host macros will
* Both ptrauth_switch_to_guest and ptrauth_switch_to_hyp macros will
* check for the presence ARM64_HAS_ADDRESS_AUTH, which is defined as
* (ARM64_HAS_ADDRESS_AUTH_ARCH || ARM64_HAS_ADDRESS_AUTH_IMP_DEF) and
* then proceed ahead with the save/restore of Pointer Authentication
@ -78,7 +78,7 @@ alternative_else_nop_endif
.L__skip_switch\@:
.endm
.macro ptrauth_switch_to_host g_ctxt, h_ctxt, reg1, reg2, reg3
.macro ptrauth_switch_to_hyp g_ctxt, h_ctxt, reg1, reg2, reg3
alternative_if_not ARM64_HAS_ADDRESS_AUTH
b .L__skip_switch\@
alternative_else_nop_endif
@ -96,7 +96,7 @@ alternative_else_nop_endif
#else /* !CONFIG_ARM64_PTR_AUTH */
.macro ptrauth_switch_to_guest g_ctxt, reg1, reg2, reg3
.endm
.macro ptrauth_switch_to_host g_ctxt, h_ctxt, reg1, reg2, reg3
.macro ptrauth_switch_to_hyp g_ctxt, h_ctxt, reg1, reg2, reg3
.endm
#endif /* CONFIG_ARM64_PTR_AUTH */
#endif /* __ASSEMBLY__ */

22
arch/arm64/kvm/hyp/entry.S
View File

@ -66,16 +66,16 @@ SYM_FUNC_START(__guest_enter)
hyp_adr_this_cpu x1, kvm_hyp_ctxt, x2
// Store the host regs
// Store the hyp regs
save_callee_saved_regs x1
// Save the host's sp_el0
// Save hyp's sp_el0
save_sp_el0 x1, x2
// Now the host state is stored if we have a pending RAS SError it must
// affect the host. If any asynchronous exception is pending we defer
// the guest entry. The DSB isn't necessary before v8.2 as any SError
// would be fatal.
// Now the hyp state is stored if we have a pending RAS SError it must
// affect the host or hyp. If any asynchronous exception is pending we
// defer the guest entry. The DSB isn't necessary before v8.2 as any
// SError would be fatal.
alternative_if ARM64_HAS_RAS_EXTN
dsb nshst
isb
@ -150,17 +150,17 @@ SYM_INNER_LABEL(__guest_exit, SYM_L_GLOBAL)
hyp_adr_this_cpu x2, kvm_hyp_ctxt, x3
// Macro ptrauth_switch_to_guest format:
// ptrauth_switch_to_host(guest cxt, host cxt, tmp1, tmp2, tmp3)
// Macro ptrauth_switch_to_hyp format:
// ptrauth_switch_to_hyp(guest cxt, host cxt, tmp1, tmp2, tmp3)
// The below macro to save/restore keys is not implemented in C code
// as it may cause Pointer Authentication key signing mismatch errors
// when this feature is enabled for kernel code.
ptrauth_switch_to_host x1, x2, x3, x4, x5
ptrauth_switch_to_hyp x1, x2, x3, x4, x5
// Restore the hosts's sp_el0
// Restore hyp's sp_el0
restore_sp_el0 x2, x3
// Now restore the host regs
// Now restore the hyp regs
restore_callee_saved_regs x2
alternative_if ARM64_HAS_RAS_EXTN