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- Export sev_es_ghcb_hv_call() so that HyperV Isolation VMs can use it too

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- Non-urgent fixes and cleanups
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Merge tag 'x86_sev_for_v5.16_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 SEV updates from Borislav Petkov:

 - Export sev_es_ghcb_hv_call() so that HyperV Isolation VMs can use it
   too

 - Non-urgent fixes and cleanups

* tag 'x86_sev_for_v5.16_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/sev: Expose sev_es_ghcb_hv_call() for use by HyperV
  x86/sev: Allow #VC exceptions on the VC2 stack
  x86/sev: Fix stack type check in vc_switch_off_ist()
  x86/sme: Use #define USE_EARLY_PGTABLE_L5 in mem_encrypt_identity.c
  x86/sev: Carve out HV call's return value verification
This commit is contained in:
Linus Torvalds 2021-11-01 15:52:26 -07:00
commit 20273d2588
5 changed files with 80 additions and 39 deletions
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6
arch/x86/include/asm/sev.h
View File

@ -53,6 +53,7 @@ static inline u64 lower_bits(u64 val, unsigned int bits)
struct real_mode_header;
enum stack_type;
struct ghcb;
/* Early IDT entry points for #VC handler */
extern void vc_no_ghcb(void);
@ -81,6 +82,11 @@ static __always_inline void sev_es_nmi_complete(void)
__sev_es_nmi_complete();
}
extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
extern enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
bool set_ghcb_msr,
struct es_em_ctxt *ctxt,
u64 exit_code, u64 exit_info_1,
u64 exit_info_2);
#else
static inline void sev_es_ist_enter(struct pt_regs *regs) { }
static inline void sev_es_ist_exit(void) { }

68
arch/x86/kernel/sev-shared.c
View File

@ -94,25 +94,15 @@ static void vc_finish_insn(struct es_em_ctxt *ctxt)
ctxt->regs->ip += ctxt->insn.length;
}
static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
struct es_em_ctxt *ctxt,
u64 exit_code, u64 exit_info_1,
u64 exit_info_2)
static enum es_result verify_exception_info(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
{
enum es_result ret;
u32 ret;
/* Fill in protocol and format specifiers */
ghcb->protocol_version = GHCB_PROTOCOL_MAX;
ghcb->ghcb_usage = GHCB_DEFAULT_USAGE;
ret = ghcb->save.sw_exit_info_1 & GENMASK_ULL(31, 0);
if (!ret)
return ES_OK;
ghcb_set_sw_exit_code(ghcb, exit_code);
ghcb_set_sw_exit_info_1(ghcb, exit_info_1);
ghcb_set_sw_exit_info_2(ghcb, exit_info_2);
sev_es_wr_ghcb_msr(__pa(ghcb));
VMGEXIT();
if ((ghcb->save.sw_exit_info_1 & 0xffffffff) == 1) {
if (ret == 1) {
u64 info = ghcb->save.sw_exit_info_2;
unsigned long v;
@ -124,19 +114,40 @@ static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
((v == X86_TRAP_GP) || (v == X86_TRAP_UD)) &&
((info & SVM_EVTINJ_TYPE_MASK) == SVM_EVTINJ_TYPE_EXEPT)) {
ctxt->fi.vector = v;
if (info & SVM_EVTINJ_VALID_ERR)
ctxt->fi.error_code = info >> 32;
ret = ES_EXCEPTION;
} else {
ret = ES_VMM_ERROR;
return ES_EXCEPTION;
}
} else if (ghcb->save.sw_exit_info_1 & 0xffffffff) {
ret = ES_VMM_ERROR;
} else {
ret = ES_OK;
}
return ret;
return ES_VMM_ERROR;
}
enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, bool set_ghcb_msr,
struct es_em_ctxt *ctxt, u64 exit_code,
u64 exit_info_1, u64 exit_info_2)
{
/* Fill in protocol and format specifiers */
ghcb->protocol_version = GHCB_PROTOCOL_MAX;
ghcb->ghcb_usage = GHCB_DEFAULT_USAGE;
ghcb_set_sw_exit_code(ghcb, exit_code);
ghcb_set_sw_exit_info_1(ghcb, exit_info_1);
ghcb_set_sw_exit_info_2(ghcb, exit_info_2);
/*
* Hyper-V unenlightened guests use a paravisor for communicating and
* GHCB pages are being allocated and set up by that paravisor. Linux
* should not change the GHCB page's physical address.
*/
if (set_ghcb_msr)
sev_es_wr_ghcb_msr(__pa(ghcb));
VMGEXIT();
return verify_exception_info(ghcb, ctxt);
}
/*
@ -413,7 +424,7 @@ static enum es_result vc_handle_ioio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
*/
sw_scratch = __pa(ghcb) + offsetof(struct ghcb, shared_buffer);
ghcb_set_sw_scratch(ghcb, sw_scratch);
ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_IOIO,
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_IOIO,
exit_info_1, exit_info_2);
if (ret != ES_OK)
return ret;
@ -455,7 +466,8 @@ static enum es_result vc_handle_ioio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
ghcb_set_rax(ghcb, rax);
ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_IOIO, exit_info_1, 0);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt,
SVM_EXIT_IOIO, exit_info_1, 0);
if (ret != ES_OK)
return ret;
@ -486,7 +498,7 @@ static enum es_result vc_handle_cpuid(struct ghcb *ghcb,
/* xgetbv will cause #GP - use reset value for xcr0 */
ghcb_set_xcr0(ghcb, 1);
ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_CPUID, 0, 0);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_CPUID, 0, 0);
if (ret != ES_OK)
return ret;
@ -511,7 +523,7 @@ static enum es_result vc_handle_rdtsc(struct ghcb *ghcb,
bool rdtscp = (exit_code == SVM_EXIT_RDTSCP);
enum es_result ret;
ret = sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, 0, 0);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, exit_code, 0, 0);
if (ret != ES_OK)
return ret;

34
arch/x86/kernel/sev.c
View File

@ -648,7 +648,8 @@ static enum es_result vc_handle_msr(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
ghcb_set_rdx(ghcb, regs->dx);
}
ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_MSR, exit_info_1, 0);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_MSR,
exit_info_1, 0);
if ((ret == ES_OK) && (!exit_info_1)) {
regs->ax = ghcb->save.rax;
@ -867,7 +868,7 @@ static enum es_result vc_do_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt,
ghcb_set_sw_scratch(ghcb, ghcb_pa + offsetof(struct ghcb, shared_buffer));
return sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, exit_info_1, exit_info_2);
return sev_es_ghcb_hv_call(ghcb, true, ctxt, exit_code, exit_info_1, exit_info_2);
}
static enum es_result vc_handle_mmio_twobyte_ops(struct ghcb *ghcb,
@ -1117,7 +1118,7 @@ static enum es_result vc_handle_dr7_write(struct ghcb *ghcb,
/* Using a value of 0 for ExitInfo1 means RAX holds the value */
ghcb_set_rax(ghcb, val);
ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WRITE_DR7, 0, 0);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_WRITE_DR7, 0, 0);
if (ret != ES_OK)
return ret;
@ -1147,7 +1148,7 @@ static enum es_result vc_handle_dr7_read(struct ghcb *ghcb,
static enum es_result vc_handle_wbinvd(struct ghcb *ghcb,
struct es_em_ctxt *ctxt)
{
return sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WBINVD, 0, 0);
return sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_WBINVD, 0, 0);
}
static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
@ -1156,7 +1157,7 @@ static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt
ghcb_set_rcx(ghcb, ctxt->regs->cx);
ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_RDPMC, 0, 0);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_RDPMC, 0, 0);
if (ret != ES_OK)
return ret;
@ -1197,7 +1198,7 @@ static enum es_result vc_handle_vmmcall(struct ghcb *ghcb,
if (x86_platform.hyper.sev_es_hcall_prepare)
x86_platform.hyper.sev_es_hcall_prepare(ghcb, ctxt->regs);
ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_VMMCALL, 0, 0);
ret = sev_es_ghcb_hv_call(ghcb, true, ctxt, SVM_EXIT_VMMCALL, 0, 0);
if (ret != ES_OK)
return ret;
@ -1319,13 +1320,26 @@ static __always_inline void vc_forward_exception(struct es_em_ctxt *ctxt)
}
}
static __always_inline bool on_vc_fallback_stack(struct pt_regs *regs)
static __always_inline bool is_vc2_stack(unsigned long sp)
{
unsigned long sp = (unsigned long)regs;
return (sp >= __this_cpu_ist_bottom_va(VC2) && sp < __this_cpu_ist_top_va(VC2));
}
static __always_inline bool vc_from_invalid_context(struct pt_regs *regs)
{
unsigned long sp, prev_sp;
sp = (unsigned long)regs;
prev_sp = regs->sp;
/*
* If the code was already executing on the VC2 stack when the #VC
* happened, let it proceed to the normal handling routine. This way the
* code executing on the VC2 stack can cause #VC exceptions to get handled.
*/
return is_vc2_stack(sp) && !is_vc2_stack(prev_sp);
}
static bool vc_raw_handle_exception(struct pt_regs *regs, unsigned long error_code)
{
struct ghcb_state state;
@ -1406,7 +1420,7 @@ DEFINE_IDTENTRY_VC_KERNEL(exc_vmm_communication)
* But keep this here in case the noinstr annotations are violated due
* to bug elsewhere.
*/
if (unlikely(on_vc_fallback_stack(regs))) {
if (unlikely(vc_from_invalid_context(regs))) {
instrumentation_begin();
panic("Can't handle #VC exception from unsupported context\n");
instrumentation_end();

2
arch/x86/kernel/traps.c
View File

@ -709,7 +709,7 @@ asmlinkage __visible noinstr struct pt_regs *vc_switch_off_ist(struct pt_regs *r
stack = (unsigned long *)sp;
if (!get_stack_info_noinstr(stack, current, &info) || info.type == STACK_TYPE_ENTRY ||
info.type >= STACK_TYPE_EXCEPTION_LAST)
info.type > STACK_TYPE_EXCEPTION_LAST)
sp = __this_cpu_ist_top_va(VC2);
sync:

9
arch/x86/mm/mem_encrypt_identity.c
View File

@ -27,6 +27,15 @@
#undef CONFIG_PARAVIRT_XXL
#undef CONFIG_PARAVIRT_SPINLOCKS
/*
* This code runs before CPU feature bits are set. By default, the
* pgtable_l5_enabled() function uses bit X86_FEATURE_LA57 to determine if
* 5-level paging is active, so that won't work here. USE_EARLY_PGTABLE_L5
* is provided to handle this situation and, instead, use a variable that
* has been set by the early boot code.
*/
#define USE_EARLY_PGTABLE_L5
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/mem_encrypt.h>