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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] x86/hvm: Rework nested hap functions to reduce parameters
commit ddf820e1d6e82051be95eeb30a570426423e4f9f
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Tue Nov 30 17:05:09 2021 +0000
Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Jan 13 15:19:43 2022 +0000
x86/hvm: Rework nested hap functions to reduce parameters
Most functions in this call chain have 8 parameters, meaning that the final
two booleans are spilled to the stack for calls.
First, delete nestedhap_walk_L1_p2m and introduce nhvm_hap_walk_L1_p2m() as
a
thin wrapper around hvm_funcs, just like all the other nhvm_*() hooks. This
involves including xen/mm.h as the forward declaration of struct npfec is no
longer enough.
Next, replace the triple of booleans with struct npfec, which contains the
same information in the bottom 3 bits.
No functional change.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
xen/arch/x86/hvm/hvm.c | 5 +---
xen/arch/x86/hvm/svm/nestedsvm.c | 11 ++++----
xen/arch/x86/hvm/vmx/vvmx.c | 10 +++----
xen/arch/x86/include/asm/hvm/hvm.h | 14 +++++++---
xen/arch/x86/include/asm/hvm/nestedhvm.h | 6 +----
xen/arch/x86/include/asm/hvm/svm/nestedsvm.h | 6 ++---
xen/arch/x86/include/asm/hvm/vmx/vvmx.h | 8 +++---
xen/arch/x86/mm/hap/nested_hap.c | 40 +++++++---------------------
xen/arch/x86/mm/p2m.c | 12 +++++----
9 files changed, 47 insertions(+), 65 deletions(-)
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index d233550ae4..b0ee49a61a 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -1775,10 +1775,7 @@ int hvm_hap_nested_page_fault(paddr_t gpa, unsigned long
gla,
* the same as for shadow paging.
*/
- rv = nestedhvm_hap_nested_page_fault(curr, &gpa,
- npfec.read_access,
- npfec.write_access,
- npfec.insn_fetch);
+ rv = nestedhvm_hap_nested_page_fault(curr, &gpa, npfec);
switch (rv) {
case NESTEDHVM_PAGEFAULT_DONE:
case NESTEDHVM_PAGEFAULT_RETRY:
diff --git a/xen/arch/x86/hvm/svm/nestedsvm.c b/xen/arch/x86/hvm/svm/nestedsvm.c
index 6d90630040..abc178d8d4 100644
--- a/xen/arch/x86/hvm/svm/nestedsvm.c
+++ b/xen/arch/x86/hvm/svm/nestedsvm.c
@@ -1216,10 +1216,9 @@ nsvm_vmcb_hap_enabled(struct vcpu *v)
* walk is successful, the translated value is returned in
* L1_gpa. The result value tells what to do next.
*/
-int
-nsvm_hap_walk_L1_p2m(struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa,
- unsigned int *page_order, uint8_t *p2m_acc,
- bool_t access_r, bool_t access_w, bool_t access_x)
+int nsvm_hap_walk_L1_p2m(
+ struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa, unsigned int *page_order,
+ uint8_t *p2m_acc, struct npfec npfec)
{
uint32_t pfec;
unsigned long nested_cr3, gfn;
@@ -1227,9 +1226,9 @@ nsvm_hap_walk_L1_p2m(struct vcpu *v, paddr_t L2_gpa,
paddr_t *L1_gpa,
nested_cr3 = nhvm_vcpu_p2m_base(v);
pfec = PFEC_user_mode | PFEC_page_present;
- if ( access_w )
+ if ( npfec.write_access )
pfec |= PFEC_write_access;
- if ( access_x )
+ if ( npfec.insn_fetch )
pfec |= PFEC_insn_fetch;
/* Walk the guest-supplied NPT table, just as if it were a pagetable */
diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index e9f94daf64..7419ee9dd0 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -2346,16 +2346,16 @@ int nvmx_msr_read_intercept(unsigned int msr, u64
*msr_content)
* walk is successful, the translated value is returned in
* L1_gpa. The result value tells what to do next.
*/
-int
-nvmx_hap_walk_L1_p2m(struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa,
- unsigned int *page_order, uint8_t *p2m_acc,
- bool_t access_r, bool_t access_w, bool_t access_x)
+int nvmx_hap_walk_L1_p2m(
+ struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa, unsigned int *page_order,
+ uint8_t *p2m_acc, struct npfec npfec)
{
int rc;
unsigned long gfn;
uint64_t exit_qual;
uint32_t exit_reason = EXIT_REASON_EPT_VIOLATION;
- uint32_t rwx_rights = (access_x << 2) | (access_w << 1) | access_r;
+ uint32_t rwx_rights =
+ (npfec.insn_fetch << 2) | (npfec.write_access << 1) |
npfec.read_access;
struct nestedvmx *nvmx = &vcpu_2_nvmx(v);
vmx_vmcs_enter(v);
diff --git a/xen/arch/x86/include/asm/hvm/hvm.h
b/xen/arch/x86/include/asm/hvm/hvm.h
index 2767427aa9..cd9e73e266 100644
--- a/xen/arch/x86/include/asm/hvm/hvm.h
+++ b/xen/arch/x86/include/asm/hvm/hvm.h
@@ -20,6 +20,8 @@
#ifndef __ASM_X86_HVM_HVM_H__
#define __ASM_X86_HVM_HVM_H__
+#include <xen/mm.h>
+
#include <asm/alternative.h>
#include <asm/asm_defns.h>
#include <asm/current.h>
@@ -203,8 +205,7 @@ struct hvm_function_table {
/*Walk nested p2m */
int (*nhvm_hap_walk_L1_p2m)(struct vcpu *v, paddr_t L2_gpa,
paddr_t *L1_gpa, unsigned int *page_order,
- uint8_t *p2m_acc, bool_t access_r,
- bool_t access_w, bool_t access_x);
+ uint8_t *p2m_acc, struct npfec npfec);
void (*enable_msr_interception)(struct domain *d, uint32_t msr);
bool_t (*is_singlestep_supported)(void);
@@ -350,7 +351,6 @@ int hvm_debug_op(struct vcpu *v, int32_t op);
void hvm_toggle_singlestep(struct vcpu *v);
void hvm_fast_singlestep(struct vcpu *v, uint16_t p2midx);
-struct npfec;
int hvm_hap_nested_page_fault(paddr_t gpa, unsigned long gla,
struct npfec npfec);
@@ -631,6 +631,14 @@ static inline enum hvm_intblk
nhvm_interrupt_blocked(struct vcpu *v)
return hvm_funcs.nhvm_intr_blocked(v);
}
+static inline int nhvm_hap_walk_L1_p2m(
+ struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa, unsigned int *page_order,
+ uint8_t *p2m_acc, struct npfec npfec)
+{
+ return hvm_funcs.nhvm_hap_walk_L1_p2m(
+ v, L2_gpa, L1_gpa, page_order, p2m_acc, npfec);
+}
+
static inline void hvm_enable_msr_interception(struct domain *d, uint32_t msr)
{
hvm_funcs.enable_msr_interception(d, msr);
diff --git a/xen/arch/x86/include/asm/hvm/nestedhvm.h
b/xen/arch/x86/include/asm/hvm/nestedhvm.h
index d263925786..7184928c2b 100644
--- a/xen/arch/x86/include/asm/hvm/nestedhvm.h
+++ b/xen/arch/x86/include/asm/hvm/nestedhvm.h
@@ -58,11 +58,7 @@ bool_t nestedhvm_vcpu_in_guestmode(struct vcpu *v);
#define NESTEDHVM_PAGEFAULT_RETRY 5
#define NESTEDHVM_PAGEFAULT_DIRECT_MMIO 6
int nestedhvm_hap_nested_page_fault(struct vcpu *v, paddr_t *L2_gpa,
- bool_t access_r, bool_t access_w, bool_t access_x);
-
-int nestedhap_walk_L1_p2m(struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa,
- unsigned int *page_order, uint8_t *p2m_acc,
- bool_t access_r, bool_t access_w, bool_t access_x);
+ struct npfec npfec);
/* IO permission map */
unsigned long *nestedhvm_vcpu_iomap_get(bool_t ioport_80, bool_t ioport_ed);
diff --git a/xen/arch/x86/include/asm/hvm/svm/nestedsvm.h
b/xen/arch/x86/include/asm/hvm/svm/nestedsvm.h
index 0873698457..c3ef235414 100644
--- a/xen/arch/x86/include/asm/hvm/svm/nestedsvm.h
+++ b/xen/arch/x86/include/asm/hvm/svm/nestedsvm.h
@@ -122,9 +122,9 @@ enum hvm_intblk nsvm_intr_blocked(struct vcpu *v);
void svm_vmexit_do_clgi(struct cpu_user_regs *regs, struct vcpu *v);
void svm_vmexit_do_stgi(struct cpu_user_regs *regs, struct vcpu *v);
bool_t nestedsvm_gif_isset(struct vcpu *v);
-int nsvm_hap_walk_L1_p2m(struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa,
- unsigned int *page_order, uint8_t *p2m_acc,
- bool_t access_r, bool_t access_w, bool_t access_x);
+int nsvm_hap_walk_L1_p2m(
+ struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa, unsigned int *page_order,
+ uint8_t *p2m_acc, struct npfec npfec);
#define NSVM_INTR_NOTHANDLED 3
#define NSVM_INTR_NOTINTERCEPTED 2
diff --git a/xen/arch/x86/include/asm/hvm/vmx/vvmx.h
b/xen/arch/x86/include/asm/hvm/vmx/vvmx.h
index d5f68f30b1..e4ca3bc6ee 100644
--- a/xen/arch/x86/include/asm/hvm/vmx/vvmx.h
+++ b/xen/arch/x86/include/asm/hvm/vmx/vvmx.h
@@ -100,10 +100,10 @@ bool_t nvmx_ept_enabled(struct vcpu *v);
#define EPT_TRANSLATE_MISCONFIG 2
#define EPT_TRANSLATE_RETRY 3
-int
-nvmx_hap_walk_L1_p2m(struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa,
- unsigned int *page_order, uint8_t *p2m_acc,
- bool_t access_r, bool_t access_w, bool_t access_x);
+int nvmx_hap_walk_L1_p2m(
+ struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa, unsigned int *page_order,
+ uint8_t *p2m_acc, struct npfec npfec);
+
/*
* Virtual VMCS layout
*
diff --git a/xen/arch/x86/mm/hap/nested_hap.c b/xen/arch/x86/mm/hap/nested_hap.c
index 50fa2dd9f4..d8a7b3b401 100644
--- a/xen/arch/x86/mm/hap/nested_hap.c
+++ b/xen/arch/x86/mm/hap/nested_hap.c
@@ -113,31 +113,13 @@ nestedhap_fix_p2m(struct vcpu *v, struct p2m_domain *p2m,
}
}
-/* This function uses L2_gpa to walk the P2M page table in L1. If the
- * walk is successful, the translated value is returned in
- * L1_gpa. The result value tells what to do next.
- */
-int
-nestedhap_walk_L1_p2m(struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa,
- unsigned int *page_order, uint8_t *p2m_acc,
- bool_t access_r, bool_t access_w, bool_t access_x)
-{
- ASSERT(hvm_funcs.nhvm_hap_walk_L1_p2m);
-
- return hvm_funcs.nhvm_hap_walk_L1_p2m(v, L2_gpa, L1_gpa, page_order,
- p2m_acc, access_r, access_w, access_x);
-}
-
-
/* This function uses L1_gpa to walk the P2M table in L0 hypervisor. If the
* walk is successful, the translated value is returned in L0_gpa. The return
* value tells the upper level what to do.
*/
-static int
-nestedhap_walk_L0_p2m(struct p2m_domain *p2m, paddr_t L1_gpa, paddr_t *L0_gpa,
- p2m_type_t *p2mt, p2m_access_t *p2ma,
- unsigned int *page_order,
- bool_t access_r, bool_t access_w, bool_t access_x)
+static int nestedhap_walk_L0_p2m(
+ struct p2m_domain *p2m, paddr_t L1_gpa, paddr_t *L0_gpa, p2m_type_t *p2mt,
+ p2m_access_t *p2ma, unsigned int *page_order, struct npfec npfec)
{
mfn_t mfn;
int rc;
@@ -154,7 +136,7 @@ nestedhap_walk_L0_p2m(struct p2m_domain *p2m, paddr_t
L1_gpa, paddr_t *L0_gpa,
goto out;
rc = NESTEDHVM_PAGEFAULT_L0_ERROR;
- if ( access_w && p2m_is_readonly(*p2mt) )
+ if ( npfec.write_access && p2m_is_readonly(*p2mt) )
goto out;
if ( p2m_is_paging(*p2mt) || p2m_is_shared(*p2mt) || !p2m_is_ram(*p2mt) )
@@ -176,9 +158,8 @@ out:
*
* Returns:
*/
-int
-nestedhvm_hap_nested_page_fault(struct vcpu *v, paddr_t *L2_gpa,
- bool_t access_r, bool_t access_w, bool_t access_x)
+int nestedhvm_hap_nested_page_fault(
+ struct vcpu *v, paddr_t *L2_gpa, struct npfec npfec)
{
int rv;
paddr_t L1_gpa, L0_gpa;
@@ -192,8 +173,8 @@ nestedhvm_hap_nested_page_fault(struct vcpu *v, paddr_t
*L2_gpa,
p2m = p2m_get_hostp2m(d); /* L0 p2m */
/* walk the L1 P2M table */
- rv = nestedhap_walk_L1_p2m(v, *L2_gpa, &L1_gpa, &page_order_21, &p2ma_21,
- access_r, access_w, access_x);
+ rv = nhvm_hap_walk_L1_p2m(v, *L2_gpa, &L1_gpa, &page_order_21, &p2ma_21,
+ npfec);
/* let caller to handle these two cases */
switch (rv) {
@@ -209,9 +190,8 @@ nestedhvm_hap_nested_page_fault(struct vcpu *v, paddr_t
*L2_gpa,
}
/* ==> we have to walk L0 P2M */
- rv = nestedhap_walk_L0_p2m(p2m, L1_gpa, &L0_gpa,
- &p2mt_10, &p2ma_10, &page_order_10,
- access_r, access_w, access_x);
+ rv = nestedhap_walk_L0_p2m(p2m, L1_gpa, &L0_gpa, &p2mt_10, &p2ma_10,
+ &page_order_10, npfec);
/* let upper level caller to handle these two cases */
switch (rv) {
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 98c8201f92..3f81e99fd6 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1930,6 +1930,11 @@ unsigned long paging_gva_to_gfn(struct vcpu *v,
const struct paging_mode *mode;
uint8_t l1_p2ma;
unsigned int l1_page_order;
+ struct npfec npfec = {
+ .read_access = 1,
+ .write_access = *pfec & PFEC_write_access,
+ .insn_fetch = *pfec & PFEC_insn_fetch,
+ };
int rv;
/* translate l2 guest va into l2 guest gfn */
@@ -1940,11 +1945,8 @@ unsigned long paging_gva_to_gfn(struct vcpu *v,
if ( l2_gfn == gfn_x(INVALID_GFN) )
return gfn_x(INVALID_GFN);
- rv = nestedhap_walk_L1_p2m(v, pfn_to_paddr(l2_gfn), &l1_gpa,
- &l1_page_order, &l1_p2ma,
- 1,
- !!(*pfec & PFEC_write_access),
- !!(*pfec & PFEC_insn_fetch));
+ rv = nhvm_hap_walk_L1_p2m(
+ v, pfn_to_paddr(l2_gfn), &l1_gpa, &l1_page_order, &l1_p2ma, npfec);
if ( rv != NESTEDHVM_PAGEFAULT_DONE )
return gfn_x(INVALID_GFN);
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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