[PATCH v2 2/2] KVM: SVM: Use a separate vmcb for the nested L2 guest

From: Cathy Avery
Date: Sun Oct 11 2020 - 14:48:37 EST

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Next in thread: Sean Christopherson: "Re: [PATCH v2 2/2] KVM: SVM: Use a separate vmcb for the nested L2 guest"
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svm->vmcb will now point to either a separate vmcb L1 ( not nested ) or L2 vmcb ( nested ).

Issues:

1) There is some wholesale copying of vmcb.save and vmcb.contol
areas which will need to be refined.

Tested:
kvm-unit-tests
kvm self tests
Loaded fedora nested guest on fedora

Signed-off-by: Cathy Avery <cavery@xxxxxxxxxx>
---
arch/x86/kvm/svm/nested.c | 117 +++++++++++++++++---------------------
arch/x86/kvm/svm/svm.c | 42 +++++++-------
arch/x86/kvm/svm/svm.h | 49 +++++-----------
3 files changed, 89 insertions(+), 119 deletions(-)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index e90bc436f584..bcce92f0a90c 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -75,12 +75,12 @@ static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
- struct vmcb *hsave = svm->nested.hsave;

WARN_ON(mmu_is_nested(vcpu));

vcpu->arch.mmu = &vcpu->arch.guest_mmu;
- kvm_init_shadow_npt_mmu(vcpu, X86_CR0_PG, hsave->save.cr4, hsave->save.efer,
+ kvm_init_shadow_npt_mmu(vcpu, X86_CR0_PG, svm->vmcb01->save.cr4,
+ svm->vmcb01->save.efer,
svm->nested.ctl.nested_cr3);
vcpu->arch.mmu->get_guest_pgd = nested_svm_get_tdp_cr3;
vcpu->arch.mmu->get_pdptr = nested_svm_get_tdp_pdptr;
@@ -105,7 +105,7 @@ void recalc_intercepts(struct vcpu_svm *svm)
return;

c = &svm->vmcb->control;
- h = &svm->nested.hsave->control;
+ h = &svm->vmcb01->control;
g = &svm->nested.ctl;

svm->nested.host_intercept_exceptions = h->intercept_exceptions;
@@ -403,7 +403,7 @@ static void nested_prepare_vmcb_control(struct vcpu_svm *svm)

svm->vmcb->control.int_ctl =
(svm->nested.ctl.int_ctl & ~mask) |
- (svm->nested.hsave->control.int_ctl & mask);
+ (svm->vmcb01->control.int_ctl & mask);

svm->vmcb->control.virt_ext = svm->nested.ctl.virt_ext;
svm->vmcb->control.int_vector = svm->nested.ctl.int_vector;
@@ -432,6 +432,16 @@ int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
int ret;

svm->nested.vmcb = vmcb_gpa;
+
+ WARN_ON(svm->vmcb == svm->nested.vmcb02);
+
+ svm->nested.vmcb02->control = svm->vmcb01->control;
+ svm->nested.vmcb02->save.cr4 = svm->vmcb01->save.cr4;
+
+ nested_svm_vmloadsave(svm->vmcb01, svm->nested.vmcb02);
+
+ svm->vmcb = svm->nested.vmcb02;
+ svm->vmcb_pa = svm->nested.vmcb02_pa;
load_nested_vmcb_control(svm, &nested_vmcb->control);
nested_prepare_vmcb_save(svm, nested_vmcb);
nested_prepare_vmcb_control(svm);
@@ -450,8 +460,6 @@ int nested_svm_vmrun(struct vcpu_svm *svm)
{
int ret;
struct vmcb *nested_vmcb;
- struct vmcb *hsave = svm->nested.hsave;
- struct vmcb *vmcb = svm->vmcb;
struct kvm_host_map map;
u64 vmcb_gpa;

@@ -496,29 +504,14 @@ int nested_svm_vmrun(struct vcpu_svm *svm)
kvm_clear_exception_queue(&svm->vcpu);
kvm_clear_interrupt_queue(&svm->vcpu);

- /*
- * Save the old vmcb, so we don't need to pick what we save, but can
- * restore everything when a VMEXIT occurs
- */
- hsave->save.es = vmcb->save.es;
- hsave->save.cs = vmcb->save.cs;
- hsave->save.ss = vmcb->save.ss;
- hsave->save.ds = vmcb->save.ds;
- hsave->save.gdtr = vmcb->save.gdtr;
- hsave->save.idtr = vmcb->save.idtr;
- hsave->save.efer = svm->vcpu.arch.efer;
- hsave->save.cr0 = kvm_read_cr0(&svm->vcpu);
- hsave->save.cr4 = svm->vcpu.arch.cr4;
- hsave->save.rflags = kvm_get_rflags(&svm->vcpu);
- hsave->save.rip = kvm_rip_read(&svm->vcpu);
- hsave->save.rsp = vmcb->save.rsp;
- hsave->save.rax = vmcb->save.rax;
- if (npt_enabled)
- hsave->save.cr3 = vmcb->save.cr3;
- else
- hsave->save.cr3 = kvm_read_cr3(&svm->vcpu);
-
- copy_vmcb_control_area(&hsave->control, &vmcb->control);
+ svm->vmcb01->save.efer = svm->vcpu.arch.efer;
+ svm->vmcb01->save.cr0 = kvm_read_cr0(&svm->vcpu);
+ svm->vmcb01->save.cr4 = svm->vcpu.arch.cr4;
+ svm->vmcb01->save.rflags = kvm_get_rflags(&svm->vcpu);
+ svm->vmcb01->save.rip = kvm_rip_read(&svm->vcpu);
+
+ if (!npt_enabled)
+ svm->vmcb01->save.cr3 = kvm_read_cr3(&svm->vcpu);

svm->nested.nested_run_pending = 1;

@@ -564,7 +557,6 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
{
int rc;
struct vmcb *nested_vmcb;
- struct vmcb *hsave = svm->nested.hsave;
struct vmcb *vmcb = svm->vmcb;
struct kvm_host_map map;

@@ -628,8 +620,10 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
nested_vmcb->control.pause_filter_thresh =
svm->vmcb->control.pause_filter_thresh;

- /* Restore the original control entries */
- copy_vmcb_control_area(&vmcb->control, &hsave->control);
+ nested_svm_vmloadsave(svm->nested.vmcb02, svm->vmcb01);
+
+ svm->vmcb = svm->vmcb01;
+ svm->vmcb_pa = svm->vmcb01_pa;

/* On vmexit the GIF is set to false */
svm_set_gif(svm, false);
@@ -640,19 +634,13 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
svm->nested.ctl.nested_cr3 = 0;

/* Restore selected save entries */
- svm->vmcb->save.es = hsave->save.es;
- svm->vmcb->save.cs = hsave->save.cs;
- svm->vmcb->save.ss = hsave->save.ss;
- svm->vmcb->save.ds = hsave->save.ds;
- svm->vmcb->save.gdtr = hsave->save.gdtr;
- svm->vmcb->save.idtr = hsave->save.idtr;
- kvm_set_rflags(&svm->vcpu, hsave->save.rflags);
- svm_set_efer(&svm->vcpu, hsave->save.efer);
- svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE);
- svm_set_cr4(&svm->vcpu, hsave->save.cr4);
- kvm_rax_write(&svm->vcpu, hsave->save.rax);
- kvm_rsp_write(&svm->vcpu, hsave->save.rsp);
- kvm_rip_write(&svm->vcpu, hsave->save.rip);
+ kvm_set_rflags(&svm->vcpu, svm->vmcb->save.rflags);
+ svm_set_efer(&svm->vcpu, svm->vmcb->save.efer);
+ svm_set_cr0(&svm->vcpu, svm->vmcb->save.cr0 | X86_CR0_PE);
+ svm_set_cr4(&svm->vcpu, svm->vmcb->save.cr4);
+ kvm_rax_write(&svm->vcpu, svm->vmcb->save.rax);
+ kvm_rsp_write(&svm->vcpu, svm->vmcb->save.rsp);
+ kvm_rip_write(&svm->vcpu, svm->vmcb->save.rip);
svm->vmcb->save.dr7 = 0;
svm->vmcb->save.cpl = 0;
svm->vmcb->control.exit_int_info = 0;
@@ -670,13 +658,10 @@ int nested_svm_vmexit(struct vcpu_svm *svm)

nested_svm_uninit_mmu_context(&svm->vcpu);

- rc = nested_svm_load_cr3(&svm->vcpu, hsave->save.cr3, false);
+ rc = nested_svm_load_cr3(&svm->vcpu, svm->vmcb->save.cr3, false);
if (rc)
return 1;

- if (npt_enabled)
- svm->vmcb->save.cr3 = hsave->save.cr3;
-
/*
* Drop what we picked up for L2 via svm_complete_interrupts() so it
* doesn't end up in L1.
@@ -694,12 +679,10 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
void svm_leave_nested(struct vcpu_svm *svm)
{
if (is_guest_mode(&svm->vcpu)) {
- struct vmcb *hsave = svm->nested.hsave;
- struct vmcb *vmcb = svm->vmcb;
-
svm->nested.nested_run_pending = 0;
leave_guest_mode(&svm->vcpu);
- copy_vmcb_control_area(&vmcb->control, &hsave->control);
+ svm->vmcb = svm->vmcb01;
+ svm->vmcb_pa = svm->vmcb01_pa;
nested_svm_uninit_mmu_context(&svm->vcpu);
}
}
@@ -982,7 +965,7 @@ int nested_svm_exit_special(struct vcpu_svm *svm)
case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);

- if (get_host_vmcb(svm)->control.intercept_exceptions & excp_bits)
+ if (svm->vmcb01->control.intercept_exceptions & excp_bits)
return NESTED_EXIT_HOST;
else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR &&
svm->vcpu.arch.apf.host_apf_flags)
@@ -1046,10 +1029,9 @@ static int svm_get_nested_state(struct kvm_vcpu *vcpu,
if (copy_to_user(&user_vmcb->control, &svm->nested.ctl,
sizeof(user_vmcb->control)))
return -EFAULT;
- if (copy_to_user(&user_vmcb->save, &svm->nested.hsave->save,
+ if (copy_to_user(&user_vmcb->save, &svm->vmcb01->save,
sizeof(user_vmcb->save)))
return -EFAULT;
-
out:
return kvm_state.size;
}
@@ -1059,7 +1041,6 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
struct kvm_nested_state *kvm_state)
{
struct vcpu_svm *svm = to_svm(vcpu);
- struct vmcb *hsave = svm->nested.hsave;
struct vmcb __user *user_vmcb = (struct vmcb __user *)
&user_kvm_nested_state->data.svm[0];
struct vmcb_control_area ctl;
@@ -1121,16 +1102,24 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
if (!(save.cr0 & X86_CR0_PG))
return -EINVAL;

+ svm->nested.vmcb02->control = svm->vmcb01->control;
+ svm->nested.vmcb02->save = svm->vmcb01->save;
+ svm->vmcb01->save = save;
+
+ WARN_ON(svm->vmcb == svm->nested.vmcb02);
+
+ svm->nested.vmcb = kvm_state->hdr.svm.vmcb_pa;
+
+ svm->vmcb = svm->nested.vmcb02;
+ svm->vmcb_pa = svm->nested.vmcb02_pa;
+
/*
- * All checks done, we can enter guest mode. L1 control fields
- * come from the nested save state. Guest state is already
- * in the registers, the save area of the nested state instead
- * contains saved L1 state.
+ * All checks done, we can enter guest mode. L2 control fields will
+ * be the result of a combination of L1 and userspace indicated
+ * L12.control. The save area of L1 vmcb now contains the userspace
+ * indicated L1.save.
*/
- copy_vmcb_control_area(&hsave->control, &svm->vmcb->control);
- hsave->save = save;

- svm->nested.vmcb = kvm_state->hdr.svm.vmcb_pa;
load_nested_vmcb_control(svm, &ctl);
nested_prepare_vmcb_control(svm);

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 619980a5d540..d7e46d9f666d 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -971,8 +971,8 @@ static u64 svm_write_l1_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
if (is_guest_mode(vcpu)) {
/* Write L1's TSC offset. */
g_tsc_offset = svm->vmcb->control.tsc_offset -
- svm->nested.hsave->control.tsc_offset;
- svm->nested.hsave->control.tsc_offset = offset;
+ svm->vmcb01->control.tsc_offset;
+ svm->vmcb01->control.tsc_offset = offset;
}

trace_kvm_write_tsc_offset(vcpu->vcpu_id,
@@ -1097,6 +1097,7 @@ static void init_vmcb(struct vcpu_svm *svm)
clr_cr_intercept(svm, INTERCEPT_CR3_READ);
clr_cr_intercept(svm, INTERCEPT_CR3_WRITE);
save->g_pat = svm->vcpu.arch.pat;
+ svm->nested.vmcb02->save.g_pat = svm->vcpu.arch.pat;
save->cr3 = 0;
save->cr4 = 0;
}
@@ -1172,9 +1173,9 @@ static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
static int svm_create_vcpu(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm;
- struct page *page;
+ struct page *vmcb01_page;
+ struct page *vmcb02_page;
struct page *msrpm_pages;
- struct page *hsave_page;
struct page *nested_msrpm_pages;
int err;

@@ -1182,8 +1183,8 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
svm = to_svm(vcpu);

err = -ENOMEM;
- page = alloc_page(GFP_KERNEL_ACCOUNT);
- if (!page)
+ vmcb01_page = alloc_page(GFP_KERNEL_ACCOUNT);
+ if (!vmcb01_page)
goto out;

msrpm_pages = alloc_pages(GFP_KERNEL_ACCOUNT, MSRPM_ALLOC_ORDER);
@@ -1194,8 +1195,8 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
if (!nested_msrpm_pages)
goto free_page2;

- hsave_page = alloc_page(GFP_KERNEL_ACCOUNT);
- if (!hsave_page)
+ vmcb02_page = alloc_page(GFP_KERNEL_ACCOUNT);
+ if (!vmcb02_page)
goto free_page3;

err = avic_init_vcpu(svm);
@@ -1208,8 +1209,9 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
if (irqchip_in_kernel(vcpu->kvm) && kvm_apicv_activated(vcpu->kvm))
svm->avic_is_running = true;

- svm->nested.hsave = page_address(hsave_page);
- clear_page(svm->nested.hsave);
+ svm->nested.vmcb02 = page_address(vmcb02_page);
+ clear_page(svm->nested.vmcb02);
+ svm->nested.vmcb02_pa = __sme_set(page_to_pfn(vmcb02_page) << PAGE_SHIFT);

svm->msrpm = page_address(msrpm_pages);
svm_vcpu_init_msrpm(svm->msrpm);
@@ -1217,9 +1219,11 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
svm->nested.msrpm = page_address(nested_msrpm_pages);
svm_vcpu_init_msrpm(svm->nested.msrpm);

- svm->vmcb = page_address(page);
+ svm->vmcb = svm->vmcb01 = page_address(vmcb01_page);
clear_page(svm->vmcb);
- svm->vmcb_pa = __sme_set(page_to_pfn(page) << PAGE_SHIFT);
+ svm->vmcb_pa = __sme_set(page_to_pfn(vmcb01_page) << PAGE_SHIFT);
+ svm->vmcb01_pa = svm->vmcb_pa;
+
svm->asid_generation = 0;
init_vmcb(svm);

@@ -1229,13 +1233,13 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
return 0;

free_page4:
- __free_page(hsave_page);
+ __free_page(vmcb02_page);
free_page3:
__free_pages(nested_msrpm_pages, MSRPM_ALLOC_ORDER);
free_page2:
__free_pages(msrpm_pages, MSRPM_ALLOC_ORDER);
free_page1:
- __free_page(page);
+ __free_page(vmcb01_page);
out:
return err;
}
@@ -1257,11 +1261,11 @@ static void svm_free_vcpu(struct kvm_vcpu *vcpu)
* svm_vcpu_load(). So, ensure that no logical CPU has this
* vmcb page recorded as its current vmcb.
*/
- svm_clear_current_vmcb(svm->vmcb);

- __free_page(pfn_to_page(__sme_clr(svm->vmcb_pa) >> PAGE_SHIFT));
+ svm_clear_current_vmcb(svm->vmcb);
+ __free_page(pfn_to_page(__sme_clr(svm->vmcb01_pa) >> PAGE_SHIFT));
+ __free_page(pfn_to_page(__sme_clr(svm->nested.vmcb02_pa) >> PAGE_SHIFT));
__free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
- __free_page(virt_to_page(svm->nested.hsave));
__free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
}

@@ -1394,7 +1398,7 @@ static void svm_clear_vintr(struct vcpu_svm *svm)
/* Drop int_ctl fields related to VINTR injection. */
svm->vmcb->control.int_ctl &= mask;
if (is_guest_mode(&svm->vcpu)) {
- svm->nested.hsave->control.int_ctl &= mask;
+ svm->vmcb01->control.int_ctl &= mask;

WARN_ON((svm->vmcb->control.int_ctl & V_TPR_MASK) !=
(svm->nested.ctl.int_ctl & V_TPR_MASK));
@@ -3134,7 +3138,7 @@ bool svm_interrupt_blocked(struct kvm_vcpu *vcpu)
if (is_guest_mode(vcpu)) {
/* As long as interrupts are being delivered... */
if ((svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK)
- ? !(svm->nested.hsave->save.rflags & X86_EFLAGS_IF)
+ ? !(svm->vmcb01->save.rflags & X86_EFLAGS_IF)
: !(kvm_get_rflags(vcpu) & X86_EFLAGS_IF))
return true;

diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 862f0d2405e8..1a4af5bd10b3 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -82,7 +82,8 @@ struct kvm_svm {
struct kvm_vcpu;

struct svm_nested_state {
- struct vmcb *hsave;
+ struct vmcb *vmcb02;
+ unsigned long vmcb02_pa;
u64 hsave_msr;
u64 vm_cr_msr;
u64 vmcb;
@@ -103,6 +104,8 @@ struct vcpu_svm {
struct kvm_vcpu vcpu;
struct vmcb *vmcb;
unsigned long vmcb_pa;
+ struct vmcb *vmcb01;
+ unsigned long vmcb01_pa;
struct svm_cpu_data *svm_data;
u32 asid;
uint64_t asid_generation;
@@ -207,44 +210,28 @@ static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
return container_of(vcpu, struct vcpu_svm, vcpu);
}

-static inline struct vmcb *get_host_vmcb(struct vcpu_svm *svm)
-{
- if (is_guest_mode(&svm->vcpu))
- return svm->nested.hsave;
- else
- return svm->vmcb;
-}
-
static inline void set_cr_intercept(struct vcpu_svm *svm, int bit)
{
- struct vmcb *vmcb = get_host_vmcb(svm);
-
- vmcb->control.intercept_cr |= (1U << bit);
+ svm->vmcb01->control.intercept_cr |= (1U << bit);

recalc_intercepts(svm);
}

static inline void clr_cr_intercept(struct vcpu_svm *svm, int bit)
{
- struct vmcb *vmcb = get_host_vmcb(svm);
-
- vmcb->control.intercept_cr &= ~(1U << bit);
+ svm->vmcb01->control.intercept_cr &= ~(1U << bit);

recalc_intercepts(svm);
}

static inline bool is_cr_intercept(struct vcpu_svm *svm, int bit)
{
- struct vmcb *vmcb = get_host_vmcb(svm);
-
- return vmcb->control.intercept_cr & (1U << bit);
+ return svm->vmcb01->control.intercept_cr & (1U << bit);
}

static inline void set_dr_intercepts(struct vcpu_svm *svm)
{
- struct vmcb *vmcb = get_host_vmcb(svm);
-
- vmcb->control.intercept_dr = (1 << INTERCEPT_DR0_READ)
+ svm->vmcb01->control.intercept_dr = (1 << INTERCEPT_DR0_READ)
| (1 << INTERCEPT_DR1_READ)
| (1 << INTERCEPT_DR2_READ)
| (1 << INTERCEPT_DR3_READ)
@@ -266,45 +253,35 @@ static inline void set_dr_intercepts(struct vcpu_svm *svm)

static inline void clr_dr_intercepts(struct vcpu_svm *svm)
{
- struct vmcb *vmcb = get_host_vmcb(svm);
-
- vmcb->control.intercept_dr = 0;
+ svm->vmcb01->control.intercept_dr = 0;

recalc_intercepts(svm);
}

static inline void set_exception_intercept(struct vcpu_svm *svm, int bit)
{
- struct vmcb *vmcb = get_host_vmcb(svm);
-
- vmcb->control.intercept_exceptions |= (1U << bit);
+ svm->vmcb01->control.intercept_exceptions |= (1U << bit);

recalc_intercepts(svm);
}

static inline void clr_exception_intercept(struct vcpu_svm *svm, int bit)
{
- struct vmcb *vmcb = get_host_vmcb(svm);
-
- vmcb->control.intercept_exceptions &= ~(1U << bit);
+ svm->vmcb01->control.intercept_exceptions &= ~(1U << bit);

recalc_intercepts(svm);
}

static inline void svm_set_intercept(struct vcpu_svm *svm, int bit)
{
- struct vmcb *vmcb = get_host_vmcb(svm);
-
- vmcb->control.intercept |= (1ULL << bit);
+ svm->vmcb01->control.intercept |= (1ULL << bit);

recalc_intercepts(svm);
}

static inline void svm_clr_intercept(struct vcpu_svm *svm, int bit)
{
- struct vmcb *vmcb = get_host_vmcb(svm);
-
- vmcb->control.intercept &= ~(1ULL << bit);
+ svm->vmcb01->control.intercept &= ~(1ULL << bit);

recalc_intercepts(svm);
}
--
2.20.1

Next message: Cathy Avery: "[PATCH v2 1/2] KVM: SVM: Move asid to vcpu_svm"
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In reply to: Cathy Avery: "[PATCH v2 0/2] KVM: SVM: Create separate vmcbs for L1 and L2"
Next in thread: Sean Christopherson: "Re: [PATCH v2 2/2] KVM: SVM: Use a separate vmcb for the nested L2 guest"
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